Jstack and thread dump instance parsing

Jstack definition:

Jstack is a stack tracing tool that comes with the Java virtual machine.

Jstack is used to generate a thread snapshot of the Java virtual machine at the current time. Thread snapshot is a collection of method stacks being executed by each thread in the current Java virtual machine. The main purpose of generating thread snapshot is to locate the causes of long-time pause of threads, such as deadlock between threads, dead loop, long wait caused by requesting external resources, etc.

A deadlock code is run here, causing two threads in the program to wait for each other to release the lock, causing the program deadlock.