[aspectj-users] How to inject a static field into a multitude of types w

[mark Kharitonov <mark.kharitonov@xxxxxxxxx>]

I would like to add a log4j.Logger private static field into a multitude of types. For instance, into all the types annotated with the @Path annotation.

This my current aspect code:

    public aspect LoggingAspect {
      public interface HttpHandlerType {}
      declare parents: (@Path *) implements HttpHandlerType;
     
      public Logger HttpHandlerType.Log = Logger.getLogger(getClass());
     
      pointcut httpHandlerMethods(HttpHandlerType o) : within(HttpHandlerType+) &&
        execution(@(GET || PUT || POST || DELETE) public * *.*(..)) && this(o);
     
      before(HttpHandlerType o): httpHandlerMethods(o) {
        if (o.Log.isInfoEnabled()) {
          o.Log.info(logMethod(thisJoinPoint));
        }
      }
     
      after(HttpHandlerType o) returning (Object result): httpHandlerMethods(o) {
        if (o.Log.isDebugEnabled()) {
          o.Log.debug(logMethod(thisJoinPoint, result));
        }
      }
     
      after(HttpHandlerType o) throwing (Exception e): httpHandlerMethods(o) {
        if (o.Log.isEnabledFor(Level.ERROR)) {
          o.Log.error(logMethod(thisJoinPoint), e);
        } 
      }
   
      private static String logMethod(JoinPoint jp) {
        ...
      }
   
      private static String logMethod(JoinPoint jp, Object result) {
        ...
      }
    }

The problem is that the Log field is an instance field, while it should be a static one. But one cannot specify a static field inside an interface.

So my question is how to change the aspect implementation to make the Log a static field?

Thanks.

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