How to get the invoker name in EJB interceptor'

问题:

I use Java EE 5. I wrote an interceptor for all EJBs with three methods for logging:

public class DefaultInterceptor {
    public static final String PREFIX = "!!!!!!!!!Interceptor:";

    @PostConstruct
    public void postConstruct(InvocationContext ctx) {
        try {
            System.out.println(PREFIX + " postConstruct");
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    @PreDestroy
    public void preDestroy(InvocationContext ctx) {
        try {
            System.out.println(PREFIX + " predestroy");
            System.out.println(PREFIX + "ctx.preceed=" + ctx.proceed());
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    @AroundInvoke
    public Object intercept(InvocationContext ctx) throws Exception {
        System.out.println(PREFIX + "method invocation '" + ctx.getMethod().getName() + "'");
        System.out.println(PREFIX + "parameters ='" + Arrays.deepToString(ctx.getParameters()) + "'");
        System.out.println(Arrays.deepToString(ctx.getContextData().keySet().toArray()));
        Object result = null;
        try {
            result = ctx.proceed();
            System.out.println(PREFIX + "Method result='" + result + "'");
            return result;
        } catch (Exception ex) {
            System.out.println(PREFIX + "Method exception ='" + ex.getMessage() + "'");
            throw ex;
        } finally {
            System.out.println(PREFIX + "Method finished");
        }
    }
} 

I want to get the name of EJB which called this interceptor. How can I do it?

I tried ctx.getMethod().getDeclaringClass().getSimpleName() but ctx.getMethod() returns null in postConstruct(-) and predestroy(-) methods.

回答1:

For lifecycle callbacks ctx.getMethod() returns null. This is documented for example here: http://docs.oracle.com/javaee/5/api/javax/interceptor/InvocationContext.html

That is so, because it is not your EJB, but container who calls lifecycle callback methods.

If you are interested about association between interceptor and bean it belongs to, doesn't ctx.getTarget() method serve your purpose?

回答2:

On WebLogic server you can use this in postConstructor, etc, to get the EJB name:

ctx.getTarget().getClass().getSuperclass().getName();