How to locate Java Process CPU utilization in Linux under the high reason __CPU

First view the CPU-intensive process PID through the top command, and then press 1 after top to see each core occupancy ratio

Top

Here because I am using the virtual machine, even if my Java process occupies a high CPU is only a virtual machine, and the entire machine's CPU is not high. We found pid=7957 here.
And then we're figuring out the CPU-hogging threads based on the PID.

Top-h-P 7957

Then use the Strace-p command to view the invocation based on the thread id=7958

Found the system is constantly printing 1
Then convert the thread decimal thread id=7958 to hexadecimal

Finally grab stack information and see where the code is


I saw the thread 7958, and I got to the fourth line of Test.main, and we opened the code to see