JBoss Byteman demo http://stackoverflow.com/questions/12187369

Foo.java

public class Foo {

    public void test1() {
        long timeout = System.currentTimeMillis() + 500;
        int i = 0;
        while (System.currentTimeMillis() < timeout) {
            System.out.println(i++);
            try {Thread.sleep(50);} catch (Exception ex) {}
        }
    }


    public static void main(final String ... args) throws Exception {
        new Foo().test1();
    }

}

sleeper.btm

RULE counter
CLASS Foo
METHOD test1
AT ENTRY
IF TRUE
DO createCountDown($0, 5)
ENDRULE

RULE sleeper
CLASS Foo
METHOD test1
AT INVOKE Thread.sleep()
IF countDown($0)
DO RETURN
ENDRULE

x_runs.txt

$ ~/Downloads/byteman-download-2.1.0/bin/bmjava.sh -l ./sleeper.btm Foo
0
1
2
3
4
5

$ java Foo 
0
1
2
3
4
5
6
7
8
9