WebLogic Tutorial for Beginners

WebLogic Tutorial for Beginners from svr technologies by 12+ years experienced faculty. 30+ Tutorial videos & 100+ interview questions and answers.

Weblogic Tutorial Videos

You, Will, Learn in Weblogic Tutorial

1. Question: How to Handle Out of Memory in Weblogic and If Server is Getting More Requests Then What We Have to do in Production Environment?

Answer: Whenever we face the issue of Out of memory in WebLogic following steps can be taken care

1. Check the heap size of the memory in the server

2. Check the CPU and memory(%) of the server if its getting hiked during the issue.

3. Check if there are any memory linkages happening on the server

4. Check the logs if any of the application running on the server causing the issue like any SQL query or any particular functionality of an application causing an issue.

5. Check the thread dumps in the logs.

6. If some application functionality or query is causing the issue then the code needs to be fine-tuned and even at the code level, we need to make sure that objects that are getting created are destroyed.

Through the above-mentioned points we can find out the root cause of OOM and can fix it.

If the server is getting more requests we can do the load balancing on the server by having distributed on different ports on the same server. 

2. Question: How Can We Handle If Server is Hang and How to Handle Out of Memory in Weblogic?

Answer: When a Server is hanging, we can ping the server using java WebLogic.Admin t3://server: port PING. If the server can respond to the ping, it may be that the application is hanging and not the server itself. weblogic interview questions,
WebLogic administration interview questions,
WebLogic administrator interview questions,
what is WebLogic,
what is WebLogic server,

We can use -verbose GC flag to check whether the server is doing the proper garbage collection or not.

Also, we can analyze the thread dumps to check out which thread is actually stocking. 

3. Question: Which is the Best Tool For Monitoring Weblogic Server(WLS8)?

Answer: WLS8 supports JMX but it uses WebLogic implementation of the JMX server. It does not supports generalize sun javax API which can be used with any JVM. There are some patches available that can be used with WLS8 which will enable JMX based monitoring. Once JMX is enabled there are many monitoring tools available in the market. One can even go for custom JMX utilities which can be used for server monitoring.

4. Question: How to Monitor WebLogic Using WLST?

Answer: First you need to connect to the admin server. then you can use any Runtime MBean. (How to Monitor WebLogic Using WLST)

Using WLST we can monitor various Runtime MBeans such as ThreadPool, JVM, JDBC ConnectionPool, JMS Server and Server Life Cycle for the state of a WebLogic server instance.

5. Question: How Weblogic Server Instance Methods to Communicate in a Cluster and How Server Detect Failure?

Answer: Weblogic server instance in a cluster communicate with the following network technologies:

1)Sockets Communication

2)Heart Beat Communication

Socket Communication:

(one to one or peer to peer) each server instance will communicate with IP socket programming for sharing the information.

Heart Beat Communication:

each server will communicate with the cluster by sending the heartbeat for every 10 sec. If it does not receive a heartbeat from the server for 30 seconds or longer, the monitoring server makes the peer server as “failed”. 

6. Question: What is Garbage Collection?

Answer: Garbage collection (GC) is a dynamic approach to automatic memory management and heap allocation that processes and identifies dead memory blocks and reallocates storage for reuse. The primary purpose of garbage collection is to reduce memory leaks. 

GC implementation requires three primary approaches, as follows:

  • Mark-and-sweep – In the process when memory runs out, the GC locates all accessible memory and then reclaims available memory.
  • Reference counting – Allocated objects contain a reference count of the referencing number. When the memory count is zero, the object is garbage and is then destroyed. The freed memory returns to the memory heap.
  • Copy collection – There are two memory partitions. If the first partition is full, the GC locates all accessible data structures and copies them to the second partition, compacting memory after the GC process and allowing continuous free memory.

Some programming languages and platforms with built-in GC (e.g., Java, Lisp, C# and .Net) self-manage memory leaks, allowing for more efficient programming.

