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POJava tool/method to force-kill a child process
 

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  1. POJava tool/method to force-kill a child process
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    <p>I am looking for a Java tool/package/library that will allow me to force-kill a child process.</p> <p>This tool/package/library must work on Windows platform (mandatory). Support for Linux/Unix is desired.</p> <h2>My Problem</h2> <p>My Java code creates a child process that will simply not react to the standard Java way for killing a child process: process.destroy(), and, since I do not have the child's source code, I cannot program it to better handle termination requests.</p> <p>I have tried closing the child process' error input and output stream before calling destroy(), and for no effect.</p> <p>I have even tried passing ctrlBreak signal (char=3) directly into child.getOutputStream(), and again have received the same results.</p> <p>The workaround I have finally managed to find was to:</p> <ol> <li><p>Obtain the child's PID upon its creation This can be done in Windows by diffing the process lists before and after the child's creation (<code>getRuntime().exec("tasklist /v")</code>)</p></li> <li><p>Use the child's PID to issue a force kill system command<br> in Windows: <code>getRuntime().exec("taskkill /pid " + childPid + " /f")</code></p></li> </ol> <p>But - this is complex code I have no desire to debug and maintain, plus the problem itself, I have no doubt, was previously encountered by many other java developers, which leads me to the hope that such a Java tool/package/library already exists.</p> <p>I just don't know its name...</p> <p>PS: My child process was created by <code>Runtime.getRuntime().exec(cmd)</code>, but I get the same behaviour using a ProcessBuilder.</p>
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    1. CO@user605111: if you want to *force* it, then what you're doing isn't bad. Java's *getRuntime().exec* is **guaranteed** to let you call native processes. On Un*xes a *kill -9* **guarantees** the instant death and releases of all the process's resources (or the Un*x is broken). I don't know about Windows' *taskkill* guarantees but executing *taskkill* on Windows and *kill -9* on all Un*xes (including OS X) ain't exactly a long piece of code to write nor to maintain.
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    2. CO@user605111: btw, **never ever** pass a String containing whitespaces to *getRuntime().exec*. Split on spaces yourselft and invoke the *getRuntime().exec(String[] array)* method (the one that accepts a String array). Otherwise you'll have a lot of unbelievable headaches on various Windows/Un*x/JVM versions. Make your call: *getRuntime().exec(("taskkill /pid " + childPid + " /f").split("[ ]++"))* and life is going to get better :)
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