I have an application written in Java that is crashing with JVM core dumps. All debug symbols have been installed but since the default build of JDK doesn't have Java binary with debug information, it is difficult to nail down the problem. gdb shows ?? for method calls. Are there any debug builds available for JDK 6u33 on Linux? From what I understand, the code base for OpenJDK 6 is different from Oracle's JDK releases so the chances of openjdk debug build having same symbol information are fairly low. Any help or direction is greatly appreciated.