Redirecting stdout and stderr to GUI

Hello,
Is it possible to redirect System.out and System.err output to a JTextArea or a JLabel? This output will be coming from another class that is instantiated from within my GUI class.
Any suggestions or otherwise would be appreciated,
Thanks.

you need to define a PrintStream for it.
suggest you write a class extending OutputStream and in the flush() method include the writing to the text area.
MyOutStream outStream = new MyOutStream();
PrintStream ps = new PrintStream(outStream.getOutStream(), true);
System.setErr(myPrintStream);
System.setOut(myPrintStream);
can get messy mind you.
hope this points you in some useful direction.
Takis

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Redirecting stdout and stderr when starting a MS with the NM

We are looking at using the Node Manager for stopping and starting the managed servers in some of our projects, to give the testers/developers the ability with operator role in the WLS console to save them calling someone.
The only trouble is, with our existing shell start scripts we redirect shell level stdout and stderr to a file, i.e
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Any direction would be great.
Alistair.

Gene
Thanks for the replies and additional information.
I was almost sure that one of the previously suggested troubleshooting steps would solve the problem but unfortunately that was not the case.
So, let us look at the following factors....
1. Delete the Adobe Premiere Elements Prefs file and, if that does not work, then delete the whole 12.0 Folder in which the Adobe Premiere Elements Prefs file exists.
Local Disk C
Users
Owner
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2. Try to open the Premiere Elements 12 Editor from its Adobe Premiere Elements.exe file rather than desktop icon which uses Adobe Premiere Elements 12.exe file.
Local Disk C
Program Files
Adobe Premiere Elements 12
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Also, look at the necessity to right click the desktop icon for the program and the .exe files and apply Run As Administrator to each even if you are running the program from a User Account with Administrative Privileges.
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Please review. We will be watching for the results.
Thank you.
ATR

Where do my stdout and stderr go?

I've installed the iPlanet Webserver 6.0SP1 for Solaris.
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Marco.

You have to redirect the stdout and stderr when you start the server. So if you normally type
start
instead you should type
start > iPlanet.out
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Stdout and stderr log files

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Capturing Stdout and Stderr of Process before it finishes

Dear all,
I have to run a very long external task from java. This external program prints several messages while running. I am able to get these messages (and print them) with process.getInputStream. The problem is that I can only print those messages after the external program ends. Please, could anyone guide me on how to print those messages at the time they are printed by the external program?
Thank you very much,
Federico
PS: I am implementing all these using the SwingWorker class. It works properly except for the above mentioned problem.

I have modified my code according to the example shown below and now it works properly.
The problem was that I was using:
StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "MrBayesErr", System.err);StreamGobbler class is like the one in: http://www.velocityreviews.com/forums/t144656-runtimeexec-redirection-help-needed-mysql.html
I do not understand why that did not work. However, with the modifications shown below now it works.
Thank you,
Federico
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class MainClass {
public static void main(String[] args) throws Exception{
    Runtime r = Runtime.getRuntime();
    String[] nargs = { "sh", "-c", "for i in 1 2 3; do echo $i; done" };
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Redirecting stdout of third party API?

Good Morning (or afternoon),
I have an interesting problem with an application that I am writing.
I am using my own classes, as well as a third party package that somebody developed, in this application.
I have developed a GUI for ease of use and in this GUI I have a textarea component that shows all stdout messages.
To achieve this I simply used System.setOut(PrintStream out) to redirect the output to my textarea. Now, all stdout messages display on my textarea. So far so good.
The problem came when I used the third party package. The third party stdout still goes to the default (terminal).
I have to use the third party package through it's main method so I am calling ThirdPartyPackage.main(thingToPass).
Does anyone know why this occurs, or how I can get the third party classes to use the stdout that is currently in use by the calling class?
I am very stuck and would really appreciate any help even theoretical.
Thankyou in advance.

