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WithoutBook LIVE Mock Interviews JBoss Related interview subjects: 39

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Experienced / Expert level questions & answers

Ques 1

How to build clusters in JBoss?

Here is a nutshell summary from the example given for quick start: 
Execute from your jboss bin directory:
$ ./run.sh -c all -g DocsPartition -u 239.255.100.100 -b 192.168.0.101 -Djboss.messaging.ServerPeerID=1
  • ./run.sh = the executable
  • -c all = use server in jboss_home/server/all directory
  • -g DocsPartition = this is the partition name, use whatever but should be the same across nodes
  • -u 239.255.100.100 = this is the multicast address, ususally just pick anything in the 239.255.x.y range and you should be ok
  • -b 192.168.0.101 = this is the ip of the machine the node is on
  • -Djboss.messaging.ServerPeerID=1 = this is the peerid, it must be unique for each node.
So the start script that you would run on your second machine for the second node would look like:
$ ./run.sh -c all-node2 -g DocsPartition -u 239.255.100.100 -b 192.168.0.102 -Djboss.messaging.ServerPeerID=2
You can also use nohup to send the process to the background.
Now that both nodes should be running, you have to enable and configure the sticky sessions on the webserver and each server.
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Ques 2

What's JBoss cache in short?

JBossCache enables easy distribution of datasets across your computing environments. It is based on JGroups and enables clustering and high availability of that data. You may choose to distribute the data with JBoss Messaging to move it where it is needed for computation or event-based programming.
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Ques 3

Which component handles cluster communication in JBoss?

The JGroups framework provides services to enable peer-to-peer communications between nodes in a cluster. It is built on top a stack of network communication protocols that provide transport, discovery, reliability and failure detection, and cluster membership management services.
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Ques 4

Is it possible to put a JBoss server instance into multiple cluster at the same time?

It is technically possible to put a JBoss server instance into multiple clusters at the same time, this practice is generally not recommended, as it increases the management complexity.
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Ques 5

What's JBoss JBPM?

JBoss JBPM is a platform for process languages. At the base there is a java library to define and execute graphs. The actual process constructs like e.g. send email, user task and update database are defined on top of this. Every process language is made up of a set of such process constructs. And that is what is pluggable in this base library. On top of the JBoss jBPM base library, there are implemented several process languages as a set of process constructs: jPDL, BPEL and SEAM pageflow:
  • jPDL is a process language with a clean interface to Java and very sophisticated task management capabilities. There is no standard for Java process languages, so it is proprietary.
  • BPEL is a service orchestration language. As said before, in BPEL, you can write new services as a function of other services. This is typically a component of an Enterprise Service Bus (ESB).
  • SEAM pageflow is a language that allows for the graphically define the navigation between pages in a SEAM web application.
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Ques 6

What is about Seam?

  • Built on the standards JavaServer Faces and EJB 3.0, JBoss Seam unifies component and programming models and delivers a consistent and powerful framework for rapid creation of web applications with Java EE 5.0. 
  • Seam simplifies web application development and enables new functionality that was difficult to implement by hand before, such as stateful conversations, multi-window operation, and handling concurrent fine-grained AJAX requests. 
  • Seam also unifies and integrates popular open source technologies like Facelets, Hibernate, iText, and Lucene.
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Ques 8

What version of JBoss AS do I need to run Seam?

  • For Seam 1.3: Seam was developed against JBoss 4.2. Seam can still be run against JBoss 4.0. The seam documentation contains instructions for configuring JBoss 4.0.
  • rnFor Seam 1.2: Since Seam requires the latest edition of EJB3, you need to install JBoss AS from the latest JEMS installer. Make sure that you select the "ejb3" or "ejb3+clustering" profile to include EJB3 support. Also, the jboss-seam.jar library file from the Seam distribution must be included in each Seam application you deploy. Refer to examples in Seam distribution (inside the examples directory) to see how to build and package Seam applications.
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Ques 9

Can I run Seam outside of JBoss AS?

Yes, you can run Seam applications in plain Tomcat 5.5+ or in the Sun GlassFish application server.
To run Seam application in Tomcat, you need a number of additional library files and a few configuration files to bootstrap the JBoss EJB3 inside Tomcat. Please refer to the deploy.tomcat ANT build target for the Seam booking example (in the examples/booking directory of the Seam distribution) for more on how to build a Tomcat WAR for Seam applications.
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Ques 10

Can I run Seam in a J2EE environment?

Yes, as of Seam 1.1, you can use Seam in any J2EE application server, with one caveat: you will not be able to use EJB 3.0 session beans. However, you can use either Hibernate or JPA for persistence, and you can use Seam JavaBean components instead of session beans.
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