7. Question: Components of JNDI?

Answer: JNDI provides both an API for almost all software developers and a Service Provider Interface (SPI) for the underlying service providers. Java applications sit on top of the JNDI API framework, providing access to the Service Provider Interface (SPI) and JNDI classes. The Service Providers then provide access to the naming systems in a 1-to-1 relationship.

The JNDI framework API is contained in three interface packages:

  • Naming Interface in the javax.naming package, which provides the naming operations.
  • Directory Interface in the javax.naming.directory package, which provides the directory operations.
  • Service Provider Interface in the javax.naming.spi package, which contains the SPI. 

8. Question: How Do I Use Multibyte Character Sets With WebLogic JDriver For Informix?

Answer: Currently, multibyte character sets are not supported for the WebLogic driver for Informix driver. Support may be added in a future release. For more information, read about codeset support in Using WebLogic driver for Informix.

9. Question: WebLogic – How Do Clients Handle DNS Requests to Failed Servers?

Answer: If a server fails and DNS continues to send requests to the unavailable machine, this can waste bandwidth. For a Java client application, this problem occurs only during startup. WebLogic Server caches the DNS entries and removes the unavailable ones, to prevent the client from accessing a failed server twice. 

Failed servers can be more of a problem for browser-based clients because they always use DNS. To avoid unnecessary DNS requests with browser-based clients, use a third-party load-balancer such as Resonate, BigIP, Alteon, and LocalDirector. These products mask multiple DNS addresses as a single address. They also provide more sophisticated load-balancing options than round-robin, and they keep track of failed servers to avoid routing unnecessary requests. 

10. Question: What is dev2dev Support?

Answer: BEA now offers dev2dev Support for WebLogic Express customers. BEA dev2dev Support provides comprehensive Web-based support for easier and more productive implementations so you can meet your project goals. Developers have access to extensive online technical information, best practices, and automated online help request services – all allowing you to tap into the expertise of BEA Support. 

Dev2dev Support is an additional offering to the pre-existing Production Support offering from BEA. BEA Production Support is a more comprehensive offering, ensuring your key business processes are up and running. Combining a 24×7 response for faster problem resolution with proactive services to leverage best practices, BEA Production Support improves your IT team’s productivity. The BEA Production Support offering allows all members of your team access to BEA expertise through phone or Web, as well as full access to online self-help resources. 

11. Question: Can I Use WebLogic Express as a Web Server?

Answer: Yes, WebLogic Express has complete Web server functionality. This allows a Web browser to request pages from WebLogic Express using standard HTTP protocol. Used as a Web server, WebLogic Express supports several standard features like security, SSL, virtual hosting, Proxy configurations, load balancing, and automatic failover. For more information on WebLogic Express as a Web server refer to WebLogic Server Services.  

12. Question: How Does WebLogic Express Integrate With My IDE?

Answer: WebLogic Express can work with various third party modeling, development and testing tools. For information on tools support and integration, kits see Tools and Utilities for WebLogic Server 8.1.  

13. Question: How Does the Console Differ Between WebLogic Express and WebLogic Server?

Answer: There is no difference between the WebLogic Express and WebLogic Server console.

14. Question: Can I Build Web Services With WebLogic Express If So, How?

Answer: Yes, you can build and deploy Web Services in WebLogic Express using Java classes. See Overview of WebLogic Web Services for instructions on building Web services for WebLogic Express. Note that in WebLogic Express you can only use Java classes to implement Web services. You cannot use EJBs or JMS.

15. Question: How Should I Use the Existing BEA e-docs If I am a WebLogic Express User?

Answer: BEA has provided a separate eDocs page for WebLogic Express. This page provides links to most of the documentation related to WebLogic Express features installation, programming, management, and “Getting Started” material. You will find that many of the links in the WebLogic Express documentation pages actually point to WebLogic Server documentation pages. This is because WebLogic Express shares the same code base as WebLogic Server and WebLogic Server documentation for common WebLogic Server/WebLogic Express features can be applied to WebLogic Express.

