JavaDumper
Simple to dump Java class to file
Useage:
Java {all your javaagent, agentlib, agentpath} -javaagent:JavaDumper.jar=<class to dump>;<where to save> {other}
E.g.:
java -javaagent:JavaDumper.jar=java.lang.Shutdown;Shutdown.class -jar JavaDumper.jar