After the Spring Boot service is running for a period of time, how to troubleshoot?

Troubleshooting SSH connection interruption after Spring Boot application runs for a period of time

I have encountered a difficult problem recently: After the Spring Boot service is running for a period of time, both the SSH connection and the telnet connection of the service port (such as 8082) fail. It can be temporarily solved after restarting the service, but the problem will occur repeatedly. This article will conduct in-depth analysis of possible causes and troubleshooting steps.

First, the telnet connection service port failure indicates that the service may have stopped running. Use the ps command to confirm whether the service process exists. If the process has disappeared, you need to check the service log for error messages that cause the service to crash, and pay special attention to OutOfMemoryError (OOM) errors, which usually leave clear records in the log.

Secondly, excessive memory usage is another key factor. JVM parameters (such as -Xmx , -Xms , -Xss ) control the memory allocation of Java services. There is an upper limit for the memory usage of a Java process. Exceeding the upper limit will cause the program to terminate due to insufficient memory. Use top or free command to monitor the system's available memory, the memory configured by the Java process, and the actual memory usage, and observe the memory changes. Further, use jmap command to analyze the detailed situation of Java heap memory, identify objects or code segments that occupy large memory, thereby positioning the problems of memory leakage or inefficient memory usage.

Finally, SSH connection failure (default port 22) is usually not related to Java application, it is a standalone system process. If the SSH connection fails and other applications are normal, the problem may be at the operating system or hardware level. For example, overheating of the server can cause hardware failure, or problems with the operating system itself, can cause SSH connection failure. Of course, there are extreme situations: Spring Boot applications have serious flaws, such as performing a large number of underlying operations or extremely unreasonable memory allocation, which may cause the operating system to crash and affect SSH connections.

Therefore, the strategy for troubleshooting such problems should start with the service process itself and check log and memory usage. If the service process is normal, the possibility of operating system or hardware failure needs to be considered. For Java developers, it is crucial to master JVM parameter configuration and memory analysis tools.

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