16. Question: When Should I Upgrade From WebLogic Express to WebLogic Server?

Answer: WebLogic Express is a good fit for less complex applications built on Servlets, JSPs, Java objects, and simple data access. You can use RMI for client-server and client-client communication, and even build basic Web Services using these technologies.

Reasons to migrate to WebLogic Server from WebLogic Express could include the following:

  • Your application needs an upgrade – Perhaps you need to repartition your application layers to create a separate business logic/EJB layer to meet certain business needs or to manage architecture complexity.
  • You need to integrate with other applications supported by JCA adapters.
  • You need a messaging infrastructure (i.e., JMS) for your application.
  • You need some of the more advanced features that come with WebLogic Server such as two-phase commit transactions, message-driven beans, and object tier clustering and caching. 

17. Question:  I Get a Java.Lang.LinkageError Exception When I Use Ant to Run a Client Application That Uses the WebLogic JAXP Implementation. What is the Problem?

Answer: The problem might have to do with Ant classloading. The workaround is to fork the VM by setting the fork=” true” attribute of the javac Ant task while running the application.

The full text of the error is as follows:

[java] java.lang.LinkageError: loader constraints violated when linking org /xml/sax/InputSource class
[java] at weblogic.xml.jaxp.RegistryDocumentBuilderFactory.newDocumentBuilder(RegistryDocumentBuilderFactory.java:128).

18. Question: What Version of the JAXP API Specification is Implemented in WebLogic Server 8.1?

Answer: Version 1.1. This version includes pluggable XML transformation as well as pluggable XML parsing.

19. Question: Is There an XSLT Processor Included in WebLogic Server 8.1?

Answer: Yes, the one that ships in the JDK 1.4.1_02: Apache’s Xalan 2.2D11. This is the built-in XSLT processor for WebLogic Server 8.1. 

20. Question:  Which XML Parser Comes With WebLogic Server 8.1?

Answer: We bundle the following two parsers with WebLogic Server 8.1: 

  • a built-in parser based on Apache’s Xerces 2.1.0 parser
  • WebLogic FastParser, a high-performance non-validating parser that you can use for small to medium-sized XML documents.

The WebLogic XML Registry allows you to configure the parser you want to use for specific document types.

You can also use the WebLogic XML Streaming API to parse your XML documents. The Streaming API is based on the SAX API but provides a more procedural, stream-based handling of XML documents rather than having to write SAX event handlers, which can get complicated when dealing with complex XML documents.

21. Question: What is WAP and What is i-Mode?

Answer: WAP and i-Mode are the two major over-the-air (OTA) protocols for wireless Internet communication with cell phones and some other devices. WAP stands for Wireless Application Protocol and is found predominantly in Europe and North America.  i-Mode is the protocol used in Japan by NTT DoCoMo. A new protocol called WAP-NG (WAP Next Generation) is being considered as a replacement for both of these protocols.

Both WAP and i-Mode are comprised of both the OTA protocol and a markup language understood by their microbrowsers. The WAP markup language is WML (Wireless Markup Language) and HTML (Compact HTML) is the markup language specified by i-Mode. WML and HTML may be superseded by XHTML (Basic) in the future.

Note that other wireless carriers and devices use protocols and markup languages other than WAP and i-Mode. For example, the Palm VII uses web clipping over a proprietary protocol. 

22. Question: Can WebLogic Server Support Wireless Devices?

Answer: Yes. For information on wireless support, see Using WAP with WebLogic Server. Wireless examples, if installed, are located in the /samples/examples directory of your WebLogicServer installation and are available from the Start menu.

23. Question: What is a Wireless (Mobile) Device?

Answer: A wireless device in this context is a device that has connectivity to the Internet without being physically plugged into a network with a wire. The most common examples of these are Internet-enabled cell phones such as a WAP Phone or i-Mode phone, personal digital assistant (PDA) such as Palm VII, Pocket PC such as Wireless iPaq, and pager such as RIM Blackberry. (E learning)

24. Question: Does WebLogic Server 8.1 Support SOAP?

Answer: Yes. WebLogic Server’s implementation of SOAP is included as part of the Web Services subsystem.

