Weblogic Server Videos | Weblogic Tutorial for Beginners
1. Question: Can I Do Integration With WebLogic Express?
Answer: WebLogic Express is intended to be used as a Java Servlet/Web application engine. It does not support the integration features that come with WebLogic Server like J2EE Connector Architecture (JCA) and WebLogic Server-Tuxedo connector.
2. Question: Can I Use WebLogic Express as an Admin Server in a Larger WebLogic Server Cluster?
Answer: Yes, you can use WebLogic Express as the admin server in a larger WebLogic Server Cluster.
3. Question: Can I Use WebLogic Express as the Web Tier in an n-tiered Application Architecture?
Answer: Yes, WebLogic Express will fit your Web-tier needs very well. WebLogic Express can be used as your primary Web server and also host advanced J2EE Web applications built with HTML, XML, Servlets, JSP, applets, etc. WebLogic Express has complete Web server functionality, including a built-in HTTP server.
4. Question: Can I Get JDBC Drivers With WebLogic Express?
Answer: Yes, BEA offers two JDBC drivers that come with WebLogic Express:
- Type 2 native JDBC driver for Oracle.
- Type 4 JDBC driver for Microsoft SQL Server
5. Question: Where Can I Download WebLogic Express For an Evaluation?
Answer: You can download a trial version of WebLogic Express at https://www.oracle.com/products/.
To help you with your WebLogic Express evaluation, there is a WebLogic Express evaluation guide that will guide you through the process of a WebLogic Express installation, creating and deploying a Web application on WebLogic Express, and reviewing WebLogic Express features.
6. Question: Do I Need to Make Any Changes to My Web Application Currently Deployed in Tomcat in Order to Move it to WebLogic Express?
Answer: Any Web application deployed in the standard .WAR format, as per the Servlet specification, will deploy without code changes on WebLogic Express. You may have to define the resource and resource mappings in the WebLogic Express server if your application depends on any WebLogic Express resources.
7. Question: What Version of the Java Servlet and JSP Specifications Does WebLogic Express Support?
Answer: WebLogic Express 8.0 supports Java Servlet version 2.3 and JSP version 1.2
8. Question: Can a Domain Include a Mix of WebLogic Express and WebLogic Server Instances?
Answer: Yes, you can have WebLogic Express and WebLogic Server instances in the same domain. The domain would be managed by a single Administration Server and Administration Console.
9. Question: What is a WebLogic Express Domain?
Answer: For ease of administration and management, one or more WebLogic Express instances – and their associated resources – are grouped together in an administrative unit called a domain. A domain can include multiple WebLogic Express clusters and non-clustered WebLogic Express instances. A single Administration Server manages a domain.
A domain could consist of only one WebLogic Express instance. However, that sole server instance would serve as an Administration Server, because each domain must have exactly one Administration Server.
You can define multiple domains based on different system administrators’ responsibilities, application boundaries, or geographical locations of servers.
10. Question: How Do I Install a New WebLogic Express License?
Answer: The WebLogic Express license file resides under the BEA_HOME directory of your installation. The license file contains licenses for all products of the BEA WebLogic Platform.
If you do not have any other Weblogic products installed, you could simply copy over the new WebLogic Express license file to the existing one. Otherwise — and preferably — install the new WebLogic Express license with the following steps:
1. Save the new license file with a name other than license. bea in the target BEA Home directory. For example, save the file as platform_license.bea. Use this file as the license_update_file in step 4 of this procedure.
2. Open a command shell and go to the target BEA Home directory.
3. If it is not already included, add the JDK to your PATH variable by entering the following commands:
- On a Windows system: set PATH=BEA_HOME\jdk131_03\bin;%PATH%
- On a UNIX system: PATH=BEA_HOME/jdk131_03/bin:$PATH
export PATH
4. Merge the license update file into your existing license by entering one of the following commands:
- On a Windows system: UpdateLicense license_update_file
- On a UNIX system: sh UpdateLicense.sh license_update_file.
license_update_file is the name to which you saved the license update file in step1.
5. Save a copy of your updated license. bea file in a safe place outside of the BEA_Home directory or on a different machine.
