Java web application consumes CPU on server

Java programs consume a lot of CPU and are easier to analyze. There are several steps:1. View threads with high 
through the top command (press shift+H after top to display threads) ;
2. Convert the thread number to hexadecimal;
3. Use jps to view the Java process number of the server;
4. Use jstack [process number] to print the current process stack;
5. From the printed information, find the thread number obtained in step 2 and see what this thread is doing.
You may not be able to grasp the thread status at one time. You can record several more threads in the first step.