25. Question: Does WebLogic Server 8.1 Support SOAP Messages With Attachments?

Answer: Yes. As long as the data type of the attachment is on the list of supported JAX-RPC data types, then WebLogic Server will automatically handle parameters to Web services that are SOAP attachments. If you want to do further processing of the attachment, you can use handlers to intercept the request and response SOAP message.

26. Question: Why Do I Keep Getting a NoSuchMethodError When Running an Application on WebLogic Server 8.1?

Answer: Make sure that you are not running the server with a patch for a previous version of WebLogic Server. For exact information on a particular patch, contact Customer Support. 

Also make sure that you do not have any JAR files in your server CLASSPATH that conflict with the version of J2EE that is supported by WebLogic Server 8.1, J2EE version 1.3. The 1.3 version of J2EE is added to the WebLogic Server 8.1 CLASSPATH by default. For example, you may have to remove j2ee12.jar from your server CLASSPATH.

27. Question: How Do I Run WebLogic Server 8.1 in Compatibility Mode When Upgrading?

Answer: WebLogic Server 8.1 recognizes your old config.xml file and automatically runs in Compatibility mode.

28. Question: What is Compatibility Mode?

Answer: When you upgrade to WebLogic Server 8.1 from previous versions of WebLogic Server, Compatibility mode allows you to keep your old configuration of users, groups, and ACLs.

29. Question: When Using the WebLogic Credential Mapping Provider, How Do You Create Mappings For Anonymous or Unauthenticated Users?

Answer: When using the Resource container, special usernames are established for different cases. A mapping called wls_ra_anonymous is used when there is not authenticated WebLogic user (meaning, the Subject has no users or is null). The Resource container also defines special mappings for mappings created during a Resource Adapter’s pool startup (wls_ra_initial) and when no other configured mapping applies to the given Subject.

30. Question: Why Do I Get a Configuration Error When Establishing an SSL Connection to WebLogic Server?

Answer: By default, WebLogic Server contains a Hostname Verifier that compares the subject DNS of digital certificates and hostnames. When establishing an SSL connection, the subject DN of the digital certificate must match the hostname of the server initiating the SSL connection. If you use the demonstration certificates the host names will not match. To avoid this situation, use the following command-line argument when starting WebLogic Server: 

Dweblogic.security.SSL.ignoreHostnameVerification=true

This argument disables the Hostname Verifier. This solution is recommended in development environments only.

A more secure solution is to obtain a new digital certificate for your WebLogic client.

In this release of WebLogic Server, WebLogic clients perform a trusted certificate authority check on the digital certificate for WebLogic Server. The client may reject the digital certificate of WebLogic Server if the certificate was not issued by a certificate authority trusted by the client. Previous versions of WebLogic Server did not perform this check. 

31. Question: Why Do I Get a Certificate Configuration Error When I Start the My Weblogic Server?

Answer: It is possible that you did not specify a WL_HOME relative file name in your SSL configuration files. 

32. Question: Can I Use a JNDI Initial Context to Pass the Security Credentials of a WebLogic Server User?

Answer: The ability to use JNDI to pass security credentials was deprecated in 6.1 of WebLogic Server. You can still use this method in this release WebLogic Server. However,  BEA recommends using the Java Authentication and Authorization Service (JAAS) run() method rather than JNDI to associate a user with a security context.

33. Question: Can a Weblogic Server Deployment Have One RSA and One Non-RSA Certificate?

Answer: No.   (Can a Weblogic Server Deployment Have One RSA and One Non-RSA Certificate)

34. Question: Does WebLogic Server Support Diffie-Hellman or DSS/DSA Digital Certificates?

Answer: No. The exportable version of WebLogic supports only 512 bit RSA with 40 bit RC4. Additionally, Web browsers do not support these types of certificates, and there are no commercial issuers for DSA certificates. 

35. Question: I am using the 6.x Security Realm APIs in My Application. How Do I Upgrade This Functionality to the Security APIs in This Release of WebLogic Server?