11. Question: Does WebLogic Express Support Clustering?
Answer: Yes, WebLogic Express Premium Edition has full clustering capabilities for your mission-critical Web applications. Clustering support in Premium Edition includes clustered JDBC, in-memory replication of servlet sessions with automatic failover, and load balancing features.
12. Question: Does WebLogic Express Support Web Services?
Answer: Yes, WebLogic Express is Web Services enabled. WebLogic Express offers presentation-level Web Services with the latest XML, SOAP, and JAX-RPC standards.
13. Question: Is the Upgrade From WebLogic Express to WebLogic Server Difficult?
Answer: Upgrading from WebLogic Express to WebLogic Server is actually very easy. Since WebLogic Express and WebLogic Server share the same code base, your applications will run as is – without any modifications – on WebLogic Server.
14. Question: What is Two-Phase Deployment?
Answer: WebLogic Server 8.1 uses two-phase deployment. Previous to WebLogic Server 7.0, when you deployed an application, a copy of the application file(s) was sent to all the targeted servers, which in turn, loaded the application. If any of those servers failed (or partially failed), the deployment was placed in an inconsistent state.
In the current release of WebLogic Server, the application is first prepared across the servers and then activated in a separate phase. In the prepare phase, the application is prepared for deployment without allowing user requests to the application. When the servers are ready, the application is activated everywhere. With this model, it is still possible to have a failure occur during the activation phase, which leads to an inconsistent state, but it is much less likely to occur.
15. Question: What is WebLogic Express?
Answer: BEA WebLogic Express (WLX) is a production-proven Java servlet engine designed to get you up and running on the BEA WebLogicTM product line in a cost-effective manner. WebLogic Express allows you to quickly develop and launch dynamic Web sites and basic Web applications that do not require the full suite of application server capabilities. WebLogic Express is a good fit for projects that don’t yet use advanced technologies such as EJB, JMS, and JCA, and instead favor Servlets, Java Server Pages (JSP), Java objects, RMI, and JDBC. WebLogic Express notably does not support EJB, JMS, JCA, the two-phase commit protocol for transactions, or some other features targeted at enterprise-level applications.
16. Question: Is There Still a Guest User?
Answer: The guest user is no longer supported by default in this release of WebLogic Server. In WebLogic Server 6.x, the guest was both the name of a user and the name for anonymous logins. The new user name for an anonymous user is. You can change this username by booting WebLogic Server with the following command-line argument: Dweblogic.security.anonymousUserName=newAnonymousUserName.
This argument allows you to make the name of the anonymous user guest for the purpose of backward compatibility.
If you want to have a guest user in this release of WebLogic Server, create a user with the name guest in the Authentication provider in the default security realm and give the user the password of the guest. If your code depends on the guest user, you should consider rewriting it to use the utility methods in weblogic.security.WLSPrincipals.
17. Question: Can WebLogic Server Start With a UNIX Boot?
Answer: You can add a startup script to your UNIX RC scripts to run WebLogic Server at UNIX boot time. For information about creating startup scripts, refer to Starting an Administration Server Using a Script in Administration Console Online Help.
18. Question: If I Install mod_wl_ssl.so With mod_perl to Apache 1.3.19, Why Does Segmentation Fault (11) Occur in mod_wl_ssl.so When I Access WebLogic Via the Plug-in?
Answer: The server could be any 6.x and the operating system could be any version of Solaris. (Company) The environment is WebLogic Server 6.x (Use mod_wl_ssl.so), Solaris 2.x.
In order to avoid getting Segmentation Fault (11), add a VirtualHost block for HTTP as in the following example:
# General setup for the virtual host
DocumentRoot “/export/home/happy/local/apache_1.3.19/htdocs”
ServerName happy1
ServerAdmin happy@happyville
ErrorLog /export/home/happy/local/apache_1.3.19/logs/error_log
TransferLog /export/home/happy/local/apache_1.3.19/logs/access_log
For the SSL port, also use the IP address in:
VirtualHost 206.189.223.111:443
Use any valid DNS name for the ServerName.
