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Problem to get custom interceptor stack up and running.
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created by <a href="http://community.jboss.org/people/heineson">Jonas Heineson</a> in <i>JBoss AOP</i> - <a href="http://community.jboss.org/message/536906#536906">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a problem getting an interceptor stack up and running on my JBoss (4.2.3.GA). The jboss starts fine, without any error messages, but when I connect a client to the server I get a NullPointerException suggesting that my Interceptor is not loaded (since it is the first one on the stack):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre jivemacro="wiki"><pre jivemacro="wiki"><p>...</p><p>Caused by: java.lang.NullPointerException<br/>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)<br/>    at org.jboss.ejb3.stateless.StatelessClusteredProxy.invoke(StatelessClusteredProxy.java:112)</p><p>...</p></pre>
</pre><p>The stack in question is a modified version of the default ClusteredStatelessSessionClientInterceptors stack defined in ejb3-interceptors-aop.xml:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>jboss-aop.xml:</p><p><span style="font-family: courier new,courier;">  <interceptor scope="PER_VM"/></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">  <stack name="MtClusteredStatelessSessionClientInterceptors"><br/>    <!--interceptor-ref name="org.jboss.ejb3.remoting.ClusteredIsLocalInterceptor"/-->    <br/>    <interceptor-ref name="com.computas.mt.jboss.clustering.FixedServerInterceptor"/><br/>    <interceptor-ref name="org.jboss.aspects.security.SecurityClientInterceptor"/><br/>    <interceptor-ref name="org.jboss.aspects.tx.ClientTxPropagationInterceptor"/><br/>    <interceptor-ref name="org.jboss.aspects.remoting.ClusterChooserInterceptor"/><br/>    <interceptor-ref name="org.jboss.aspects.remoting.InvokeRemoteInterceptor"/><br/>  </stack></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Annotations of SLSB class:</p><p><span style="font-family: courier new,courier;">@Stateless(name="EJBSingletonInvoker")<br/>@Clustered(loadBalancePolicy = FixedServerBalancer.class)<br/>@RemoteBinding(interceptorStack = "MtClusteredStatelessSessionClientInterceptors")<br/>public class MtEJBSingletonInvokerBean { ...}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Interceptor:</p><p><span style="font-family: courier new,courier;">public class FixedServerInterceptor extends ClusteredIsLocalInterceptor {<br/>  @Override<br/>  public Object invoke(Invocation invocation) throws Throwable {<br/>    // doing some extra stuff<br/>    return super.invoke(invocation);</span></p><p><span style="font-family: courier new,courier;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The jboss-aop.xml and the custom interceptor are both located in a module called mt-aop-<version>.aop which is in turn placed in an .ear together with the other modules of the application.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Have also turned on instrumentation in the jboss-aop-jdk50.deployer/META-INF/jboss-service.xml</p><p>What am I missing / doing wrong here?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Regards</p><p>Jonas Heineson</p></div>
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