1 Reply Latest reply on Mar 25, 2006 2:09 PM by Konrad Billewicz

    Pooling and caching stateful session bean

    Konrad Billewicz Newbie

      I would like to turn on pooling for my stateful session bean.

      When I'm trying to configure <container-configuration> with pooling but without cache I'm getting during bean deployment on server an error that <cache-policy-conf> is required.

      Whem I'm configuring cache, getting an exception (on the standalone client) during executing create() method on Home Interface:

      java.lang.NullPointerException
       at org.jboss.ejb.StatefulSessionContainer.createSession(StatefulSessionContainer.java:248)
       at org.jboss.ejb.StatefulSessionContainer.createHome(StatefulSessionContainer.java:323)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       ...
       at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
       at $Proxy0.create(Unknown Source)
       at com.example.client.HelloClient.main(HelloClient.java:31)
      


      I have prepared config files as follows:

      ejb-jar.xml:
      <enterprise-beans>
      
       <!-- Session Beans -->
       <session >
       <description><![CDATA[]]></description>
       <display-name>Hello</display-name>
      
       <ejb-name>Hello</ejb-name>
      
       <home>com.example.HelloHome</home>
       <remote>com.example.Hello</remote>
       <local-home>com.example.HelloLocalHome</local-home>
       <local>com.example.HelloLocal</local>
       <ejb-class>com.example.HelloBean</ejb-class>
       <session-type>Stateful</session-type>
       <transaction-type>Container</transaction-type>
      
       </session>
       ...


      jboss.xml:
      <enterprise-beans>
      
       <session>
       <ejb-name>Hello</ejb-name>
       <jndi-name>ejb/Hello</jndi-name>
       <local-jndi-name>HelloLocal</local-jndi-name>
       <configuration-name>Hello</configuration-name>
       <method-attributes>
       </method-attributes>
       </session>
       </enterprise-beans>
      
       <container-configurations>
       <container-configuration>
       <container-name>Hello</container-name>
       <instance-pool>org.jboss.ejb.plugins.StatefulSessionInstancePool</instance-pool>
       <instance-cache>org.jboss.ejb.plugins.StatefulSessionInstanceCache</instance-cache>
       <persistence-manager>org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager</persistence-manager>
       <container-pool-conf>
       <MaximumSize>3</MaximumSize>
       </container-pool-conf>
       <container-cache-conf>
       <cache-policy>org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy</cache-policy>
       <cache-policy-conf>
       <min-capacity>50</min-capacity>
       <max-capacity>1000000</max-capacity>
       <overager-period>300</overager-period>
       <max-bean-age>600</max-bean-age>
       <resizer-period>400</resizer-period>
       <max-cache-miss-period>60</max-cache-miss-period>
       <min-cache-miss-period>1</min-cache-miss-period>
       <cache-load-factor>0.75</cache-load-factor>
       </cache-policy-conf>
       </container-cache-conf>
       </container-configuration>
       </container-configurations>
      
       ...


      Have you any idea what can be wrong here? I had been working on it for several hours and haven't found any solution.

      Best regards,
      Konrad