19. Question: Can I Use Another Vendor’s Destination With a WebLogic JMS API?
Answer: WebLogic Server JMS does not know what to do with foreign destinations that it runs into. This issue has been discussed with Sun and the specification does not clearly define destinations well enough for vendors to interoperate at that level. They agree that it is sufficient not to handle foreign destinations preferably in such a way that sending/receiving still work. For WebLogic JMS, if you do a setJMSdestination (you should not because it is only for the provider to set it) with a foreign destination, it gets ignored (set to null). Similarly, if you do a setJMSReplyTo for a foreign destination, WebLogic JMS will ignore it (set it to null)
20. Question: How Do I Create a Producer Pool?
Answer: For instructions on how to accomplish this, see “Using JMS With EJBs and Servlets” in Programming WebLogic JMS. For a detailed code sample, see the “Appendix A: Producer Pool Example” section in the “WebLogic JMS Performance Guide” white paper (WeblogicJMSPerformanceGuide.zip) on the JMS topic page.
21. Question: Is WL JMS XAResource Compliant?
Answer: Yes. WebLogic Server 6.1 or later fully implements the X A Connection, X A Connection Factory, X A Queue Connection, X A Queue Connection Factory, X A Queue Session, X A Session, X A Topic Connection, X A Topic Connection Factory, and X A Topic Session methods. These methods are defined as optional in Sun Micro systems’ JMS specification and are not part of the X A Resource interface.
Note: These interfaces are not needed since WebLogic JMS automatically registers itself with the WebLogic transaction monitor.
22. Question: What is the Value of Clustering For WebLogic JMS?
Answer: In version 6.x, you could establish cluster-wide, transparent access to destinations from any server in the cluster by configuring multiple connection factories and using targets to assign them to WebLogic Servers, as described in “Configuring WebLogic JMS Clustering” in the Programming WebLogic JMS. Each connection factory can be deployed on multiple WebLogic Servers, serving as connection concentrators. You could configure multiple JMS servers on the various nodes in the cluster—as long as the servers are uniquely named—and can then assign destinations to the various JMS servers.
For WebLogic JMS 7.0 or later, you can also configure multiple destinations as part of a single distributed destination set within a cluster. Producers and consumers are able to send and receive through a distributed destination. In the event of a single server failure within the cluster, WebLogic JMS then distributes the load across all available physical destinations within the distributed destination. For more information, see “Distributed Destination Tasks” in the Administration Console Online Help.
WebLogic JMS also takes advantage of the migration framework implemented in the WebLogic Server core for clustered environments. This allows WebLogic JMS to properly respond to migration requests and bring a JMS server online and offline in an orderly fashion. This includes both scheduled migrations as well as migrations in response to a WebLogic Server failure. For more information, see “Configuring JMS Migratable Targets” in the Programming WebLogic JMS.
23. Question: How Do I Use Persistence?
Answer: Use the following guidelines:
1. Make sure the JMSServer you are using has a store configured. The JMS server configuration entry in the config.xml file should contain a line of the form
Store=””
Note that if JMS boots without a store configured, it is assumed the customer did not want one, and persistent messages are silently downgraded to non-persistent (as specified for JMS 1.0.2b).
2. Make sure you are not using “Message.setJMSDeliveryMode”. This is overwritten, as it is a vendor-only method.
3. Make sure you are calling either:
QueueSender.send(msg, deliveryMode, …)
— or —
QueueSender.setDeliveryMode(delivery mode)
— or —
set DefaultDeliveryMode mode on connection factory in the config.xml file to persistent (the QueueSender.setDeliver/send overrides this value). Similarly, for topics, you would set this via the TopicPublisher.
4. Make sure you don’t have “DeliveryModeOverride” set to Non-Persistent on the Destination in the config.xml file.
5. If you are using pub/sub, only durable subscriptions persist messages. Non-durable subscriptions have no need to persist messages, as by definition they only exist for the life of the server.
24. Question: How Do I Use a Third-Party JDBC Driver With WebLogic JMS?
Answer: If your JDBC driver is not included in the list of drivers in the question about JDBC databases supported by WebLogic JMS, then the tables required by JMS must be created manually. Follow the procedures in JDBC Database Utility in Programming WebLogic JMS to manually create the database tables for the JDBC store.
Note: WebLogic Server only guarantees support for the JDBC drivers listed in “JMS JDBC Stores Tasks” in the Administration Console Online Help. Support for any other JDBC driver is not guaranteed.
Another option is to consider using a JMS file store instead of a JMS JDBC store. File stores are easier to configure and may provide significantly better performance.
