Weblogic Tutorials | Weblogic tutorial for Beginners

1. Question: Can an Application Use Java Security?

Answer: Web security can be defined in various ways, depending on individual points of view. The main focus of security in this article is the safety of applications developed and deployed for the Internet. Here, I will outline some software security measures that you can take to secure your application. While none of them is completely infallible, combining these approaches with hardware can help prevent malicious attacks on your business.

The two main concepts of security are authentication and authorization. I will describe each of them in the following sections and provide examples of how you can implement them in your applications. In addition, I will discuss some key classes of the Java Security API to prepare for a more detailed example that combines form-based authentication with Java’s security model. The concepts outlined in the example should enable your enterprise to produce a security policy for your Java-based applications.

2. Question: Can I Run the Configuration Wizard Outside the Installer?

Answer: Yes. You can start the Configuration Wizard from the Start menu or using a script in the utils directory. See Creating Domains and Servers in Configuring and Managing WebLogic Server.

3. Question: Can I Start a Managed Server if the Administration Server is Unavailable?

Answer: By default, if a Managed Server is unable to connect to the specified Administration Server during startup, it can retrieve its configuration by reading a configuration file and other files directly. You cannot change the server’s configuration until the Administration Server is available. A Managed Server that starts in this way is running in Managed Server Independence mode.

4. Question: Can You Explain About Bea Guardian?

Answer: Guardian is a diagnostic tool for identifying potential problems in your environment before they occur, and provides specific instructions for resolving them. Guardian is like having the entire Oracle Customer Support Team scrutinize your domain and immediately present their findings and recommendations to you, at your convenience.

Guardian can run on Windows or Linux systems that have Java Version 5 or higher installed. Guardian can evaluate any platform based on WebLogic Server version 8.1 through 10.3, regardless of the operating system on which it is running.

To use the Guardian, you must first activate one or more Domains in the Guardian. A domain is a logically related group of WebLogic Server resources that you manage as a unit. Activating a domain enables it for Guardian evaluation. You can also organize multiple domains into Domain Groups. Then, select one or more domains, select a Signature Bundle, and launch an Evaluation. Guardian then proceeds to evaluate the Signature Bundle against the specified domain(s) and generates a detailed report of potential issues and their remedies. You can then review the report and decide how to proceed.

For a description of fundamental Guardian concepts, see Key Concepts on page 21. For a description of and instructions for basic Guardian tasks, see Basic Tasks on page 38 in Tasks.

5. Question: Can You Give the Deployer Utility Syntax?

Answer: java WebLogic.Deployer [options] [-deploy|-redeploy|-undeploy|-start|-stop|-listapps] [file(s)]
Weblogic. Deployer used to perform various deployment tasks
1. Deploy an application: we can deploy an application by using WebLogic.Deployer utility. To deploy a new application:
Java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic -name app –source /myapp/app.ear –targets server1,server2 –deploy
2. Redeploy an application: WebLogic.Deployer allows us to redeploy an entire application or a part of the application.
To redeploy an application:
java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –name app –redeploy
To redeploy a part of the application:
java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –targets server1,server2
–redeploy jsps/*.jsp
3.Undeploy an application: Utility allows you to undeploy an application.
To undeploy an application:
Java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –name app –undeploy
targets –server1,server2
4. Listing deployment applications and tasks: Deployer utility can list all deployed applications and tasks.
To list all deployed applications:
Java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –list apps
To list all deployment tasks:
Java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –list task
4.cancel a deployment task: You can cancel a deployment task using Deployer utility.
To cancel a deployment task:
java WebLogic.Deployer –admin URL t3://localhost:7001 –username system –password WebLogic –cancel id tag.

6. Question: Deployment Steps Using Admin Console?

Answer: The deployment procedures below are for using Weblogic 9.1. The procedures for using different versions may vary.

In Manager, locate the existing Web application on the Applications page.

Check the box next to the Web application you want to deploy to Tomcat and hit the ‘Export’ button.

In the File Download dialog that appears, click the Save button.

In the ‘Save as type:’ section, choose All Files.

The default filename extension will be .zip. Change this to .war and save it to the file system. Click the ‘Close’ button when Save is complete.

Click the ‘Start the Administration Console’ button to open the Administration Console.

In the Change Center section of the console, click the ‘Lock and Edit’ button to open the server instance for changes.

In the Domain Structure section of the console, find the ‘Deployments’ link and click on it.

You will see a Summary of Deployments. Here is where you will deploy the war file. Find and click the ‘Install’ button.

Browse to the location on your file system where the .war file was saved. Click the radio button next to the .war file and click ‘Next’

You want to deploy this module as an application. For the targeting style, make sure ‘Install this deployment as an application’ is selected. Click ‘Next’.

Click ‘Next’ again to accept the defaults in this next pane, then click ‘Finish’.

You will now get a summary list of the settings for the deployment. Click the ‘Save’ button. If everything went ok, you will see a message in green that says ‘Settings updated successfully.’

Back in the Change Center section of the console, click the green ‘Activate Changes’ button. The application has been ‘prepared’, but not yet deployed at this point.

Back in the Domain Structure section of the console, find and click on the ‘Deployments’ link. In the Summary of Deployments, find your application, check the box next to it and click the ‘Start’ button. Select ‘Servicing all requests’. Click Yes to continue.

If the state of your deployment says ‘Active’, you have successfully deployed your Web application to Weblogic.

7. Question: Difference Between Web Server and Application Server?

Answer:

Web server:

A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respond with a static HTML page or image, send a redirect, or delegate the dynamic response generation to some other program such as CGI scripts, JSPs (JavaServer Pages), servlets, ASPs (Active Server Pages), server-side JavaScripts, or some other server-side technology. Whatever their purpose, such server-side programs generate a response, most often in HTML, for viewing in a Web browser.

Understand that a Web server’s delegation model is fairly simple. When a request comes into the Web server, the Web server simply passes the request to the program best able to handle it. The Web server doesn’t provide any functionality beyond simply providing an environment in which the server-side program can execute and pass back the generated responses. The server-side program usually provides for itself such functions as transaction processing, database connectivity, and messaging.

While a Web server may not itself support transactions or database connection pooling, it may employ various strategies for fault tolerance and scalability such as load balancing, caching, and clustering—features oftentimes erroneously assigned as features reserved only for application servers.

