Problems creating a Retry Interceptor

[davidyo]

Hi, I want to create an interceptor to retry EJB that are using container managed transactions. I am using Jboss 4.2.2, I have written a sample app to attempt to intercept the exceptions from the CMT, but am having problems in getting it working. Any help would be greatly appreciated, or an alternative approach?

Currently I am getting a Null Pointer Exception.

13:48:37,750 WARN [ServiceController] Problem starting service jboss.j2ee:ear=RetryTest.ear,jar=RetryTest-ejb.jar,name=SimpleSessionBean,service=EJB3
java.lang.NullPointerException
 at java.util.Arrays$ArrayList.<init>(Arrays.java:2355)
 at java.util.Arrays.asList(Arrays.java:2341)
 at org.jboss.ejb3.stateless.StatelessRemoteProxyFactory.getInterfaces(StatelessRemoteProxyFactory.java:76)
 at org.jboss.ejb3.stateless.BaseStatelessProxyFactory.init(BaseStatelessProxyFactory.java:163)
 at org.jboss.ejb3.stateless.StatelessRemoteProxyFactory.init(StatelessRemoteProxyFactory.java:113)
 at org.jboss.ejb3.stateless.BaseStatelessProxyFactory.start(BaseStatelessProxyFactory.java:212)
 at org.jboss.ejb3.stateless.StatelessRemoteProxyFactory.start(StatelessRemoteProxyFactory.java:120)
 at org.jboss.ejb3.ProxyDeployer.start(ProxyDeployer.java:83)

This is my jboss.xml file

<?xml version="1.0" encoding="UTF-8"?>
<jboss>

 <container-configuration extends="Standard Stateless SessionBean">
 <container-name>Retry</container-name>
 <container-interceptors>
 <interceptor>org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor</interceptor>
 <interceptor>org.jboss.ejb.plugins.LogInterceptor</interceptor>
 <interceptor>retrytest.RetryInterceptor</interceptor>
 <interceptor>org.jboss.ejb.plugins.SecurityInterceptor</interceptor>
 <!-- CMT -->
 <interceptor transaction="Container">org.jboss.ejb.plugins.TxInterceptorCMT</interceptor>
 </container-interceptors>
 </container-configuration>



<enterprise-beans>
 <session>
 <ejb-name>SimpleSessionBean</ejb-name>
 <jndi-name>RetryTest/SimpleSessionBean</jndi-name>
 <configuration-name>Retry</configuration-name>
 </session>
 </enterprise-beans>
</jboss>

This the Interceptor

public class RetryInterceptor extends AbstractInterceptor
 {
 private static Log log = LogFactory.getLog(RetryInterceptor.class);

 @Override
 public Object invokeHome(final Invocation mi) throws Exception
 {

 System.out.println("INVOKE HOME retry INTERCEPTOR");

 Object o = null;
 //will wrap up with a retry loop
 try{
 o = getNext().invokeHome(mi);
 }catch(Exception e){
 log.info("RetryInterceptor: retry got an exception "+e);
 e.printStackTrace();
 }

 return o;

 }

 @Override
 public Object invoke(final Invocation mi) throws Exception
 {
 System.out.println("INVOKE retry INTERCEPTOR");


 Object o = null;
 //will wrap up with a retry loop
 try{
 o = getNext().invoke(mi);
 }catch(Exception e){
 log.debug("RetryInterceptor: retry got an exception "+e);
 e.printStackTrace();
 }

 return o;
 }
}