25. Question: Which Types of JDBC Databases Does WebLogic JMS Support?
Answer: The JMS database can be any database that is accessible through a JDBC driver. For a list of drivers that WebLogic JMS detects.
26. Question: What is Error “ORA-6502”?
Answer: The default length of a string bound to an OUTPUT parameter of a CallableStatement is 128 characters. If the value you assign to the bound parameter exceeds that length, you will get this error.
You can adjust the length of the value of the bound parameter by passing an explicit length with the scale argument to the Callable Statement.registerOutputParameter() method.
27. Question: When Should I Use MultiPools?
Answer: You can use MultiPools in one of two ways 1) for high availability in the event a database connection fails, or 2) for load balancing between JDBC connection pools. Because you can choose only one option, you need to determine the primary purpose of your MultiPool.
Note: If you implement Multipools for a JDBC application, do not configure driver-level load balancing or failover for the connection pools used by the MultiPool—the MultiPool provides the same functionality as configuring driver-level load balancing or failover.
28. Question: How Do I Set Up My CLASSPATH?
Answer: Setting up your CLASSPATH correctly depends on what you are trying to do. The most common tasks are described below:
- Starting WebLogic Server. See Setting the Classpath Option in the “Starting and Stopping WebLogic Servers section of Administration Console Online Help. In addition, your WebLogic distribution includes shell scripts that you can use to start the server. These scripts, which are located in the domain directories under the config directory of your WebLogic Server distribution, automatically set up the CLASSPATH variable in the shell before starting the server.
- Compiling Application Classes or Using WebLogic Server Utilities. See Setting the Classpath for Compiling in the Developing WebLogic Server Components section of Developing WebLogic Server Applications.
- Working With WebLogic Server Code Examples. See the WebLogic Server Examples Guide located at samples/server/examples/src/examples/examples.html in your WebLogic Server distribution.
29. Question: What are JMS Resource References?
Answer: Resource references are specified by servlet and EJB application developers and packaged with an application. They are easy-to-use and provide a level of indirection that lets applications reference JNDI names defined in an EJB descriptor rather than hard-coding JNDI names directly into application source code.
JMS resource-references provides two additional features:
Automatic pooling of JMS resources when those resources are closed by the application.
Automatic enlistment of JMS resources with the current transaction, even for non-WebLogic JMS providers.
Inside an EJB or a servlet application code, use JMS resource references by including resource-ref elements in the deployment descriptors and then use JNDI a context to look them up using the syntax
Resource references provide no functionality outside of application code and therefore are not useful for configuring a message-driven EJB’s source destination or a messaging bridge’s source or target destinations.
30. Question: How Can I Tune WebLogic JMS Interoperability Features?
Answer: For information on tuning message-driven EJBs and the WebLogic Messaging Bridges, see the WebLogic JMS Performance Guide white-paper available on the JMS topic page.
31. Question: How Can I Pool JMS Resources?
Answer: Remote and local JMS resources, such as client connections and sessions, are often pooled to improve performance. Message-driven EJBs automatically pool their internal JMS consumers. JMS consumers and producers accessed through resource-references are also automatically pooled. For more information on resource pooling, including information on writing a custom pool, see the WebLogic JMS Performance Guide white-paper available on the JMS topic page. (online training institute)
32. Question: I Downloaded the WebLogic Server Installation File, But the Installation Program Will Not Run. What Should I Do?
Answer: The installation file may have been corrupted during the download. Run a checksum on the installation file and check with technical support for the proper values.
33. Question: Can I Still Use the Default Connection Factories Supported in WebLogic JMS 5.1?
Answer: Yes. For detailed information about using 5.1 connection factories in later versions of WebLogic JMS, see “Porting WebLogic JMS Applications” in Programming WebLogic JMS.
34. Question: What Makes WebLogic JMS Unique?
Answer: There are numerous features that make WebLogic JMS unique. For a complete listing, see “Introduction to WebLogic JMS” in Programming WebLogic JMS.
35. Question: Which Versions of the EJB Specification are Supported By WebLogic Server?
Answer: Enterprise JavaBeans (EJB) 3.1 technology is the server-side component architecture for the development and deployment of component-based business applications. EJB technology enables rapid and simplified development of distributed, transactional, secure, and portable applications based on Java EE 6 technology.
