getting the number of threads in a Java VM using Java code

Question

I am looking for a way to get the number of threads in a JAVA VM, using JAVA code. Any ideas?

Many thanks in advance

You can extrapolate it from this [Get a List of all Threads currently running in Java](http://stackoverflow.com/q/1323408/811865) — Jerome, Mar 01 '12 at 09:37

score 3 · Answer 1 · answered Mar 01 '12 at 09:37

3

Try this:

Thread.getAllStackTraces().size()

answered Mar 01 '12 at 09:37

jlemos

By doing that you retrieve the stacktrace of every running Thread. That could be annoyingly slow if you had hundreds of threads, see [Get a List of all Threads currently running in Java](http://stackoverflow.com/q/1323408/811865) – Jerome Mar 01 '12 at 09:41

score 3 · Answer 2 · answered Mar 01 '12 at 09:46

3

I think, you can also get it using JMX using ThreadMXBean management interface. Here is a sample.

answered Mar 01 '12 at 09:46

Nikunj

ThreadMSBean.getThreadCount() should be more efficient than getting all the stack traces. – Peter Lawrey Mar 01 '12 at 09:59

2 Answers2