arthas/arthas-tutorials-en/arthas-basics/thread.md

The thread 1{{execute interrupt}} command prints the stack of thread ID 1 - thread command Docs.

Arthas supports pipes, and you can find main class{{}} with thread 1 | grep 'main('{{execute T2}}.

You can see that main class{{}} is demo.MathGame{{}} :

$ thread 1 | grep 'main('
    at demo.MathGame.main(MathGame.java:17)