Annotate Java method for logging its result and exceptions

Question

Is it possible to log result,that method returned with annotation?
or specific Exceptions,that was thrown by method?

Can't find return value for method m or something like that ,using this call:

for (Method m : Class.forName("AnnotatedBean").getMethods()) {
  ...
}

AnnotatedBean is class,which methods annotated by custom annotation.

Miserable Variable · Accepted Answer · 2011-10-11 16:26:58Z

3

Is it possible to log result,that method returned with annotation? or specific Exceptions,that was thrown by method?

This seems textbook example of separation of concerns. Take a look at AspectJ; production aspects can work very well in this situation.

Can't find return value for method m or something like that ,using this call:

Now I am confused. How can return value "not be found"?

answered Oct 11, 2011 at 16:26

Miserable Variable

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5 Comments

sergionni Over a year ago

"return value" - here I mean to log the result of the method

sergionni Over a year ago

should I use AspectJ mandatory instead of standard ways? what is good practice now?

Miserable Variable Over a year ago

I don't know what is "mandatory instead of standard ways". I believe production aspects are idiomatic for separation of concerns. My point is basically...whatever works, is easy to implement and least error prone.

sergionni Over a year ago

i mentioned,what is best practice for now

Miserable Variable Over a year ago

sorry..there is some communication gap :) I understand that you are asking what is currently considered best practice, but I am unable to understand what you mean by "using AspectJ mandatory" and by "using AspectJ in standard ways". If by mandatory you mean that it is wired into the application (as against being optionlal) then yes, I believe hard-wiring aspects is quite the norm, and known as production aspects

matt b · Accepted Answer · 2011-10-11 16:31:34Z

1

Can't find return value for method m or something like that ,using this call:

You need to invoke the method to get a return value back.

for (Method m : Class.forName("AnnotatedBean").getMethods()) {
    Object returnValue = m.invoke(instance, args);
}

answered Oct 11, 2011 at 16:31

matt b

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2 Comments

sergionni Over a year ago

matt,can the invoke() method slowdown my application? that i'm afraid of.I mean,is method ran twice in runtime in this case?

matt b Over a year ago

I'm not sure what you mean. Method.invoke() calls the actual method, which seems necessary if you want to log it's result in some sort of aspect such as this.

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