How to detect thread being blocked by IO?

Question

In Java, thread can have different state:

NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, TERMINATED

However, when the thread is blocked by IO, its state is \"RU

Answer 1

You can check the statckTraces of the thread then find if the last stack is in some specific method associated with i/o blocking (eg: java.net.SocketInputStream.socketRead0)

This is not a clever way but it works.

JProfiler supports the feature you need, details show at: WHAT'S NEW IN JPROFILER 3.1