Application server:

As for the application server, according to our definition, an application server exposes business logic to client applications through various protocols, possibly including HTTP. While a Web server mainly deals with sending HTML for display in a Web browser, an application server provides access to business logic for use by client application programs. The application program can use this logic just as it would call a method on an object (or a function in the procedural world).

Such application server clients can include GUIs (graphical user interface) running on a PC, a Web server, or even other application servers. The information traveling back and forth between an application server and its client is not restricted to simple display markup. Instead, the information is program logic. Since the logic takes the form of data and method calls and not static HTML, the client can employ the exposed business logic however it wants.

In most cases, the server exposes this business logic through a component API, such as the EJB (Enterprise JavaBean) component model found on J2EE (Java 2 Platform, Enterprise Edition) application servers. Moreover, the application server manages its own resources. Such gate-keeping duties include security, transaction processing, resource pooling, and messaging. Like a Web server, an application server may also employ various scalability and fault-tolerance techniques.

8. Question: Do I Need to Use the WLS T3 Protocol?
Answer:

The server instance for which you configure the T3 protocol does not need to be running. If it is running, all modifications to the T3 protocol settings take effect immediately.
T3 provides a framework for WebLogic Server messages that support for enhancements. These enhancements include abbreviations and features, such as object replacement, that work in the context of WebLogic Server clusters and HTTP and another product tunneling.
T3 predates Java Object Serialization and RMI, while closely tracking and leveraging these specifications. T3 is a superset of Java Object. Serialization or RMI; anything you can do in Java Object Serialization and RMI can be done over T3.
T3 is mandated between WebLogic Servers and between programmatic clients and a WebLogic Server cluster. HTTP and IIOP are optional protocols that can be used to communicate between other processes and WebLogic Server. It depends on what you want to do.
For example: when you want to communicate between a browser and WebLogic Server — use HTTP, or an ORB and WebLogic Server-IIOP.

T3 is BEA’s proprietary protocol. To configure the T3 protocol:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit.
2. In the Administration Console, expand Environment and select Servers.
3. On the Servers page, click on the server name.
4. Select Protocols > General.
5. Modify the values for Complete Message Timeout and Maximum Message Size. Note: These settings apply to all protocols in the server’s default network configuration.
6. To enable tunneling of connections, click Enable Tunneling and provide values for Tunneling Client Ping and Tunneling Client Timeout. Note: These settings apply to all protocols in the server’s default network configuration that support tunneling.
7. Click Save.
8. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
Not all changes take effect immediately—some require a restart.

9. Question: Does the Plug-in Support Two-Way SSL?

Answer: You can establish a secure connection between a IBM® Security Identity Manager plug-in and the IBM Security Identity Manager server. You must configure the plug-in and the server to use the Secure Sockets Layer (SSL) authentication.

The IBM Security Password Synchronization plug-in sends sensitive password information over the network to the IBM Security Identity Manager server. For this reason, a Secure Sockets Layer (SSL) connection is required to communicate with the IBM Security Identity Manager server.

When configuring certificates for an SSL connection, there are two levels of validation. One-way SSL is achieved by the server that sends you its certificate and the software that verifies it is signed by a trusted Certificate Authority (CA). For additional security, the server can enforce two-way SSL and also request that the client provide a certificate to the server. It is validated the same way by ensuring it is signed by a trusted CA.

For additional security, the IBM Security Identity Manager server can be configured to also request a certificate from the plug-in. This works the same as the server certificate, only in reverse. You must install a user certificate in the local certificate store and the CA certificate must be installed in the trust store on the IBM Security Identity Manager server. The extra security allows the IBM Security Identity Manager server to verify the source of the password change notification.

10. Question: Explain About your wls Environment in your Company How to Answer This Question?

Answer: WebLogic Server includes a security architecture that provides a unique and secure foundation for applications that are available via the Web. By taking advantage of the security features in WebLogic Server, enterprises benefit from a comprehensive, flexible security infrastructure designed to address the security challenges of making applications available on the Web. WebLogic security can be used standalone to secure WebLogic Server applications or as part of an enterprise-wide, security management system that represents a best-in-breed, security management solution.

The key features of the WebLogic Security Service include:

A comprehensive and standards-based design.
End-to-end security for WebLogic Server-hosted applications, from the mainframe to the Web browser.
Legacy security schemes that integrate with WebLogic Server security, allowing companies to leverage existing investments.
Security tools that are integrated into a flexible, unified system to ease security management across the enterprise.
Easy customization of application security to business requirements through mapping of company business rules to security policies.
A consistent model for applying security policies to Java EE and application-defined resources.
Easy updates to security policies. This release includes usability enhancements to the process of creating security policies as well as additional expressions that control access to WebLogic resources.
Easy adaptability for customized security solutions.
A modularized architecture, so that security infrastructure can change over time to meet the requirements of a particular company.
Support for configuring multiple security providers, as part of a transition scheme or upgrade path.
A separation between security details and application infrastructure, making security easier to deploy, manage, maintain, and modify as requirements change.
Default WebLogic security providers that provide you with a working security scheme out of the box. This release supports additional authentication stores such as databases and gives the option to configure an external RDBMS system as a datastore to be used by select security providers.
Customization of security schemes using custom security providers.
Unified management of security rules, security policies, and security providers through the WebLogic Server Administration Console.
Support for standard Java EE security technologies such as the Java Authentication and Authorization Service (JAAS), Java Secure Sockets Extensions (JSSE), Java Cryptography Extensions (JCE), and Java Authorization Contract for Containers (JACC).
A foundation for Web services security including support for Security Assertion Markup Language (SAML) 1.1 and 2.0.
Capabilities which allow WebLogic Server to participate in single sign-on (SSO) with Web sites, Web applications, and desktop clients
A framework for managing public keys which includes a certificate lookup, verification, validation, and revocation as well as a certificate registry.

11. Question: Explain the Methods For Providing User Credentials For Starting the Server?

Answer: At the time of the creation of domain, the wizard for setting configuration asks for details like user name, password, etc. from the user who is logging in for the first time as an administrator. If the domain is created in development mode, the configuration wizard saves the encrypted password as well as the username inside an identity file. This file is available for reference during the time of booting so that in the absence of this file, the system can prompt the user for the purpose of entering credentials. A new boot – identity file can be created if you want to change the user credentials or else if you are having the requirement of creating a domain in the production model.

