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I’d like to start external third party application from my Java application. This external application should run all the time whilst my java application runs.
From time to time (it depends on user interaction) my java app should be able to read and write to this external application via stdin and stdout.
How can I do that?
Is ex-app native code, or another Java program? If it’s native code, look at http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Process.html and http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Runtime.html
Those will allow you to execute a native program, keep track of its status, and get its output and send it input.