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;
| }
| }
|
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