I am doing exactly the same thing, here's the code that calls an external process and appends the output to a JTextArea:
(txtOutput is the JTextArea I'm showing the output in)
          try
               Process proc = Runtime.getRuntime().exec(progName);
               InputStream procStdout = proc.getInputStream();
               InputStream procStderr = proc.getErrorStream();
               int exit = 0;
               boolean processEnded = false;
               while(!processEnded)
                    try
                         exit = proc.exitValue();
                         processEnded = true;
                    catch(IllegalThreadStateException e) {} // still running
                    int n = procStdout.available();
                    if(n > 0)
                         byte[] pbytes = new byte[n];
                         procStdout.read(pbytes);
                         //System.out.print(new String(pbytes));
                         //System.out.flush();
                         txtOutput.append(new String(pbytes));
                         txtOutput.setCaretPosition(txtOutput.getText().length());
                    n = procStderr.available();
                    if(n > 0)
                         byte[] pbytes = new byte[n];
                         procStderr.read(pbytes);
                         System.err.print(new String(pbytes));
                         System.err.flush();
                    try
                    Thread.sleep(10);
                    catch(InterruptedException e) {}
               System.out.println();
               System.out.println("Process exited with: " + exit);
          catch (java.io.IOException e)
               System.out.println(e.toString());
          }

Redirecting stdOut to a JTextArea - Help!

I want to redirect stdOut via System.setOut to a JTextArea - I'm most of the way there but I keep getting some strange errors. I'd really appreciate some help!
I have a class called MainDebug which in its constructor calls
System.setOut(new DebugStream((OutputStream)System.out));
it also has a method
public void appendMessage(String message)
txtAreaDebug.append(message);
where txtAreaDebug is the JTextArea to which I want to redirect stdOut.
In MainDebug is another class called DebugStream (which is referred to in MainDebug's constructor). The entirety of that class is as follows:
public class DebugStream extends java.io.PrintStream
public void println(String x)
MainDebug.this.appendMessage(x);
public void write(int x)
MainDebug.this.appendMessage(new Integer(x).toString());
When I build I get these errors:
pcgen\gui\MainDebug.java:63: cannot resolve symbol
symbol : constructor DebugStream (java.io.OutputStream)
location: class pcgen.gui.MainDebug.DebugStream
System.setOut(new DebugStream((OutputStream)System.out));
^
pcgen\gui\MainDebug.java:166: cannot resolve symbol
symbol : constructor PrintStream ()
location: class java.io.PrintStream
public class DebugStream extends java.io.PrintStream
For the first error, shouldn't DebugStream inherit the proper constructor from PrintStream? And I have no clue about the second error - I believe I've extended the class correctly.
Pearls of wisdom appreciated! :)

Constructors aren't inherited from superclasses, so you'll need to supply your own constructor for DebugStream.
FWIW, I've done this before and here's my version of DebugStream:
   private class MyPrintStream extends PrintStream
      public MyPrintStream(OutputStream pOut)
         super(pOut);
      public void println(String pString) {
         if (mResultsPanel != null)
            mResultsPanel.append(pString);
         super.println(pString);
      public void println(Object pObject)
         if (mResultsPanel != null)
            mResultsPanel.append(pObject.toString());
         super.println(pObject);
   }where mResultsPanel has a reference to the JTextArea.
Good luck,
Tom