The EJB 3.1 specification provides simplified programming and packaging model changes. The mandatory use of Java interfaces from previous versions has been removed, allowing plain old Java objects to be annotated and used as EJB components. The simplification is further enhanced through the ability to place EJB modules directly inside of Web applications, removing the need to produce archives to store the Web and EJB components and combine them together in an EAR file.
36. Question: What is the Free Pool?
Answer: The free pool is a data structure the EJB container uses to cache anonymous instances of a given bean type. The free pool improves performance by reusing objects and skipping container callbacks when it can.
37. Question: Why Won’t the Examples Work?
Answer: Each example comes with detailed instructions for building the example class files, configuring the server, and running the example. Make sure that you have completed each of the example instructions.
Usually problems with examples are related to your environment. Here are some troubleshooting hints:
If you are using a database, make sure you have run the utility utils.dbping to verify that your JDBC driver is correctly installed and configured.
Run the setEnv script to make sure your CLASSPATH is correctly set in the shell or DOS window in which you are running the examples. For more information, see Setting your development environment.
Check the instructions for the examples to make sure you have changed any user-specific variables in the code before compiling.
Verify that you are compiling with the -d option to direct the class files into the proper directory, as defined in the example instructions.
If the example is an applet, check the CODE and CODEBASE, and make sure WebLogic Server is running.
For more information, see the WebLogic Server Examples Guide located at samples/examples/examples.html in your WebLogic server distribution.
38. Question: How Many WebLogic Servers Can I Have On a Multi-CPU Machine?
Answer: There are many possible configurations and each has its own advantages and disadvantages. BEA WebLogic Server has no built-in limit for the number of server instances that can reside in a cluster. Large, multi-processor servers such as Sun Microsystems, Inc. Sun Enterprise 10000, therefore, can host very large clusters or multiple clusters.
In most cases, WebLogic Server clusters scale best when deployed with one WebLogic Server instance for every two CPUs. However, as with all capacity planning, you should test the actual deployment with your target web applications to determine the optimal number and distribution of server instances. See Performance Considerations for Multi-CPU Machines for additional information.
39. Question: How Do Clients Learn About New WebLogic Server Instances?
Answer: Once a client has done a JNDI lookup and begins using an object reference, it finds out about new server instances only after the cluster-aware stub has updated its list of available servers.
40. Question: What Happens When a Failure Occurs and the Stub Cannot Connect to a WebLogic Server Instance?
Answer: The stub removes the instance that is failed from its list when a failure occurs. The stub uses DNS again for the purpose of finding a running server and obtains a current list of instances when there are no servers left in its list. The list of available server instances in the cluster will get periodical refreshment, which allows making the advantage of new servers. This is because; the servers are added to the cluster.
41. Question: How Do Stubs Work in a WebLogic Server Cluster?
Answer: The enhancements support for WebLogic Server messages is provided by T3. These enhancements include object replacement, which works in WebLogic Server clusters’ context and HTTP. Java Object Serialization, RMI predation is done by T3. T3 is a superset of java Object. Serialization and RMI can be done over T3. Between WebLogic Servers, and between programmatic clients & a WebLogic Server cluster, T3 is mandated. To communicate between processes and WebLogic Server, the protocols HTTP and IIOP can be used and optional. The HTTP is used to communicate between a browser and a WebLogic Server. The IIOP is used to communicate between an Object Request Broker and WebLogic Server.
42. Question: The Tree View Pane of the WebLogic Console is Not Visible in My Browser. How Do I Enable It?
Answer: Enable the Sun Java Plug-In from the control panel.
43. Question: What is the MSI Mode in Weblogic How Can You Enable and Disable This Option?
Answer: MSI is nothing but Managed Server Independence.
By default, Managed Servers can function independently of the Administration Server. A Managed Server instance can start in MSI mode if the Administration Server is unavailable. Configure MSI mode from the Administration Console.
To start a Managed Server in MSI mode, perform the following:
Ensure that the Managed Server’s root directory contains the config subdirectory. If the config subdirectory does not exist, copy it from the Admin server’s root directory. Start the MS at command line or script.
