[jboss-user] [JBoss AOP] - Client interceptor giving an NPE

adamw do-not-reply at jboss.com
Wed Apr 29 21:09:20 EDT 2009


I've already posted on the EJB3 forum, but didn't get any replies there, so I thought that maybe on the AOP forum I'll have more luck. If any of you get this post twice,  sorry :)

First, my setup. I have an .ear application, deployed on one jboss instance (4.2.3), which contains an EJB with a remote interface.

I also have a web application, deployed on another jboss instance (also 4.2.3), which calls a method on the EJB.

Now, I'd like to add a client interceptor. I found a testcase in the ejb3 module of jbossas svn, but I must be missing some crucial step :).

The client interceptor class is very simple and is deployed both with the .ear and .war (on both jbosses) in /lib:

  | public class CustomInterceptor implements Interceptor, Serializable {
  |   private static final long serialVersionUID = 3228182870246296423L;
  |   public String getName() { return "Custom interceptor"; }
  |   public Object invoke(Invocation invocation) throws Throwable {
  |     System.out.println("!!! INTERCEPTING !!!");
  |     invocation.getMetaData().addMetaData("jboss.ejb3.client.invocation.metadata", "xxx", "yyy", PayloadKey.AS_IS);
  |     return invocation.invokeNext();
  |   }
  | }

To bind the interceptor with the bean, I deploy a jboss-aop.xml file (in the .ear), which has the following:

  | <aop xmlns="urn:jboss:aop-beans:1.0">
  |    <interceptor class="example.CustomInterceptor" scope="PER_VM"/>
  |    <stack name="CustomStatelessSessionClientInterceptors">
  |       <interceptor-ref name="org.jboss.ejb3.remoting.IsLocalInterceptor"/>
  |       <interceptor-ref name="org.jboss.aspects.security.SecurityClientInterceptor"/>
  |       <interceptor-ref name="org.jboss.aspects.tx.ClientTxPropagationInterceptor"/>
  |       <interceptor-ref name="example.CustomInterceptor"/>
  |       <interceptor-ref name="org.jboss.aspects.remoting.InvokeRemoteInterceptor"/>
  |    </stack>
  | </aop>

Also, on the bean class, I have the @RemoteBinding annotation, as in the testcase:

  | @Stateless
  | @RemoteBinding(interceptorStack="CustomStatelessSessionClientInterceptors")
  | public class HelloBean implements LocalHello, RemoteHello, Hello {
  | ...
  | }

Everything deploys fine, however when I invoke a bean's method from the client web application, I get the following exception:

  | java.lang.NullPointerException
  | 	org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
  | 	org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
  | 	org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
  | 	org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
  | 	org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
  | 	$Proxy58.printToSysOut(Unknown Source)
  | 	client.ClientServlet.doGet(ClientServlet.java:47)
  | 	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
  | 	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  | 	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

Looks like the first three interceptors work fine, but then it fails on mine. Any ideas what can be wrong? I don't see any special messages when deploying.


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