How to kill a java thread using VisualVM or using a unix command?

Question

I m using windows 7 OS. I have around 6 threads in my application. For the purpose of testing the alerts to check the health of the threads, i need to kill the thre

Answer 1

As mentioned in a previous post by buzz3791, it works by using jdb. However the change that I noticed is, you can't kill the thread, but you can interrupt or suspend the thread.

#jdb -attach 50100

threads --This will show all threads running on the jvm under Groups and Reference Handler section.

Groups	Reference Handler
:(com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary)0x36c1:	OrientDB (/xxx.xxx.xxx.xxx:123) <- BinaryClient (/xxx.xxx.xxx.xxx:678)

thread 0x36c1-- This will be the thread id that can be picked from one of the threads in the thread that you wish to kill/interrupt and run this interrupt 0x36c1

OrientDB (/xxx.xxx.xxx.xxx:123) <- BinaryClient (/xxx.xxx.xxx.xxx:678)[1] interrupt 0x36c1

you can try multiple times the same interrupt command and if it is already interrupted, it will show that the thread id is invalid. Thus you know that the thread is killed, this can be verified by looking at the stack trace and confirmed.

Tested this on the OrientDB database server with jdk 8 and it works.