44. Question: What is the MSI Mode in Weblogic How Can You Enable and Disable This Option?
Answer: MSI is nothing but Managed Server Independence.
By default, Managed Servers can function independently of the Administration Server. A Managed Server instance can start in MSI mode if the Administration Server is unavailable. Configure MSI mode from the Administration Console.
To start a Managed Server in MSI mode, perform the following:
Ensure that the Managed Server’s root directory contains the config subdirectory. If the config subdirectory does not exist, copy it from the Admin server’s root directory. Start the MS at command line or script.
45. Question: What is JVM Tuning?
Answer: Middleware performance is directly related to JVM Tuning. Due to incorrect JVM Tuning, we may face OutOfMemory, High CPU, StuckThread, Server Crash kind of issues. There is no standard value available for JVM Tuning which can be suggested so that a JVM can be called as 100% tuned because the JVM tuning totally depends on the Platform (Operating System), The Number of CPUs, The nature of Application (Like how many objects it creates?
How Many Long Living Objects? How it implements the Caching of Objects? …etc). But if we will keep following things in mind while tuning the JVM then it may be really helpful.
Here are some very basic tips for tuning the JVM. Whatever Values of different JVM tuning parameters we are going to see and discuss in this article is not an absolute value, it may vary according to your environmental setup and requirement.
46. Question: What is Core Server Tuning?
Answer: This is the process involving the tuning of work manager, chuck size, performance packs, chunk pool size, and connection backlog buffering.
47. Question: What is OS Tuning?
Answer: This chapter describes how to tune your operating system for WebLogic Server 10.3.6. Proper OS tuning improves system performance by preventing the occurrence of error conditions. Operating system error conditions always degrade performance. Typically most error conditions are TCP tuning parameter related and are caused by the operating system’s failure to release old sockets from a close_wait call. Common errors are “connection refused”, “too many open files” on the server-side, and “address in use: connect” on the client-side.
In most cases, these errors can be prevented by adjusting the TCP wait_time value and the TCP queue size. Although users often find the need to make adjustments when using tunneling, OS tuning may be necessary for any protocol under sufficiently heavy loads.
Tune your operating system according to your operating system documentation. For Windows platforms, the default settings are usually sufficient. However, the Solaris and Linux platforms usually need to be tuned appropriately.
48. Question: What is Application Tuning?
Answer: Before spending a lot of effort to improve the performance of a program, use the techniques in this section to help determine how much its performance can be improved and to find the areas of the program where optimization and tuning will have the most benefit.
In general, the optimization process involves several steps:
Some tuning involves changing the source code, for example, by reordering statements and expressions. This technique is known as hand-tuning.
For FORTRAN and C programs, optimizing preprocessors are available to tune and otherwise transform source code before it is compiled. The output of these preprocessors is FORTRAN or C source code that has been optimized.
The FORTRAN or C++ compiler translates the source code into an intermediate language.
A code generator translates the intermediate code into machine language. The code generator can optimize the final executable code to speed it up, depending on the selected compiler options. You can increase the amount of optimization performed in this step by hand-tuning or preprocess first.
The speed increase is affected by two factors:
The amount of optimization applied to individual parts of the program
The frequency of use for those parts of the program at run time
Speeding up a single routine might speed up the program significantly if that routine performs the majority of the work, on the other hand, it might not improve overall performance much if the routine is rarely called and does not take long anyway. Keep this point in mind when evaluating the performance techniques and data, so that you focus on the techniques that are most valuable in your work.
49. Question: How Many WebLogic Servers Can Be Held Inside a Multi-Processor Machine?
Answer: There is no limitation for the number of servers.
50. Question: How to Find Out the Listening Ports?
Answer: How do I find out running processes were associated with each open port? How do I find out what process has open TCP port 111 or UDP port 7000 under Linux?
You can the following programs to find out about port numbers and its associated process:
1. netstat – a command-line tool that displays network connections, routing tables, and a number of network interface statistics.
2. fuser – a command-line tool to identify processes using files or sockets.
3. lsof – a command-line tool to list open files under Linux / UNIX to report a list of all open files and the processes that opened them.
4. /proc/$pid/ file system – Under Linux /proc includes a directory for each running process (including kernel processes) at /proc/PID, containing information about that process, notably including the processes name that opened the port.
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