Dead Lock Thread Check

Question

Can somebody tell me how I can find out "how many threads are in deadlock condition" in a Java multi-threading application? What is the way to find out the list of deadlocked threads?

I heard about Thread Dump and Stack Traces, but I don't know how to implement it.

• I also want to know what new features have been introduced in Java 5 for Threading?

Please let me know with your comments and suggestions.

Answer 1

Way of obtaining thread dumps:

• ctrl-break (Windows) or ctrl-\, possibly ctrl-4 and kill -3 on Linux/UNIX
• jstack and your process id (use jps)
• jconsole or visualvm
• just about any debugger

Major new threading features in J2SE 5.0 (released 2004, in End Of Service Life Period):

• java.util.concurrent
• New Java Memory Model.