In which order are Interceptors excecuted?

Question

I am reading some tutorials regarding Interceptors in java ee, but there are some themes which are not covered extensively. Therefore I would be greatful to anyone having answers to the following questions:

1) In which order are Interceptors execueted in case the target class contains an @AroundInvoke method as:

@Interceptors({PrimaryInterceptor.class, SecondaryInterceptor.class})
@Stateful
public class OrderBean {
...
    @AroundInvoke
    private void last(InvocationContext ctx) { ... }
...
}

I have the impression that first it is excecuted the taget class Interceptor, namely the last method in the above case and then the two class-level Interceptors in the order specified inside the annotation. Am I right?

2) What are Timeout Interceptors (containing methods with the annotation @AroundTimeout) and when are the excecuted?

Answer 1

Quoting the documentation.

By default the ordering of interceptors when invoking a method are

• External interceptors

• Default interceptors, if present

• Class interceptors, if present

• Method interceptors, if present

• Interceptor method on the bean class (using @AroundInvoke)

Within each group (default, class, method) the order of the interceptors are from left to right as defined in the @Interceptors annotation, and then the XML interceptors.

And for the second question - @AroundTimeout is used together with EJB timers, interceptor is fired whenever method annotated with @Schedule timeouts - see this example.