Solve the problem:
1. 使用 jps -l 定位进程号
Remember our process number
2. 使用 jstack 进程号 找到死锁问题
Turn to the end and see that Found 2 deadlock issued a deadlock.
Thread 1 locks 0x000000076b740578 and wants to acquire 0x000000076b740540 lock.
Thread 0 locks 0x000000076b740540 and wants to acquire 0x000000076b740578
lock. , leading to blocking here