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I'm executing an external program which runs alongside Java using this:

Process p = Runtime.getRuntime().exec("/path/to/binary");

When I stop the Java application, the external program continues to run but I want this to stop too.

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To trigger the shutdown, you could add a shutdown hook to your Java application. See Runtime.addShutdownHook().

To effect the shutdown, you could either communicate to the external process a request to stop gracefully, or call Process.destroy()

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use shutdown hook : http://download.oracle.com/javase/1.4.2/docs/guide/lang/hook-design.html

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