[jboss-user] [EJB3] - Why ApplicationException thrown from server-side interceptor is wrapped by JBoss AS/EJB container?

[xiang yingbing]

xiang yingbing [https://community.jboss.org/people/ybxiang.china] created the discussion

"Why ApplicationException thrown from server-side interceptor is wrapped by JBoss AS/EJB container?"

To view the discussion, visit: https://community.jboss.org/message/766555#766555

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Dear guys,


I defined an application exception and an Intercepter in server side:

import javax.ejb.ApplicationException;
@ApplicationException(rollback=true)
public class *NotExistingSessionTokenException* extends Exception {    
    private static final long serialVersionUID = 1L;

    public static final NotExistingSessionTokenException INSTANCE;
    static {
        INSTANCE = new NotExistingSessionTokenException();
    }

    private static final String MSG = "Fake Session Exception";

    private NotExistingSessionTokenException() {
        super(MSG);
    }
}



public class SessionTokenInterceptor {
    Logger log = Logger.getLogger(SessionTokenInterceptor.class);

    @PersistenceContext
    protected EntityManager em;

    @Resource
    private EJBContext ejbContext;

    @AroundInvoke
    public Object processSessionToken(final InvocationContext invocationContext) throws Exception{
        //1. session token
        //log.info("retrieve SESSION TOKEN from invocation context instead of ejbContext");
        String sessionToken = (String)invocationContext.getContextData().get(ServerClientSharedConstants.SESSION_TOKEN_KEY);
        //log.debug("SESSION_TOKEN:"+sessionToken);//good!

        //2. JAAS username
        //log.info("retrieve JAAS username");
        String username = ejbContext.getCallerPrincipal().getName();//JAAS username

        //3. check
        if(sessionToken==null){
            log.error("User["+username+"] has no SESSION TOKEN, so is NOT allowed to do more in this system.");
            throw NullSessionTokenException.INSTANCE;
        }
        if(! isSessionTokenExisting(sessionToken)){
            log.error("User["+username+"] is using invalid SESSION TOKEN, so is NOT allowed to do more in this system.");
            throw *NotExistingSessionTokenException.INSTANCE;*
        }

        //4. call original method and return its result so that other interceptor can continue
        try{
             return invocationContext.proceed();
        }finally{
        }
    }
}


I used the interceptor on my session bean:
@Interceptors({*SessionTokenInterceptor*.class})
public class SecuredRemoteSession implements ISecuredRemoteSession{
...
}





On client side, I catch this exception in an interceptor, but I got a wrapped Exception: javax.ejb.EJBException


import java.lang.reflect.UndeclaredThrowableException;

import org.apache.log4j.Logger;
import org.eclipse.swt.widgets.Display;
import org.jboss.ejb.client.EJBClientInterceptor;
import org.jboss.ejb.client.EJBClientInvocationContext;

import com.ybxiang.nms.common.exception.NotExistingSessionTokenException;

public class ClientExceptionInterceptor implements EJBClientInterceptor{
    private final static Logger log = Logger.getLogger(ClientExceptionInterceptor.class);

    @Override
    public void handleInvocation(EJBClientInvocationContext context)
            throws Exception {
        context.sendRequest();
    }

    @Override
    public Object handleInvocationResult(EJBClientInvocationContext context)
            throws Exception {
        String methodName = context.getInvokedMethod().getName();

        for(int i=0;i<ignoredMehtods_handleInvocationResult.length;i++){
            if(methodName.equals(ignoredMehtods_handleInvocationResult[i])){
                return context.getResult();
            }
        }

        Object result = null;
        try{
            result = context.getResult();
        }catch(*NotExistingSessionTokenException* e){
 *log.error("NotExistingSessionTokenException is NOT catched!");//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ What I want!*
*}catch(javax.ejb.EJBException e){       * 
            if(e.getCause() instanceof java.lang.reflect.UndeclaredThrowableException){
                UndeclaredThrowableException cause = (UndeclaredThrowableException)e.getCause();
                Throwable t = cause.getUndeclaredThrowable();

                if(t instanceof *NotExistingSessionTokenException*){
*log.error("NotExistingSessionTokenException is catched!");//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ What I NOT want!*
                }else{
                    log.error("bla bla...);
                }
            }
            else{
            }
            throw e;
        }catch(Exception e){
            log.error("UNknown Exceptoin：",e);

            throw e;
        }finally{
        }        

        return result;
    }
}




Why Application Exception thrown in server-side interceptor is wrapped by EJB container?

Thanks in advance.
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