Answer: You can use your 6.x application as is in the WebLogic Server environment by using Compatibility security. 

The management of WebLogic Server changed in 6.x away from direct calls on the realm to the use of MBeans. This change was the first step in creating a unified administration model for WebLogic Server. While the Security MBeans introduced in 6.x mirrored the capabilities defined for the realm, they were not flexible enough to allow security vendors to integrate their products with WebLogic Server. This release of WebLogic Server provides a set of Security Service Provider Interfaces (SSPI) and Security SPI MBeans that allow you to write custom security products for WebLogic Server. These MBeans can also be used to replicate functionality in an existing application so that the application can be used in the WebLogic Server environment.

If you choose to upgrade your realm, you will need to write an implementation of the MBeans found in the weblogic.management.security package. These MBeans allow you to implement management methods that are specific to your 6.x realm. For a description of using the MBeans in the weblogic.management.security package, see Developing Security Providers for WebLogic Server.

The following are some hints that may help you upgrade applications based on security realms to the security architecture available in this release of WebLogic Server:

    • If you are using the security realm to authenticate users, instead use the JAAS API to authenticate users.
    • Table 20-1 lists the mappings between the interfaces in the 6.x of the weblogic.security.acl package to the interfaces in the weblogic.managment.security.authentication package. 

Note: The weblogic.security.acl package is deprecated in this release of WebLogic Server.

36. Question: How Can I Run Multiple Instances of the Same Servlet Class in the Same WebLogic Server Instance?

Answer: If you want to run multiple instances, your servlet will have to implement the SingleThreadModel interface. An instance of a class that implements the SingleThreadModel interface is guaranteed not to be invoked by multiple threads simultaneously. Multiple instances of a SingleThreadModel interface are used to service simultaneous requests, each running in a single thread.

When designing your servlet, consider how you use shared resources outside of the servlet class such as file and database access. Because there are multiple instances of servlets that are identical and may use exactly the same resources, there are still synchronization and sharing issues that must be resolved, even if you do implement the SingleThreadModel interface.

37. Question: How Can I Debug the Java Code That I Have Running in WebLogic Server?

Answer: You can use tools such as WebGain, JBuilder, NetBeans and JDB that rely on the Java Platform Debugger Architecture (JPDA) to debug your Java code running in WebLogic Server.

JPDA is integrated into the Java 2 Platform, Standard Edition (J2SE) SDK 1.3 on all platforms and SDK 1.2.2 for Linux. There is a download available from Sun to add JPDA support to the J2SE SDK 1.2.2 on Solaris and Microsoft Window platforms. If you are using J2SE SDK 1.2.2 on these platforms you must first get this download. 

To allow a debugger to attach to the virtual machine that WebLogic runs you have to start WebLogic in debug mode. In order to start WebLogic in debug mode using a Sun virtual machine follow these steps (start with step one only if using a Solaris platform):

1. If using a Solaris platform, change the LD_LIBRARY_PATH environment variable to prepend $JAVA_HOME/lib/sparc:

export LD_LIBRARY_PATH=$JAVA_HOME/lib/sparc:$LD_LIBRARY_PATH

2. Add the following parameters to the java command line (before the “weblogic.Server” string) that launches the WebLogic server:

-Xdebug
-No agent
-Xrunjdwp:transport=dt_socket
server=y
address= suspend=n
-Djava.compiler=NONE

Note that with the Hotspot Performance engine the -Xnoagent and -Djava.compiler=NONE options are no longer required but are accepted and ignored for compatibility reasons.

If server=y and no address parameter is supplied, WebLogic Server chooses the transport address and prints it to the standard output stream. So, if a line such as:

Listening for transport dt_socket at the address: 46666

prints in your standard output stream when the server starts, the number 46666 is the port number to be supplied to your tool’s remote debugger in order to attach it to WebLogic’s virtual machine.

