Replicating session in JBoss 

In this tutorial, we will see how to do Session replication in Weblogic Cluster You now need to use the node1 and node2 created before In session-test.war/WEB-INF/web.xml, add:

  <web-app>

  <display-name>Session Test</display-name>

  <description>...</description>

  <distributable/> <!--  -->

  ...

</web-app>

Now:

• Disable sticky sessions (optional)
• Redeploy session-test.war to node1/deploy and node2/deploy directories
• Restart and retest You can now see that your application is fault-tolerant, it supports failover AND state replication Problems with sticky sessions?
• Uneven distribution of load
• If one instance goes down, all of its sessions go with it

You can configure session replication here:

• Sessions are replicated by all/deploy/cluster/jboss-cache-manager.sar:
• Cache Mode: REPL_SYNC, REPL_ASYNC
• Caching Configuration: replication queue
• Cluster Name and Configuration: communication

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• Configure session replication per app in WEB-INF/jboss-web.xml

Replication trigger: SET, SET_AND_GET, SET_AND_NON_PRIMITIVE_GET, ACCESS

Replication granularity: SESSION, ATTRIBUTE, FIELD

deploy/cluster/jboss-cache-manager.sar/META-INF/jboss-cache-manager-jboss-beans.xml:

<deployment ...>

  ...

 <bean name="CacheConfigurationRegistry" ...>

  ...

 <property name="newConfigurations">

  <map keyClass="java.lang.String" valueClass="org.jboss.cache.config.Configuration">

  <entry><key>standard-session-cache</key>

   <value>

   <bean name="StandardSessionCacheConfig" class="org.jboss.cache.config.Configuration">

    ...

   <property name="clusterName">${jboss.partition.name:DefaultPartition}-SessionCache</property>

    <property name="multiplexerStack">${jboss.default.jgroups.stack:udp}</property>

    <property name="fetchInMemoryState">true</property>

    <property name="nodeLockingScheme">PESSIMISTIC</property>

    <property name="isolationLevel">REPEATABLE_READ</property>

     <property name="useLockStriping">false</property>

     <property name="cacheMode">REPL_ASYNC</property>

     <property name="syncReplTimeout">17500</property>

     <property name="lockAcquisitionTimeout">15000</property>

       ...

     </bean>

     </value>

     </entry>

     ...

    </map>

    </property>

    ...

   </bean>

   ...

   </deployment>

You can also specify for each application some parameters: WEB-INF/jboss-web.xml:

<jboss-web>

 <replication-config>

 <replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger>

 <replication-granularity>SESSION</replication-granularity>

 </replication-config>

 </jboss-web>

For indepth understanding on JBoss click on:

• JBoss architecture
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• Advanced Java Training in Houston
• Session Configuration
• JBoss Tutorials
• JBoss Overview