this problem is actually quite simple. If you type a Command in the terminal and you are prompted to say that the Command is not found, either because you have not installed the appropriate package or because of a path setting problem. If it’s because of a software package, there’s nothing more to say, just install the appropriate software package. In the other case, the user’s path needs to be set.

JPS this command is located under the bin file in the Java installation directory, and you need to check whether the JAVA_HOME and PATH in the etc/profile are added correctly.