38. Question: What is New For Debugging a Plug-in in WebLogic Server 6.0?

Answer:
“Debug = ON” logs only informational and error messages
HFC: headers from the client, informational, and error messages
HTW: headers sent to was, informational and error messages
HFW: headers sent from was, informational and error messages
HTC: headers sent to the client, informational and error messages
ALL: everything
OFF: nothing — default(should be used in production)

The log file is configurable for 6.1. For later versions of WebLogic Server, the WLLogFile was introduced to configure the debug filename and location.

39. Question: What XA Drivers Can I Use in Addition to the WebLogic JDriver For Oracle/XA?

Answer: Theoretically, you can use any third party XA driver that is compliant with the JDBC 2.0 standard extension specification with WLS. However, an individual vendor’s XA driver may have bugs that prevent it from working properly.

Refer to JDBC Configuration guidelines for details about how to configure them at Using Third-Party Drivers with WebLogic Server in Programming WebLogic JDBC.

40. Question: How Can I Incorporate MQSeries as an XA Resource For Distributed Transactions in WebLogic Server?

Answer: You can download a zip file with instructions, support classes, utilities, and an example from the code samples for the WebLogic server page on BEA’s dev2dev site. You can also directly download the package from ftp://edownload:BUY_ME@ftpna2.bea.com/pub/downloads/wlsmqseries.zip.

41. Question: Can the Messaging Bridge Forward Durable Subscription Messages Between Separate WebLogic Server 6.1 and Release 7.0 or Later Domains?

Answer: Yes, as long as the domain hosting the bridge is using WebLogic 7.0 Service Pack 1 or later.  To enable durable messages across the messaging bridge using the Administration Console, select the Durability Enabled attribute on the Messaging Bridge —> Configuration —> General tab.

42. Question: I Deployed the Transactional jms-xa-adp.rar Resource Adapter On the WebLogic 8.1 Domain Where the Message Bridge is Running, But I Still Get a Failed to Find Bridge Adapter Message?

Answer: You need to associate both the source and target bridge destinations with the appropriate.rar adapters in order for the bridge to communicate with them. For the jms-xa-adp.rar transaction adapter, it must be identified in the Adapter JNDI Name attribute as eis.jms.WLSConnectionFactoryJNDIXA on the JMS Bridge Destination —> Configuration tab for both the source and target bridge destinations.

Note: The “failed to find a bridge adapter” message does not necessarily indicate a problem if it only occurs once. However, if it occurs repeatedly, you should check the adapter deployment and the adapter JNDI name used in the source and target bridge destinations.

43. Question: Why Do I Get a Security Authorization Exception When Attempting to forwarding Messages From a WebLogic Server 7.0 GA, SP01, or SP02 Destination to a Release 6.1 Destination?

Answer: In WebLogic Server 6.1, the trust relationship between two WebLogic Server domains was established in the system password was the same in both domains. For a release 7.0 GA, SP01, and SP02 messaging bridge to communicate with a release 6.1 domain, you must establish a trusted relationship across release the 6.1 and 7.0 domains. A trusted relationship is established when the Credential attribute for one domain matches the Credential attribute for another domain. Therefore, if you want a release 6.1 domain to interoperate with a release 7.0 SP02 or earlier domain, you need to change the Credential attribute in both domains to the password of the “system” user in the release 6.1 domain. 

44. Question: Can the Messaging Bridge Handle Two-Phase or Global Transactions Between Separate WebLogic Server Domains or Between Different Releases?

Answer: Yes, as long as the communication is between source and target WebLogic domains that are both running release 6.1 SP03 or later, and the bridge is configured to use the Exactly-once quality of service. 

45. Question: How Do I Use Non-WebLogic JMS Provider Destinations to Drive MDBs?

Answer: See the “Using Foreign JMS Providers with WebLogic Server” white paper (jmsproviders.pdf) for a discussion on this topic. 

