Question

Environment: Java EE 6

How to determine in Interceptor if the invoked bean is container managed (CMT) or bean managed (BMT)?

Answer 1

Beans are by definition always container managed.

Likely you want to know is current transaction CMT or BMT. Because @AroundInvoke interceptor method is executed in same transaction as intercepted business method, you can check transaction type with following:

public class SomeInterceptor {
    @Resource
    private javax.ejb.SessionContext sessionContext;

    @AroundInvoke
    public Object intercept(InvocationContext ctx) throws Exception {
        if (isCMT()) {

        }
        ...
    }

    private boolean isCMT() {
        try {
           //throws IllegalStateException if not BMT
           sessionContext.getUserTransaction();
           return false;
        }
        catch (IllegalStateException ise) {
           return true;
        }
    }
}

Of course using exceptions to control flow is bad, but I am not aware of alternative method to differentiate between BMT and CMT.