Steps To Fix Java Runtime.exec Hangs Linux

Over the past few days, some of our users have encountered a known error message with java runtime.exec hanging on linux. This problem occurs due to many factors. Let’s look at them now.

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    The runtime provides a static getRuntime() method that retrieves the current Java runtime. This is the only way to get a reference to make it an executable. This allows you to run external programs by calling the exec() template of the runtime class.

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    Why does my exec command hang when I run a program?

    It may happen that the output stream is currently filling up the operating system’s main buffer, your exec command may be automatically paused to give your disk a chance to age the buffer. But the program will still wait for the results to be processed. Hence the holding.

    I think the problem is that you are only reading my article InputStream, not ErrorStream. In addition, it is necessary to ensure parallel reading of two streams. So it may happen that the data itself coming out of your output stream is filling up the OS buffer, your particular exec command is automatically paused to give your end reader a chance.Option to clear the screen. But the program will also wait for the output to be able to process it. Hence the freeze.

    java runtime.exec hangs linux

    You can create a separate class to handle input streams and errors like this:

    How does Java exec work?

    Executive Executes the specified string command in a separate process with the specified environment. It’s a convenience formula. The call to exec(command, envp) behaves the same as callingin professional (command, envp, null).

    The public class ReadStream implements Runnable    Channel name;    There is an input stream;    yarn yarn;    public ReadStream(string name, InputStream is) = name; = is;                empty start()        string = new thread (this one);        stream.start();               public vacuum handle()        To attempt            InputStreamReader isr = new InputStreamReader(is);            BufferedReader br means new BufferedReader (isr);            even if (true)                Line s = br.readLine();                if (s == null) pause;                System.out.println("[" + + name "] " + s);                        close ();        Catch (exception ex.)            System.out.println("Problem reading stream ".+ Alias ​​+ "...:" Example); + e.g. printStackTrace();            

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  • String cmd= "cmd /C if viewhistory --project="+fileName; --fields=reworkProcess p = Runtime.getRuntime().exec(cmd)s1 = ReadStream("stdin", new value p.getInputStream());s2 new ReadStream("stderr", p.getErrorStream());s1.start();s2.start();p.wait();} catch E) (Exceptione.printStacktrace(); be    if(p !means zero)        n. destroy();

    Is runtime exec blocking?

    exec() does not block an already existing thread, and your code does exactly the same as the computer code in the question.

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