Troubleshooting Java program server thread issues

Preface

When we run a Java SpringBoot program on the server, it is very important to understand the real-time thread operation of the program and perform troubleshooting. This helps us track issues, locate failures and fix them accordingly. This article will introduce how to view the real-time thread running status of the Java SpringBoot program on the server and the steps and tools for troubleshooting.

This article mainly uses the tool jstack.
jstack is a command line tool that comes with Java. It can generate thread dump information of Java programs and help us analyze faults that occur in the program. Here are the steps to troubleshoot using jstack:

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1. Find the process ID (PID) of the Java SpringBoot program:
   jps command to find the process ID, assuming that the process ID pid is 21711
   Note: Common methods for finding the process ID can also use ps aux | grep [process keyword], top, etc.

2. Use the top -Hp [pid] command to find the CPU consuming thread, assuming the thread ID tid is 21742

   top -Hp 21711
   

3. Use the printf "%x\n" [tid] command to convert the thread ID (21742) into hexadecimal format tid16 (54ee).

   printf "%x\n" 21742
   

4. jstack [pid] | grep [tid16]

   jstack 21711 | grep 54ee
   
   # 常结合上下文查看 -C查看该日志前后n行
   jstack 21711 | grep 54ee -C10
   

5. For other methods, use the command jstack [pid] > thread_dump.txt, which saves the thread dump information to a file named "thread_dump.txt". You can use a text editor to open the file and analyze the thread information in it.

in conclusion

It is very important to view and troubleshoot the real-time thread operation of the Java SpringBoot program on the server. Using tools such as jstack can help us analyze the thread status of the program and generate thread dump information. In addition, logging and using debugging information are also effective means of troubleshooting. By combining these tools and methods, we can more quickly locate problems, resolve failures, and improve program reliability and performance.

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