JCarder is an open source tool for finding potential deadlocks in concurrent multi-threaded Java programs. It does this by instrumenting Java byte code dynamically (i.e., it is not a tool for static code analysis) and looking for cycles in the graph of acquired locks.

The only requirement is that the program you want to analyze can be run in an ordinary JVM (compliant with Java 5.0 or higher). There is no need to use a special JVM or build procedure.