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Thread: Basic Beginner Help

  1. #1
    Junior Member
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    Apr 2010
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    Default Basic Beginner Help


    In Windows, in a command prompt, is there a way to capture error messages generated when running a Java class file, using the syntax >java MyDemo.class?

    I've tried piping it into a text file using >java MyDemo.class > error.txt
    but this creates an empty error.txt file.

    Essentially I want to be able to paste the error into a forum post.


  2. #2
    Super Moderator helloworld922's Avatar
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    Jun 2009
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    Default Re: Basic Beginner Help

    The default error stream always points to be displayed out to the console. You can create a new stream to be written out to for the error stream, but you can't use the redirection method in conjunction with this method (unless they are to be redirected to the same file).

    // sets the error stream to redirect all error to a file called "errors.txt". Auto-flushing is enabled
    System.setErr(new PrintStream(new FileOutputStream("errors.txt"),true);
    System.err.println("Start of error logging in errors.txt");

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