passing value to custom annotation in java

Question

I am using custom annotation with aspectj.

@TestLoggingAnnotation(setMessage = "I want to set value here")
public void get() {

    String retString = null;
    String message = "DEFAULT";

    if (message == "DEFAULT") {

        retString = "Default Logging";

    } else {

        retString = "Custom Logging";
    }
}

The above is just simple and sample code. My requirement is that I want to pass the parameter value after resulting from method.

In my case I want set retString value to setMessage in custom parameter.

afaik, custom annotation methods cannot have parameters. But I'd love to be wrong. — CPerkins, Oct 10 '13 at 12:21
@CPerkins `@TestLoggingAnnotation(setMessage = "I want to set value here")` you can call an thing to `setMessage = "I want to set value here".` I want to set value of setMessage. now it is ok ? — Shahid Ghafoor, Oct 10 '13 at 12:25
there is another reply on stackoverflow for this issue http://stackoverflow.com/questions/14268981/modify-a-class-definitions-annotation-string-parameter-at-runtime — RamonBoza, Oct 10 '13 at 12:34
I'm writing it as a comment in case I'm wrong - but annotation are not exactly a part of your run-time code. As their name states, they only annotate. They come to mark something that was set in compile time on a class or field. You can't use variables in annotations because the data is decided on in compile time. — Avi, Oct 10 '13 at 12:34

score 2 · Answer 1 · edited May 23 '17 at 12:22

2

As of now, annotations can only take compile constants and cant be assigned values at runtime, though their value can be used at runtime using @Retention.

discussion follows here

edited May 23 '17 at 12:22

Community

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answered Oct 10 '13 at 12:44

codingenious

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score 0 · Answer 2 · answered Oct 10 '13 at 12:53

0

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface TestLoggingAnnotation{
    String setMessage ();
}

now use reflection to extract and set method param i doubt we can do this with local varibles.

answered Oct 10 '13 at 12:53

Pankaj Sharma

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passing value to custom annotation in java

2 Answers2