Re: [aspectj-users] add aspect without source

[Jim Hugunin <lists@xxxxxxxxxxx>]

Here's a very short tutorial on how to use ajc to weave into existing 
.class files.
===============================================================
Step 1. Make hello.jar

File Hello.java
--------------------
public class Hello {
    public static void main(String[] args) {
        System.out.println("hello world");
    }
}
--------------------
> javac Hello.java
> jar -cf hello.jar Hello.class
> java -classpath hello.jar Hello
hello world
===============================================================
Step 2. Weave in a simple tracing aspect

File Trace.aj
--------------------
public aspect Trace {
    before(): execution(* Hello.*(..)) {
        System.out.println("entering: " + thisJoinPoint.toString());
    }
}
--------------------
> ajc Trace.aj -injars hello.jar -outjar trace-hello.jar
> java -classpath trace-hello.jar;<path-to-lib>\aspectjrt.jar Hello
entering: execution(void Hello.main(String[]))
hello world
=================================================================

Does this help?  If you're still have problems please try to provide as 
concrete and detailed an example as possible to help us understand what 
you're trying to do.

-Jim