Interceptors invocation sequence?

[Alejandro Dominguez]

Hi ranchers,
I was trying out some features of the EJB Interceptors and came to a strange behavior:

Statefull session bean defines class interceptor.
Upon calling a method, first is fired the class interceptor, and then the method itself (this is normal).
Console output:

  
ClassInterceptor: before doSomethingWoMethodInterceptor
doSomethingWoMethodInterceptor
ClassInterceptor: after doSomethingWoMethodInterceptor

Once I added @PostConstruct to the session bean and to the ClassInterceptor I got the following (normal) behavior:

  
ClassInterceptor: PostConstruct before
PostConstruct()
ClassInterceptor: PostConstruct after
ClassInterceptor: before doSomethingWoMethodInterceptor
doSomethingWoMethodInterceptor
ClassInterceptor: after doSomethingWoMethodInterceptor

Now for the weird part: I add a @PostConstruct method in the MethodInterceptor, which is assigned to a *totally* different method from the one being called in the session bean, and I get the following (non-normal?) behavior:

    
ClassInterceptor: PostConstruct before
MethodInterceptor: PostConstruct before      <-- WHY?
PostConstruct()
MethodInterceptor: PostConstruct after
ClassInterceptor: PostConstruct after
ClassInterceptor: before doSomethingWoMethodInterceptor
doSomethingWoMethodInterceptor
ClassInterceptor: after doSomethingWoMethodInterceptor

No interceptors are defined in ejb-jar.xml

My Bean code:

    
@Stateful
@Interceptors(ClassInterceptor.class)
public class InterceptorBean implements InterceptorRemote {
 
@Interceptors(MethodInterceptor.class)
public void doSomething() {
System.out.println("doSomething()");
}

public void doSomethingWoMethodInterceptor() {
System.out.println("doSomethingWoMethodInterceptor");

}

@PostConstruct
public void initialized() {
System.out.println("PostConstruct()");
}
}

ClassInterceptor (MethodInterceptor is identical, just a different .java)

    
public class ClassInterceptor {

private String name;

public ClassInterceptor() {
String[] names = this.getClass().getCanonicalName().split("\\.");
name = names[names.length - 1];
}

@AroundInvoke
protected Object intercepting(InvocationContext ctx) throws Exception {
try {
System.out.println(name + ": before " + ctx.getMethod().getName());
return ctx.proceed();
} finally {
System.out.println(name + ": after " + ctx.getMethod().getName());
}
}

@PostConstruct
public void initialized(InvocationContext ctx) throws Exception {
try {
System.out.println(name + ": PostConstruct before ");
ctx.proceed();
} finally {
System.out.println(name + ": PostConstruct after ");
}
}
 
}

The client:

    
Locator locator = new Locator();
InterceptorRemote remote = locator.locate(InterceptorRemote.class, "ejbTest/InterceptorBean");
remote.doSomethingWoMethodInterceptor();

My question is: why is @PostConstruct on the MethodInterceptor called? It's associated with a method that is not even called at all (demostrated by it's @AroundInvoke method non being called).

Any ideas?

Regards

Alejandro

Edited: forgot to add: using JBoss 4.0.5
[ June 06, 2007: Message edited by: Alejandro Dominguez ]

[Mark Spritzler]

It kind of reminds me of the joke.

Man goes into the doctor's office and raises his hand and arm above his head and says "Doctor it hurts when I do this". Doctor says, "Then don't do that"



Mark