12. Question: How Administration Server and Managed Servers Will Interact?

Answer:
The Administration Server stores the master copy of the domain configuration, including the configuration for all Managed Servers in the domain.

Each Managed Server stores a local copy of the domain configuration file.
When a Managed Server starts, it connects to the Administration Server to synchronize the configuration.

When the configuration is changed, the Administration Server sends the changed configuration to the Managed Servers.

13. Question: How Are Notifications Made When a Server is Added to a Cluster?
Answer: The WebLogic Server cluster broadcasts the availability of a new server instance each time a new instance joins the cluster. Cluster-aware stubs also periodically update their list of available server instances.

14. Question: How Can Cluster Communication Occur?
Answer: Network communication between WebLogic Servers within a cluster is serviced by IP Multicast for all one-to-many broadcast type communications and IP sockets for all peer-to-peer messages and data transfers. The following sections describe how WebLogic Server uses these communication types.

15. Question: How Can I Tell If a Database is Unavailable?
Answer: Database Unavailable means Textpattern is unable to connect to the SQL database. This can happen occasionally on some shared/virtual hosting servers when another user hogs all the available database resources. If it happens regularly, ask your hosting company whether there’s something they can do to fix the problem. (E Learning Portal)
A 500 Internal Server error could mean any number of things, from a server misconfiguration to a major crash. Occasional intermittent 500 errors can happen on shared/virtual hosting servers when another user hogs all the available memory, CGI processes, or some other limited server resource. Again, talk to your hosting company if it happens regularly.
If you’re seeing Database Unavailable or 500 Internal Server errors on every page view, without exception, then the problem is most likely a database server crash or a misconfiguration. In some cases, we’ve seen hosting companies change important database or server settings without informing their customers first.
If this is the case, check the settings in your Textpattern config.php file and make sure you can connect to the database using those settings in phpMyAdmin or similar. If the database server is working, check your .htaccess file, and consider temporarily disabling it. If problems persist, talk to your hosting company.

16. Question: How Do You Provide Load Balancing?

Answer: In computing, load balancing improves the distribution of workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units, or disk drives. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any single resource. Using multiple components with load balancing instead of a single component may increase reliability and availability through redundancy. Load balancing usually involves dedicated software or hardware, such as a multilayer switch or a Domain Name System server process.

Load balancing differs from channel bonding in that load balancing divides traffic between network interfaces on a network socket (OSI model layer 4) basis, while channel bonding implies a division of traffic between physical interfaces at a lower level, either per packet (OSI model Layer 3) or on a data link (OSI model Layer 2) basis with a protocol like shortest path bridging.

17. Question: How Do You Take Backup of Existing Domain?

Answer: Recovery from the failure of a server instance requires access to the domain’s configuration and security data. WebLogic Network Gatekeeper can be configured to perform certain domain backups automatically. The administrator must also perform a manual backup of the domain configuration artifacts and store those backups outside of the actual domain directory.

By default, the Administration Server stores a domain’s primary configuration data in a file called domain_name/config/config.xml, where domain_name is the root directory of the domain. The primary configuration file may reference additional configuration files for specific WebLogic Server services, such as JDBC and JMS. The configuration for specific services are stored in additional XML files in subdirectories of the domain_name/config directory, such as domain_name/config/jms and domain_name/config/jdbc.

The Administration Server can automatically archive multiple versions of the domain configuration (the entire domain-name/config directory). The configuration archives can be used for system restoration in cases where accidental configuration changes need to be reversed. For example, if an administrator accidentally removes a configured resource, the prior configuration can be restored by using the last automated backup.

The Administration Server stores a finite number of automated backups locally in domain-name\config. For this reason, automated domain backups are limited in their ability to guard against data corruption, such as a failed hard disk. Automated backups also do not preserve certain configuration data that are required for full domain restoration, such as LDAP repository data and server start-up scripts. BEA recommends that you also maintain multiple backup copies of the configuration and security offline, in a source control system.

18. Question: How Managed Servers Will Communicate in Cluster?

Answer: WebLogic Server instances in a cluster communicate with one another using two basic network technologies:

IP sockets, which are the conduits for peer-to-peer communication between clustered server instances.

IP unicast or multicast, which server instances use to broadcast the availability of services and heartbeats that indicate continued availability.

Note: When creating a new cluster, it is recommended that you use unicast for messaging within a cluster. For backward compatibility with previous versions, WebLogic Server you must use multicast for communications between clusters.

The way in which WebLogic Server uses IP multicast or unicast and socket communication affects the way you configure your cluster.

19. Question: How Many Connection Pool in Connection?

Answer: In software engineering, a connection pool is a cache of database connections maintained so that the connections can be reused when future requests to the database are required.[citation needed] Connection pools are used to enhance the performance of executing commands on a database. Opening and maintaining a database connection for each user especially requests made to a dynamic database-driven website application is costly and wastes resources. In connection pooling, after a connection is created, it is placed in the pool and it is used again so that a new connection does not have to be established. If all the connections are being used, a new connection is made and is added to the pool. Connection pooling also cuts down on the amount of time a user must wait to establish a connection to the database.

Contents:

1. Applications

2. Database support

3. See also

4. References

20. Question: How to Change From Default JVM to Other?

Answer: For changing the JVM can be done by following the steps below.

1. You should first set the JAVA_HOME in the start script of the server.

2. Change the config.xml of the domain for using the JRockit javac.exe

3. Remove any kind of switches specific to Sun JVM from start scripts of the server.

21. Question: How to Check the Version of Java?

Answer: Multiple copies of Java can be installed on a single computer, and, if you have more than one browser, every one of them could be using a different version or none at all. You can determine your Java version by verifying it on the Java website, or you could check using the Windows command prompt, Mac terminal, or Linux terminal.

Checking the Java version in Windows:

From the Windows Control Panel

1. Click Start > Control Panel > Java.
2. On the Java tab, click View to display a list of all the installed Java versions. You can enable and disable Java versions from this window.

