You're in a situation when you must produce a log when a method (or some methods) are invoked. How can you implement this? AnnoJ can help you.
If all methods in a class must be logged simply annotate that class with annotation @Loggable:

	@Loggable
	public class ClassToLog{
		//many important methods
	}

If the class is loaded by TransformingCassLoader then all method invocations (including provate methods) i the class will be logged. Logging uses the java.util.logging.Logger class and every invocation is logged on info level.
If you only have to log a few mwthods you have two choices. First, you can annotate the methods eith annotation @Loggable:

	public class ClassToLog{
		@Loggable
		public void importantMethod(){

		}

		//less important methods
	}

In this case only importantMethod will be logged. If the both the class and the method are annotated then the class level annotation wins: all method will be logged.
Your second choice is to list the method names to log in the @Loggable method parameter:

	@Loggable(methods={"importantMehtod"})
	public class ClassToLog{
		public void importantMehtod(){

		}
		//and the others
	}

If you want all methods of classes in a package be logged you have to define a class named PackageInfo in that package and annotate it with @Loggable:

	@Loggable
	public class PackageInfo{}