I had fun with another decompiler, JAD, years and years ago. There was a bug in a closed source LDAP server we were using and I was able to use JAD to narrow down the bug location and examine the classes.<p>Looks like this doesn't support modern javas:<p>> JD-Core works with most current compilers including the following: JDK 1.1.8, JDK 1.3.1, JDK 1.4.2, JDK 1.5.0, JDK 1.6.0, JDK 1.7.0, JDK 1.8.0, JDK 9.0.1, JDK 10.0.2