From a command prompt:

1. Open a command prompt (Click to Start > Run, and then type cmd).
2. Type java -version.
3. The Java version and related information displays. For example:
C:\Users\Authorized User>java -version
java version “1.7.0_15”
Java(TM) SE Runtime Environment (build 1.7.0_05-b06)
Java HotSpot(TM) Client VM (build 23.1-b03, mixed mode, sharing)

Checking the Java version in Mac:

From the Java Control Panel

1. From the Apple, menu clicks System Preferences > Java.
2. On the General tab of the Java Control Panel, click About.
You can also review installed Java versions by clicking View on the Java tab.

From Terminal:

While it is possible to investigate your Mac Java version from Terminal, we find that if Oracle Java 1.7 is installed, the information returned is not accurate.

1. Open Terminal (Navigate to Applications > Utilities > Terminal))
2. Type java -version.
3. The Java version and related information displays. For example:
Users-MacBook-Pro:~ user$ java -version
java version “1.6.0_51″Java(TM) SE Runtime Environment (build 1.6.0_51-b11-457-11M4509)
Java HotSpot(TM) 64-Bit Server VM (build 20.51-b01-457, mixed mode)

Checking the Java version in Linux:

1. Open Terminal (this can be different depending on which version of Linux you are running. For example, in Ubuntu, navigate to Applications > Accessories > Terminal). In Red Hat, right-click the desktop, and select Open in Terminal from the pull-down menu.
2. Type java -version
3. The Java version and related information displays. For example:
user@user-desktop:~$ java -version
java version “1.7.0_15″Java(TM) SE Runtime Environment (build 1.7.0_05-b06)
Java HotSpot(TM) Client VM (build 23.1-b03, mixed mode).

22. Question: How to Configure a DB Connection Pool?

Answer:
1. Click to expand the Services and JDBC nodes.

2. Right-click the Connection Pools node and select Configure a New JDBC Connection Pool. The JDBC Connection Pool Assistant opens in the right pane.

3. In Choose Database, follow these steps:

a. Database type, select the DBMS of the database that you want to connect to. If your DBMS is not listed, select Other.
b. In the Database driver, select the JDBC driver you want to use to connect to the database. The list includes common JDBC drivers for the selected DBMS. Click Continue.
Note: You must install JDBC drivers in order to use them to create database connections in a connection pool. Drivers are listed in the JDBC Assistant with known required configuration options to help you configure a connection pool. Driver installation also includes setting system Path, Classpath, and other environment variables.

4. In Define Connection Properties, follow these steps:

a. In Name, enter a name for the new connection pool. The name should be unique within the domain.
b. Under Connection Properties, provide the information requested. The required attributes vary by the DBMS and JDBC driver you selected in the previous step. Many attributes include a common default value. Verify these values for your environment.
c. Click Continue.

5. In Test Database Connection, verify the connection properties and then click Test Driver Configuration. WebLogic Server attempts to load the driver and create a direct connection to the database server using the connection properties you provided. The JDBC driver must be installed and configured on the server (on the Administration server in multi-server environments) for the test to succeed.

If the test is successful, the Create and Deploy page is displayed. If the test is unsuccessful, an error message is displayed at the top of the page. Check the values on the page and correct any errors, then test the connection again.

You can click Skip this Step to skip the test and continue configuring the connection pool. Note that if you create and deploy a connection pool with errors, the connection pool configuration will be created, but the connection pool will not actually be deployed to servers or clusters. Also, when you restart servers, the servers will start with errors.

6. Create and Deploy, select the servers and clusters on which you want to deploy the connection pool. If you only have one server in your domain, the connection pool is automatically deployed to the server. Click Create and Deploy to complete the process.

In most cases, you should create a data source to use with a connection pool.

23. Question: How to Configure JMS?

Answer: The file jbm-jms.xml on the server classpath contains any JMS Queue, Topic and ConnectionFactory instances that we wish to create and make available to lookup via the JNDI.

A JMS ConnectionFactory object is used by the client to make connections to the server. It knows the location of the server it is connecting to, as well as many other configuration parameters. In most cases, the defaults will be acceptable. We’ll deploy a single JMS Queue and a single JMS Connection Factory instance on the server for this example but there are no limits to the number of Queues, Topics and Connection Factory instances you can deploy from the file.

We deploy one ConnectionFactory called Connection Factory and bind it in just one place in JNDI as given by the entry element. ConnectionFactory instances can be bound in many places in JNDI if you require it.

24. Question: How to Increasing JVM Size (heap size) of Managed Server?

Answer: You may need to increase the heap size for each Managed Server in your environment. If you use Node Manager to start the Managed Servers, you can specify a heap size as a Java argument on the Server Start tab for each Managed Server.

To change the Java Heap size for a managed server:

1. If you have not already done so, in the Change Center of the Administration Console.
2. In the left pane of the console, expand Environment > Servers.
3. In the Servers table, click the name of the server instance you want to configure.
4. On the Configuration tab, click Server Start.
5. In the Arguments field, specify the Java option to increase the heap size. For example: -Xmx1024m
6. Click Save.
7. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.

After you finish

You must reboot the server to use the new heap values.

25. Question: I love the New Domain Configuration Wizard. Can I Create My Templates?

Answer: Domain templates are used to create(or extend WebLogic server domains) with pre-configured resources such as JDBC, security realms, external libraries, log4j components. So when you create new domain you do not need to go to server console and create resources such as data source, etc. While creating domain by using template you will have those resources configured already for you.

Lets say, you have a team of 10 people and you like everybody to have same configuration, then create a template share with the team. Even it is very much useful if you have new member in the team.

Domain templates can be built in many ways. This blog covers how to built using WebLogic domain template builder.

Lets get started.

Step 1: Go to Start Menu->All programs->weblogic10gR3->Tools->Domain Template Builder
or
go to c:\bea\wlserver_10.3\common\bin in command prompt. and type config_builder.cmd

Step 2: Select create a domain template. If you are creating template for the first time.
Select create extension template if you are extending a existing template.
We will go with create domain template.

Step 3: Select a Template tab. Click on Basic Weblogic Server domain option. Click next

Step 4: Enter the name of template and other info.

Step 5: Using Add Button, Select libraries you want to add under lib folder. copy JDBC data sources you would like to have under the config/JDBC folder. If you want to have a log4j configuration, copy log4j.xml under domain_root folder.
Click next

Step 6: Select the database for the domain and click next.

