"HSDB and CLHSDB are the GUI and command-line Serviceability Agent debuggers. You need to set environment variable SA_JAVA to the jdk/bin directory and the PATH should contain the JVM binary used by the target process. java -Dsun.jvm.hotspot.debugger.useXXXDebugger=true -classpath sa-jdi.jar sun.jvm.hotspot.HSDB where XXX is 'Windbg' on windows and 'Proc' on Unix"