debugging Java synchronization

Question

Is there any mechanism within the Eclipse debugging environment to see the state of synchronization locks held and processes waiting?

Answer 1

You can show the state of object monitors in Eclipse's debugger. You can find a short, clear tutorial here. For each thread, Eclipse can show you the monitors the thread owns and those it is waiting for.

Answer 2

As suggested here you could (if you run the Sun JVM) perform the following steps:

1. launch jconsole or jvisualvm (both present in the bin-directory of your JDK-installation,
2. attach to the process you suspect has locked up
3. go to the Threads pane. There is a "Detect Deadlock" button