Step 7: Enter the Admin Server Name and port numbers. Click next.

Step 8: Enter the username and password. Click next. Select No if you do want to add users/groups/roles

Step 9: Click next

Step 10: Click next

Step 11: Click next

Step 12: Click Create

Step 13: Click done.

This will create a domain template(jar file) that can be used to create a domain.

When creating a domain using domain config wizard, do select 2nd option which is “base this domain on existing template” as shown below and browse the template jar file and continue.

26. Question: Is There a Quick Way To Create And Start a Remote Managed Server?

Answer: In some WebLogic domains, you may want to run a Managed Server on a machine that is remote from the Administration Server for the WebLogic domain. You can do this by performing the following steps:
1. Create a Managed Server template by using the pack command. A Managed Server template, by default, contains only those files that are necessary for creating a Managed Server on a remote machine.

2. Create a Managed Server domain directory by copying and unpacking the Managed Server template on a remote machine.

3. Start the Managed Server on the remote machine.

27. Question: Should I Use a Separate Network For Multicast In a Cluster ?

Answer: It is good practice to use a separate network for corosync, which handles the cluster communication in Proxmox VE. It is one of the most important part in a fault-tolerant (HA) system and other network traffic may disturb corosync. Storage communication should never be on the same network as corosync!

Also, a good practice is to add redundancy to your Cluster Network. This can be done by using RRP in combination with two physically separated networks. Besides the obvious benefits that the cluster still works on a switch failure, also the maintenance of your systems becomes easier. A firmware upgrade of a switch, for example, can be done on a running cluster with no downtime, as the other ring still handles the traffic in the time between.

This article shows you a way to use a completely separated corosync network in Proxmox VE 4.0, version 4.0-23 of the PvE-cluster package is recommended.

28. Question: Steps For Deploying Applications Using Ant Script?

Answer: The following example provides a code excerpt from an Ant build file and demonstrates how to use WebLogic.Deployer to deploy a WebLogic Integration application in an automated way to a single-cluster domain, as shown in Single-Cluster Platform Domain Example.

The following sections step you through the process of deploying an application to a target domain.

Define the Properties in the Ant Script
Define the Main Ant Target
Define the Deploy Ant Target
Deploy the WebLogic Integration Application

Define the Properties in the Ant Script

To facilitate automation and reuse of the scripts in different target environments, the code excerpt references properties, such as ${cluster.name}, that are resolved in properties file imported to the Ant script. For example, the following properties are defined in a separate properties file, my props.properties:

deploy.dir=deploy
cluster.name=platformcluster
admin.addr=myhost
admin.port=9301
admin.username=username
admin.password=password
The file is referenced in the Ant build file as follows:

Define the Main Ant Target

The following defines the main Ant target for the WebLogic Integration application.

The target value is shown in bold.

Define the Deploy Ant Target

The deploy-app target, referenced in the Ant target above, uses the WebLogic.Deployer command to deploy the applications, as follows:

Deploy the WebLogic Integration Application

To deploy the WebLogic Integration application to a single domain, as depicted in Single-Cluster Platform Domain Example:

Start the Administration Server and Managed Servers, as described in Steps to Deploy the Application.

Deploy the WebLogic Integration application using the main Ant target, as follows:

ant deploy-NetApp

29. Question: Types of Load Balancing Techniques and Differences b/n Them?

30. Question: What Type of Shell Scripts You Have Created?

Answer: A shell script is a text file that contains a sequence of commands for a UNIX-based operating system. It’s called a shell script because it combines into a “script” in a single file a sequence of commands that would otherwise have to be presented to the system from a keyboard one at a time. The shell is the operating system’s command interpreter and the set of commands you use to communicate with the system. A shell script is usually created for command sequences for which a user has a repeated need. You initiate the sequence of commands in the shell script by simply entering the name of the shell script on a command line.

Writing a series of commands for the shell to execute is called shell scripting. It can combine lengthy and repetitive sequences of commands into a single and simple script, which can be stored and executed anytime. This reduces the effort required by the end user..

Let us understand the steps in creating a Shell Script

Create a file using a vi editor(or any other editor). Name script file with extension .sh
Start the script with #! /bin/sh
Write some code.
Save the script file as filename.sh
For executing the script type bash filename.sh

“#!” is an operator called shebang which directs the script to the interpreter location. So, if we use”#! /bin/sh” the script gets directed to the bourne-shell.

31. Question: What Type of wlst Scripts You Have Created?

Answer: In previous versions of FMW, each product suite had its own customized version of WLST. As discussed in the How to use WLST as a Jython 2.7 module blog,1 figuring out which product’s version of WLST to use and what the specific environment it creates can be challenging. For example, if you want to write scripts that interact with OSB, you need to use $ORACLE_HOME/OSB/common/bin/wlst.sh to execute them but if your scripts interact with SOA Suite (e.g., BPEL), you must use $ORACLE_HOME/soa/common/bin/wlst.sh. These product-specific shell scripts customize the CLASSPATH and loads the product’s WLST scripts, if any, from the $ORACLE_HOME//common/wlst/ directory before delegating to $ORACLE_HOME/oracle_common/common/bin/wlst.sh. In turn, the $ORACLE_HOME/oracle_common/common/bin/wlst.sh script also customizes the CLASSPATH and loads its WLST scripts (except in the WLS only installation case) before running WLST. This complexity makes it very difficult to write WLST scripts that manipulate multiple products since doing so would require creating a custom WLST environment that combines the environments of all of the relevant products.

Starting in FMW 12.2.1, Oracle has unified WLST so that there is a single version of WLST that automatically loads the necessary environment for all products installed in the Oracle Home from which WLST was invoked. The new unified version of WLST is accessed by running. $ORACLE_HOME/oracle_common/common/bin/wlst.sh. There are a number of changes that were made to support this, each of which I will discuss in the subsequent sections.

32. Question: When Do We Go For JDrivers and XA Drivers Advantages?

Answer: This question is focused on WebLogic Architect/developers. This choice depends on the application if it is having more transactions with Database requires reliable connections with the DB, more Entity Beans on the EJB-tier then we need to choose JDriver when JDO is in application side. Transactional consistency is mandatory for the application and response time is no matter then we choose XA.