46. Question: How Do I Handle Request/Response Using WebLogic JMS?

Answer: There are several approaches to handling request/response processing with JMS. (How Do I Handle Request/Response Using WebLogic JMS)

Use a temporary queue for each requestor and have the response go back to that queue.
Use the QueueRequestor class, which does the temporary queue for you, and wait for the reply, as in the following:

// create temporary queue for receiving answer
qrequestor = new QueueRequestor(qsession, queue);
TextMessage msg = qsession.createTextMessage();
TextMessage reply = (TextMessage) 

qrequestor.request(msg);

Use a dedicated response topic or queue with message selectors.

47. Question: How Do I Use a Startup Class to Initialize and Later Reference WebLogic JMS Objects?

Answer: This topic is covered in news://newsgroups.bea.com/3ad0d7f3@newsgroups.bea.com. The sample code does not cleanup properly at shutdown. You can use a shutdown class that does something like the following:

JMSobject WLSobject = null; 
try 
WLSobject = JMSStartUp.getJMSobject();
WLSobject.JMSCleanup();
} catch(Exception e) {}

Load-on-start servlets can provide a nice solution to provide both initialization and cleanup. 

48. Question: How Do I Use WebLogic JMS in an Applet?

Answer: Oracle’s complete family of application infrastructure products—from the #1 Java application server to SOA and enterprise portals—are integrated with Oracle Applications and technologies to speed implementation and lower the cost of management and change. Best-of-breed offerings and unique hot-pluggable capabilities provide a foundation for innovation and extend the business value of existing investments.

This comprehensive family of products is now even more seamlessly integrated to help you create, run, and manage agile and intelligent business applications. Oracle Fusion Middleware 11g’s hot-pluggable architecture allows you to make the most of your current investments in applications and technology, while also taking advantage of modern hardware and software architectures. The goal of this release is to maximize your efficiency in both IT and business processes to give you the agility to adapt and innovate. Oracle Fusion Middleware 11g is the foundation for innovation. 

49. Question: What Care Must Be Taken When Multi-threading WebLogic JMS Clients?

Answer: The rules for multi-threading are described in section 2.8 of the JMS specification, with additional language in sections 4.4.6 on session usage, 4.4.9 on using multiple sessions, and 4.4.17 on concurrent message delivery. In a nutshell, it states that JMS sessions are single-threaded. Consequently, if multiple threads simultaneously access a session or one of its consumers or producers the resulting behavior is undefined. In addition, if multiple asynchronous consumers exist in a session, messages will be delivered to them in series and not in parallel.  

To take advantage of multiple threads with JMS, use multiple sessions. For example, to allow parallel synchronous to receive requests, design the application so that only one consumer may be active per session and use multiple sessions. 

50. Question: Why Do I Get an Exception When I Start Up WebLogic JMS Using an XA Driver or With a TX Data Source?

Answer: You cannot use a TX data source with JMS. JMS must use a JDBC connection pool that uses a non-XA resource driver (you can’t use an XA driver or a JTS driver).

Do not set the enable two-phase Commit option. JMS does the XA support above the JDBC driver.

What is Weblogic Course?

SVR Technologies Main Aim is to provide weblogic tutorial videos From India fast track for busy people and also Normal track for students and working professionals. SVR Technologies stand unique in providing live virtual Online global support and services like weblogic tutorial videos, with highly intellectual professional trainers and skilled resources predominantly in Infrastructure and management related technologies of weblogic tutorial videos. SVR Technologies has footprints virtually across and more by providing live virtual support services from India for fresh graduates, working professionals etc. Being a live virtual online training the support ,training and service methodology is just click away considerably reducing your TIME,INFRASTRUCTURE and Cost effective. We maximize the benefits of our depth, diversity and delivery capability, ensuring adaptability to software industry SVR Technologies strive to be globally recognized as a provider of a Trusted, Reliable Resource to Quality Training. To Provide the Finest Quality training that will evolve in step with the changes that takes place globally in the fields of Java to set New Qualitative standards in weblogic tutorial videos by Employing Innovative Approaches. Highlights of SVR Technologies: Domain experts, Flexible and up to date Course content, Real time case studies, Professional tools for web based training, Affordable pricing, Job Assistance.