How do you monitor a background thread and update the GUI

Hello,
I have a thread which makes its output available on PipedInputStreams. I should like to have other threads monitor the input streams and update a JTextArea embedded in a JScrollPane using the append() method.
According to the Swing tutorial, the JTextArea must be updated on the Event Dispatch Thread. When I use SwingUtilities.invokeLater () to run my monitor threads, the component is not redrawn until the thread exits, so you don't see the progression. If I add a paint () method, the output is choppy and the scrollbar doesn't appear until the thread exits.
Ironically, if I create and start new threads instead of using invokeLater(), I get the desired result.
What is the correct architecture to accomplish my goal without violating Swing rules?
Thanks,
Brad
Code follows:
import java.lang.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
public class SystemCommand implements Runnable
     private String[] command;
     private PipedOutputStream pipeout;
     private PipedOutputStream pipeerr;
     public SystemCommand ( String[] cmd )
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          pipeerr = null;
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          exec ();
     public void exec ()
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                                   pout.write ( inputChar );
                         if ( pout != null )
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                              pout.close ();
                         else
                              System.out.flush();
                    catch ( Exception e ) { e.printStackTrace (); }
          try
               Runtime r = Runtime.getRuntime ();
               Process p = r.exec ( command );
               OutputMonitor out = new OutputMonitor ( p.getInputStream (), pipeout );
               OutputMonitor err = new OutputMonitor ( p.getErrorStream (), pipeerr );
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               Thread t2 = new Thread ( err );
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               //p.waitFor ();
          catch ( Exception e ) { e.printStackTrace (); }
     public PipedInputStream getInputStream () throws IOException
          pipeout = new PipedOutputStream ();
          return new PipedInputStream ( pipeout );
     public PipedInputStream getErrorStream () throws IOException
          pipeerr = new PipedOutputStream ();
          return new PipedInputStream ( pipeerr );
     public void execInThread ()
          Thread t = new Thread ( this );
          t.start ();
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          JPanel p = new JPanel ( new BorderLayout () );
          JPanel bottom = new JPanel ( new FlowLayout () );
          JButton button = new JButton ( "Exit" );
          button.addActionListener ( new ActionListener ( )
                                   public void actionPerformed ( ActionEvent e )
                                        System.exit ( 0 );
          bottom.add ( button );
          p.add ( new JScrollPane ( ta ), BorderLayout.CENTER );
          p.add ( bottom, BorderLayout.SOUTH );
          p.setPreferredSize ( new Dimension ( 640,480 ) );
          return p;
     public static void main ( String[] argv )
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          class GuiUpdate implements Runnable
               private PipedInputStream pin;
               private PipedInputStream perr;
               private JTextArea outputArea;
               GuiUpdate ( JTextArea textArea, PipedInputStream in )
                    pin = in;
                    outputArea = textArea;
               public void run ()
                    try
                         // --- Reads whole file before displaying...takes too long
                         //outputArea.read ( new InputStreamReader ( pin ), null );
                         BufferedReader r = new BufferedReader ( new InputStreamReader ( pin ) );
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                         for ( ;; )
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                              if ( line == null ) { break; }
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                              // outputArea.paint ( outputArea.getGraphics());
                    catch ( Exception e ) { e.printStackTrace (); }
          // --- Create and realize the GUI
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          f.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE );
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          f.getContentPane().add ( getContentPane ( textOutput ) );
          f.pack();
          f.show ();
          // --- Start the command and capture the output in the scrollable text area
          try
               // --- Create the command and setup the pipes
               SystemCommand s = new SystemCommand ( argv );
               PipedInputStream stdout_pipe = s.getInputStream ();
               PipedInputStream stderr_pipe = s.getErrorStream ();
               // --- Launch
               s.execInThread ( );
               //s.exec ();
               // --- Watch the results
               SwingUtilities.invokeLater ( new GuiUpdate ( textOutput, stdout_pipe ) );
               SwingUtilities.invokeLater ( new GuiUpdate ( textOutput, stderr_pipe ) );
               //Thread t1 = new Thread ( new GuiUpdate ( textOutput, stdout_pipe ) );
               //Thread t2 = new Thread ( new GuiUpdate ( textOutput, stderr_pipe ) );
               //t1.start ();
               //t2.start ();
          catch ( Exception e ) { e.printStackTrace (); }


Thanks for pointing out the SwingWorker class. I didn't use it directly, but the documentation gave me some ideas that helped.
Instead of using invokeLater on the long-running pipe-reader object, I run it on a normal thread and let it consume the output from the background thread that is running the system command. Inside the reader thread I create a tiny Runnable object for each line that is read from the pipe, and queue that object with invokeLater (), then yield() the reader thread.
Seems like a lot of runnable objects, but it works ok.

Redirecting stdout in 64 bit mode

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I have a problem. I wanted to redirect stdout to a text file and back. In 32 bit mode everything works fine using file member to struct FILE, but in 64 bit mode only data member FILE has long _pad[16]. Can anyone tell me how to use this to redirect stdout to file and visevesra. Thanks in advance.
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Whats the best way to rotate stdout.log & stderr.log.
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<appender-ref ref="error" />
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Thanks,
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Redirecting stdout and stderr to GUI

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