33. Question: Why Do I Get the Following Exception When Viewing the JNDI Tree?

Answer:serializable(class.javax.naming.Binding)
java.io.NotSerializableException:

java.io.PrintWriter at

java.io.ObjectOutputStream.OutputObject

The Weblogic Server JNDI implementation requires objects to be serializable, not referencable. A Print Writer cannot be serialized and therefore should be declared transient.

34. Question: Will a JIT Make My Java Application Run Faster?

Answer: As an interpreted language with a compact bytecode, speed, or the lack of it, is what most often pops up as a problem in Java. We’ll primarily look at how to make Java run faster rather than making it fit into a smaller space — although we’ll point out where and how these approaches affect memory or network bandwidth. The focus will be on the core language rather than on the Java APIs.

By the way, one thing we won’t discuss here is the use of native methods written in C or assembly. While using native methods can give the ultimate performance boost, it does so at the cost of Java’s platform independence. It is possible to write both a Java version of a method and native versions for selected platforms; this leads to increased performance on some platforms without giving up the ability to run on all platforms. But this is all I’m going to say on the subject of replacing Java with C code. (See the Java Tip, “Write native methods” for more information on this topic.) Our focus in this article is on how to make Java fast.

35. Question: What are Foreign JMS Server Definitions?

Answer: WebLogic JMS enables you to reference foreign (that is, external) JMS providers within a local WebLogic JNDI tree. Using the Foreign JMS Server node, you can quickly map a foreign JMS provider so that its connection factories and destinations appear in the WebLogic JNDI tree as a local JMS object. A Foreign JMS Server configuration can also be used to reference remote instances of WebLogic Server in another cluster or domain in the local WebLogic JNDI tree.

36. Question: What are the Difference Between Connection Pool and Data Source?

Answer: In the JDBC API, databases are accessed via DataSource objects. A DataSource has a set of properties that identify and describe the real-world data source that it represents. These properties include information such as the location of the database server, the name of the database, the network protocol to use to communicate with the server, and so on. In the Application Server, a data source is called a JDBC resource.

Applications access a data source using a connection, and a DataSource object can be thought of as a factory for connections to the particular data source that the DataSource instance represents. In a basic data source implementation, a call to the getConnection method returns a connection object that is a physical connection to the data source.
If a DataSource object is registered with a JNDI naming service, an application can use the JNDI API to access that DataSource object, which can then be used to connect to the data source it represents.

DataSource objects that implement connection pooling also produce a connection to the particular data source that the DataSource class represents. The connection object that the getConnection method returns are a handle to a PooledConnection object rather than being a physical connection. An application uses the connection object in the same way that it uses a connection. Connection pooling has no effect on application code except that a pooled connection, like all connections, should always be explicitly closed. When an application closes a connection that is pooled, the connection is returned to a pool of reusable connections. The next time getConnection is called, a handle to one of these pooled connections will be returned if one is available. Because connection pooling avoids creating a new physical connection every time one is requested, it can help applications run significantly faster.

37. Question: What are the Tuning Techniques You Applied?

Answer: Database tuning can be an incredibly difficult task, particularly when working with large-scale data where even the most minor change can have a dramatic (positive or negative) impact on performance.

In mid-sized and large companies, most SQL database tuning will be handled by a Database Administrator (DBA). But believe me, there are plenty of developers out there who have to perform DBA-like tasks. Further, in many of the companies I’ve seen that do have DBAs, they often struggle to work well with developers—the positions simply require different modes of problem-solving, which can lead to disagreement among coworkers.

When working with large-scale data, even the most minor change can have a dramatic impact on performance.

On top of that, corporate structure can also play a role. Say the DBA team is placed on the 10th floor with all of their databases, while the devs are on the 15th floor, or even in a different building under a completely separate reporting structure—it’s certainly hard to work together smoothly under these conditions. In this article, I’d like to accomplish two things:

1. Provide developers with some developer-side database tuning techniques.

2. Explain how developers and DBAs can work together effectively.

38. Question: What Are Workload Managers For?

Answer: Workload Manager (WLM) is designed to provide the system administrator with increased control over how the scheduler virtual memory manager (VMM) and the disk I/O subsystem allocate resources to processes.
You can use WLM to prevent different classes of jobs from interfering with each other and to allocate resources based on the requirements of different groups of users.

WLM is primarily intended for use with large systems. Large systems are often used for server consolidation, in which workloads from many different server systems (such as a printer, database, general user, and transaction processing systems) are combined into a single large system to reduce the cost of system maintenance. These workloads often interfere with each other and have different goals and service agreements.

WLM also provides isolation between user communities with very different system behaviors. This can prevent effective starvation of workloads with certain behaviors (for example, interactive or low CPU usage jobs) by workloads with other behaviors (for example, batch or high memory usage jobs).

39. Question: What is Advantage if Silent Mode Installation…Urgent.Need Answer to This Question?

Answer:Silent-mode installation allows you to define an installation configuration only once and then use the configuration to duplicate the installation on many machines. During installation in silent mode, the installation program reads the settings for your configuration from an XML file that you create before beginning the installation. The installation program does not display any configuration options during the installation process. Silent-mode installation works on both Windows and UNIX systems.

The instructions in this section are based on the assumption that you have already acquired the installation program as described in Product Distribution.
Important Considerations for Silent-Mode Installation:

When you are performing an installation in silent mode, keep in mind the following considerations:

You must use the package installer for silent-mode installation. Silent-mode installation is not supported with the net installer. Filenames for the net installer version of the installation program are preceded by net_, for example net_platformXXX_solaris.bin, where XXX represents the version number of the software you are installing. Do not attempt to use installation programs with filenames beginning with net_ for silent-mode installation.

Silent-mode installation requires the same amount of temporary disk space and uses the same temporary storage directories as a standard installation. For more information, see Temporary Disk Space Requirements. The installation program does not alert you if there is not enough space in the temporary directory.

A silent-mode installation takes the same amount of time as a standard installation. At the beginning of a silent-mode installation, an initial installation program window or message is displayed briefly, indicating that the installation has started. No messages are displayed to indicate that the installation is in progress or has completed successfully. You can, however, specify that exit code is displayed to the console if you initiate the installation using a script. For more information, see Returning Exit Codes to the Console.

