Java reading standard output from an external program using inputstream

Question

I am trying to develop a class that reads the standard output of an external program(using an instance of Process, Runtime.getRuntime().exec(cmdLine, env, dir)). The program

Answer 1

You have to consume both the program's stdout and stderr concurrently to avoid blocking scenarios.

See this article for more info, and in particular note the StreamGobbler mechanism that captures stdout/err in separate threads. This is essential to prevent blocking and is the source of numerous errors if you don't do it properly!