Oracle Weblogic Course Overview

WebLogic server is based on Java 2 Platform, Enterprise Edition (J2EE), the standard platform used to create Java-based multi-tier enterprise applications. J2EE platform technologies were developed through the efforts of BEA Systems and other vendors in collaboration with the main developer, Sun Microsystems. Because J2EE applications are standardized modules, WebLogic can automate many system-level tasks that would otherwise have demanded programming time.The main features of WebLogic server include connectors that make it possible for any legacy application on any client to interoperate with server applications, Enterprise JavaBean (EJB) components, resource pooling, and connection sharing that make applications very scalable. An administration console with a user interface makes management tasks more efficient and features such as Secure Sockets Layer (SSL) support for the encryption of data transmissions, as well as authentication and authorization mechanisms, make applications and transactions secure. BEA Systems’ weblogic tutorial videos is a server software application that runs on a middle tier, between back-end databases and related applications and browser-based thin clients. WebLogic is a leading e-commerce online transaction processing (OLTP) platform, developed to connect users in a distributed computing environment and to facilitate the integration of mainframe applications with distributed corporate data and applications.

Job Opportunities on WebLogic

All are growing through weblogic tutorial videos. With recent significant wins, now we can see the opportunity to an unprecedented expansion in its weblogic tutorial videos Practice across every level in the solution development and service deployment life cycle and across all our major sectors – Financial Services, Public Sector, Commercial and Utilities. weblogic tutorial videos is the hottest piece of cake in the IT Industry today and it will be tomorrow. This Java developer course is an ideal platform for you to start learning weblogic tutorial videos and go on to explore more advanced features and ideas of Java in the future. There are more and more Companies who are migrating their applications from VB, .NET and other technologies to weblogic which leaves a huge empty space to be filled with weblogic tutorial videos and its technologies. A weblogic tutorial videos developer or weblogic Programmer career involves high level programming knowledge and long hard working hours. They are recruited in all the companies where Information Technology plays a major role, especially companies that has jobs with website development, database designing, software testing, cell phone programming, internet or intranet designing etc.

SVR Features

At SVR Technologies, we strive to make every resource available on Java J2EE Online Training, whether that means creating a virtual library or providing academic support and advice hours a day. The best way, though, to know if enrolling at weblogic tutorial videos is right for you is to understand what students experience when they attend online classes every day. weblogic tutorial videos at SVR Technologies are designed from the beginning to give you the tools to succeed, with all the class’s information and materials available to you from a week before the class even starts. Every online class is created based on a syllabus and presented online using an ordered, easy-to-follow framework. You can access any time any learn weblogic tutorial videos at SVR Technologies. As each online course progresses, you have access to all the notes, instructor lectures and chats you’ve engaged in up to that point, as well as all the weblogic online course materials. One of the most important parts of being successful while taking online courses is actively working with your peers. That’s why all of our web-based classes feature robust discussions threads and features.

Conclusion

The dialogue and interaction extends beyond your classmates; Professors are actively involved in weblogic tutorial videos class discussions and available to answer questions through phone and email. weblogic tutorial videos then shows how built on the Servlet architecture. Additionally, the weblogic online class shows students how to use, custom tags and expression language to reduce weblogic code in Web pages while adding tremendous power and capability to those pages. The class culminates in an exploration of MVC frameworks like Struts at a high level. weblogic tutorial videos is a verbose language, which at first can seem daunting. However, after learning the basics you’ll find that you can easily grab onto more advanced concepts because the code is very explicit. Plus, there are great courses out there that can ease you into this powerful language. At SVR Technologies, we specialize in providing total project support solutions to students, consultants and organizations across all Information Technologies, anywhere in the world. Through the implementation of a 24X7 live system and a force of technically savvy professionals, we are open to assist you in any phase of learning. So what are you waiting for? It’s time to weblogic tutorial videos.

Weblogic Videos

Duration: 20+ hours
5999/-
  • Experienced Faculty
  • Real-time Scenarios
  • Free Bundle Access
  • Course Next Version
  • Sample CV/Resume
  • Interview Q&A