Incorrect entries in the silent.xml file can cause installation failures. To help you determine the cause of a failure, we recommend that you create a log file when you start the installation. For more information, see Generating a Verbose Installation Log.

The XML definition () must be at the very beginning of the silent.xml template file. There cannot be any spaces or line breaks before the XML definition.

You cannot reinstall WebLogic Platform components on top of a previously installed version of the same component. You can, however, add components to an existing installation. For example, you can install WebLogic Server during one installation, and WebLogic Integration or WebLogic Portal during a separate installation. However, to reinstall the same version of one of the product components, you must first uninstall the component, as described in Uninstalling WebLogic Platform or install in another location.

40. Question: What is the Cluster and Advantages of Clustering?

Answer: Server clustering is a form of attaching a number of servers into a group, which works as a redundant solution. Server clustering is useful when a single server fails within the cluster of servers. Bringing multiple servers together to form a cluster offers more power, strength, redundancy, and scalability.
The server clustering concept ensures the round the clock availability to the online businesses, even if there are some major issues going on with a server within the cluster. The server clustering is a successful solution implemented in many web hosting services, despite the fact that it has also some limitations.

In this article, we are going to look at the advantages and disadvantages of server clustering.

Advantages of Server Clustering:

1. Server clustering is specifically designed for high availability solutions. In case, if a server is having a problem another server from the cluster takes over the server having an issue. This ensures the high availability of web applications.

2. Server clustering is completely a scalable solution. Resources can be added to the cluster accordingly.

3. If a dedicated server from the cluster requires maintenance, it can be stopped while other servers handle its load. Thus, makes the maintenance easier. The clustered servers can be configured and managed easily without any trouble.

41. Question: What is the Difference Between the Weblogic Server and WebSphere?

Answer: Though the functionality of these two products is closer, there are minor differences in the standards that support it. These differences are:

1. WebSphere’s focus is more on connectivity, integration and web services whereas WebLogic’s focus is more on emerging standards and ease-of-use of J2EE.

2. WebSphere’s performance is better in terms of implementations of J2EE is a little more involved, and supports more integration and transaction management to a great extent.
3. WebLogic is supported by default transaction attribute – “Supports”, whereas WebSphere has not default transaction attribute.
4. WebSphere strictly follows J2EE architecture.

42. Question: What is JMS and How Do You Configure it?

Answer:A JMS server acts as a management container for resources within JMS modules. Some of its responsibilities include the maintenance of persistence and state of messages and subscribers. A JMS server is required in order to create a JMS module.

JMS Server Configuration:

The file jbm-jms.xml on the server classpath contains any JMS Queue, Topic and ConnectionFactory instances that we wish to create and make available to lookup via the JNDI.

We’ll deploy a single JMS Queue and a single JMS Connection Factory instance on the server for this example but there are no limits to the number of Queues, Topics and Connection Factory instances you can deploy from the file.

We deploy one ConnectionFactory called ConnectionFactory and bind it in just one place in JNDI as given by the entry element. ConnectionFactory instances can be bound in many places in JNDI if you require it.

43. Question: What is Static List, Dynamic List, And General List?

Answer: Static lists are created immediately upon request, and then stored in the database used by List Manager. Use static lists for direct mail campaigns that you run infrequently, or for lists of recipients that do not change often.
Dynamic lists are created at run time, for example, when the list is being exported from List Manager for use in a direct mail campaign. Each time the list is requested, the List Manager gathers the most recent data in the Data Warehouse. Only the information needed to create the list is stored in the database used by List Manager. Use dynamic lists for direct mail campaigns that you will run frequently, or for lists of recipients that are updated frequently.

The General Service List (GSL) is a list of roughly 2,000 words published by Michael West in 1953.[1] The words were selected to represent the most frequent words of English and were taken from a corpus of written English. The target audience was English language learners and ESL teachers. To maximize the utility of the list, some frequent words that overlapped broadly in meaning with words already on the list were omitted. In the original publication, the relative frequencies of various senses of the words were also included.

44. Question: What is the Important Configuration File in Apache?

Answer: https configuration files contain one directive per line. The backslash “\” may be used as the last character on a line to indicate that the directive continues onto the next line. There must be no other characters or white space between the backslash and the end of the line.

Arguments to directives are separated by whitespace. If an argument contains spaces, you must enclose that argument in quotes.
Directives in the configuration files are case-insensitive, but arguments to directives are often case sensitive. Lines that begin with the hash character “#” are considered comments and are ignored. Comments may not be included on the same line as a configuration directive. White space occurring before a directive is ignored, so you may indent directives for clarity. Blank lines are also ignored.

The values of variables defined with the Define of or shell environment variables can be used in configuration file lines using the syntax ${VAR}. If “VAR” is the name of a valid variable, the value of that variable is substituted into that spot in the configuration file line, and processing continues as if that text were found directly in the configuration file. Variables defined with Define take precedence over shell environment variables. If the “VAR” variable is not found, the characters ${VAR} are left unchanged, and a warning is logged. Variable names may not contain colon “:” characters, to avoid clashes with RewriteMap’s syntax.

Only shell environment variables defined before the server is started can be used in expansions. Environment variables defined in the configuration file itself, for example with SetEnv, take effect too late to be used for expansions in the configuration file.

The maximum length of a line in normal configuration files, after variable substitution and joining any continued lines, is approximately 16 MiB. In .htaccess files, the maximum length is 8190 characters.

You can check your configuration files for syntax errors without starting the server by using apachectl configtest or the -t command line option.

You can use mod_info’s -DDUMP_CONFIG to dump the configuration with all included files and environment variables resolved and all comments and non-matching and sections removed. However, the output does not reflect the merging or overriding that may happen for repeated directives.

45. Question: What is the Best Way To Configure an MDB?

Answer: The MDB implementation for JBoss has been written such that a user should not have to know a lot about the internals of JBoss. Apart from the few necessary lines in jboss.xml nothing else than a standard knowledge of Message Driven Beans should suffice.
Following the design of JBoss, the MDB implementation is also extremely configurable, if one wants to tune or totally change the default configuration and implementation! Here follow some short notes on how to configure MDB for JBoss.

