Question

Goal: I have client-server program in which client and server runs in different jvms.
To test the same, I want to invoke the Server in a different JVM programatically and then use current jvm to run the client and execute different C/S tests.

Is there any way I can execute a method or run Java commands in different jvm programatically?

Answer 1

1) The most powerful tool in java to run process is ProcessBuilder:

ProcessBuilder pb = new ProcessBuilder("java", "-server", "-jar", "yourJar.jar");

Process p = pb.start();

Than using Process you are able to manipulate child process e.g. read InputStream, destroy e.t.c.

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2) If you are able to edit both source code review this question to build efficient communication between JVM on the same host.
If you cannot change code, simply create own loader which load Server and implements inter JVM communication and invoke methods you need, because it in the same JVM space.