46. Question: What is the Important Configuration File in Apache?

Answer: HTTP configuration files contain one directive per line. The backslash “\” may be used as the last character on a line to indicate that the directive continues onto the next line. There must be no other characters or white space between the backslash and the end of the line.

You can check your configuration files for syntax errors without starting the server by using the apachectl configtest or the -t command line option.

47. Question: What is the Use of Multicast Address?

Answer: A multicast address is a single IP data packet set that represents a network host group. Multicast addresses are available to process datagrams or frames intended to be multicast to a designated network service. Multicast addressing is applied in the link layer (Layer 2 of the OSI Model) and the Internet layer (Layer 3 of the OSI Model) for IP versions 4 (IPv4) and 6 (IPv6).

48. Question: What is a Non-Durable Topic Subscriber?

Answer: In the publish/subscribe messaging model of JMS, messages are retained in the Topic as long as either they are delivered to all the current/active subscribers or they are expired. This means that subscribers who have disconnected and are not listening actively, would not receive any messages published on the topic during the time they remain disconnected. Thus, in a non-durable subscription, any message published on the topic, when the subscriber was inactive would be lost.

49. Question: What is enroll in WLST?

Answer: There are lots of WLST command though I feel it’s very important and saw lots of engineers struggling with this So, though to publish a separate post for this.
nmEnroll:

NmEnroll is used to enroll a machine or you can say to enroll a domain with the node manager because if you have multiple domains ( of the different installer ) running on a host then you can handle all with a single node manager but you have had to enroll each domain with the same node manager.
This is applicable if you have domains from different oracle_home or you can say from different installers on the same host (means you have more than one installation of Weblogic on the same host with each installer having its different host).

If you are creating multiple domains from a single installer then no need to enroll because it will enroll automatically.

50. Question: What is a Cluster?

Answer: Group of independent servers (usually in close proximity to one another) interconnected through a dedicated network to work as one centralized data processing resource. Clusters are capable of performing multiple complex instructions by distributing workload across all connected servers. Clustering improves the system’s availability to users, its aggregate performance, and overall tolerance to faults and component failures. A failed server is automatically shut down and its users are switched instantly to the other servers.

Weblogic Tutorials Over View

What is Weblogic Course?

Weblogic video training – Are you not aware of it? Want to learn the web logic program. We are the SVR technologies providing you various courses in which weblogic is the one. You can watch the tutorials and demo videos for free. Learn web logic program and establish your career in the IT field. We provide you the course based videos which plays a significant role in learning web logics. The whole course can be learned online through our videos with the help of our trainers. Our trainers give you classes through Weblogic video training. We have chosen this path as visuals are better teachers to anyone. Do you lack confidence in learning this tough course? Well we make you gain confidence and will teach it in an easy way. Weblogic video training are available throughout the year. We also have our customer service portal where you can clarify your doubts. Our trainers teach you every step in the Weblogic video training which you can make use of it and even clarify your doubts at that instant of time. Join us and be a better web logic programmer. Visit our site for more information.

Weblogic Course Overview

SVR technologies is online weblogic training institute where online interactive training is a common experience and many students in the past have learned, mastered and landed excellent jobs on their way to their careers. Our Weblogic video training takes place with well-prepared training materials. We provide documentation and the best interview preparation materials for learners. SVR Technologies has access to a faculty of esteemed and highly qualified consultants to deliver the courses. These trainers are not in any way academics, but rather specialists actively involved in consulting to business in their particular fields. This gives the learners a fuller insight of the needs and as well as knowledge about actual and future trends in the market, and makes the Weblogic video training course extremely practical and relevant. We don’t just give training and leave you on your own but support you even after you get into the job. We are providing web based weblogic online training in major IT Courses, where you can sit at home in front of the system and learn without travel or relocate during the training program. You can practice exercises and real-time projects which are given by our esteemed trainers.

Job Opportunities on WebLogic

In a telecommunication network where programs communicate by exchanging formally-defined messages that is, through the act of massaging, a Weblogic video training is an intermediary program that translates a message from the formal messaging protocol of the sender to the sender to the formal messaging protocol of the receiver. Message programs are sometimes known as middleware. Message enables e.g. operations people to monitor all integrations in one place. Also, if a data format changes it can be trivial to determine which integrations are affected by the change. Weblogic video training is also able to deal with messaging outside the limitations of JMS. Career for message broker jobs is abundantly available. Weblogic video training helps you in getting the jobs like IBM middleware administrator, SOA developer, application developer, Web logic etc. the median salary of this Web logic skill person is $116000 median per annum. So it has a definite future in the coming days and with the help of our Weblogic video training we make you prepare for the coming future and help you get trained for getting a good job.

SVR Features

SVR Technologies is established with the motto of providing Weblogic video training interactive learning of essential IT related business courses viz., weblogic Courses, at any time and at any place and provides an easy, convenient and effective solution. SVR Technologies is manned by real time IT Professionals. Each is an expert in his related field having implementation exposure to various business scenarios of the respective technologies. Therefore you can be sure that whatever you learn will be most relevant to your job and project. Effective results can be achieved in as little as 15 minute blocks of time not hours or days as is common with seminars and schedule courses. We are dedicated to providing the very best in Weblogic video training while providing quality training at affordable prices. Our goal is to product Weblogic video training that is within the budget of anyone who desires to improve their IT skills. Our growth and reputation is credited to our staff for which we offer best opportunities to pursue and excel in their goals, both professionally and personally. Our robust Human resource management practices enable us to create this environment for you.

Conclusion

Weblogic video training is the distinguishing factor for us among other technology organizations which enables us to excel and innovate in what we do for our clients and in what we stand for as a company. There has been a rapid growth in the Weblogic video training . Students are attracted by the salary package and scope for career growth, especially from the electronics, computers and operating systems background. SVR Technologies, a certified training and Consultancy Company has come up with Weblogic video training to provide budding engineers a platform for learning, experimenting and putting across their ideas and abilities to solve problems related to our growing economy. Weblogic video training has taken off in a big way in India as India becomes the global centre for talent in the field. Most of these institutes do not have a rich enough curriculum. We’re looking to hire bachelors and masters in Statistics and Economics from institutes such as Indian Statistical Institute, JNU and Calcutta University. Weblogic video training options in India are severely limited at this point of time.

Weblogic Tutorials | Weblogic tutorial for Beginners

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