[SOLVED] Java heap space OutOfMemoryError

[loki]

Hi all

I'm pretty new to java and have tried to fix this problem for the past day or so but not sure how. I seem to be getting the following error whenever i try to save the output from my program to a file:

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space

The file itself is about 1.5mb.

I'm just curious is there any way of increasing the memory so i don't get this error?

Thanks

loki

[corlettk]

java.exe -Xmx256m

java.exe /? for more help

and PS: If you'd just googled java.lang.OutOfMemoryError you would have found this information in a few minutes.

[loki]

Thanks for the reply

I will check that out

loki

[loki]

java.exe -Xmx256m

java.exe /? for more help

and PS: If you'd just googled java.lang.OutOfMemoryError you would have found this information in a few minutes.

Hey sorry i don't mean to ask a stupid question, but do i just run that code in the command prompt?

[logicbug]

if your in windows you can add the Xmx256m to the Java Controller in the Control Panel. Otherwise yes, thats at the command line and you have to do it every time you run the application

[loki]

if your in windows you can add the Xmx256m to the Java Controller in the Control Panel. Otherwise yes, thats at the command line and you have to do it every time you run the application

Hey i tried to increase the memory via the java controller however it was already set at its maximum of 1GB. The file i was trying to save was actually 10MB and not 1.5 as i originally thought. Do you think 10MB is too large or is there anything else i can do?

Thanks

loki

[emceenugget]

i'm surprised it hasn't been addressed, but what exactly are you doing to exceed the heap space? it's not too often that this occurs unless you have a memory intensive program, and it might mean that you have objects that arent being garbage collected for whatever reason.

[loki]

i'm surprised it hasn't been addressed, but what exactly are you doing to exceed the heap space? it's not too often that this occurs unless you have a memory intensive program, and it might mean that you have objects that arent being garbage collected for whatever reason.

Hi i've basically got my program to read in a file then i'm trying to export the output to a text file. I've pasted my code below to give you an idea of what i'm trying to do.

import java.awt.*;
import java.awt.event.*;
import java.io.*;
 
import javax.swing.*;
 
public class Editor
    extends JFrame
    implements ActionListener {
  public static void main(String[] s) { new Editor(  ); }
 
  private JEditorPane textPane = new JEditorPane(  );
  
  public Editor(  ) {
    super("Editor v1.0");
    addWindowListener(new WindowAdapter(  ) {
      public void windowClosing(WindowEvent e) { System.exit(0); }
    });
    Container content = getContentPane(  );
    content.add(new JScrollPane(textPane), BorderLayout.CENTER);
    JMenu menu = new JMenu("File");
    menu.add(makeMenuItem("Open"));
    menu.add(makeMenuItem("Clean"));
    menu.add(makeMenuItem("Extract"));
    menu.add(makeMenuItem("Save"));
    menu.add(makeMenuItem("Quit"));
    JMenuBar menuBar = new JMenuBar(  );
    menuBar.add(menu);
    setJMenuBar(menuBar);
    setSize(300, 300);
    setLocation(200, 200);
    setVisible(true);
  }
  
  public void actionPerformed(ActionEvent e) {
    String command = e.getActionCommand(  );
    if (command.equals("Quit")) System.exit(0);
    else if (command.equals("Open")) loadFile(  );
    else if (command.equals("Save")) saveFile(  );
  }
  
  private void loadFile (  ) {
    JFileChooser chooser = new JFileChooser(  );
    int result = chooser.showOpenDialog(this);
    if (result == JFileChooser.CANCEL_OPTION) return;
    try {
      File file = chooser.getSelectedFile(  );
      java.net.URL url = file.toURL(  );
      textPane.setPage(url);
    }
    catch (Exception e) {
      textPane.setText("Could not load file: " + e);
    }
  }
  
  private void saveFile(  ) {
    JFileChooser chooser = new JFileChooser(  );
    int result = chooser.showSaveDialog(this);
    // Save file data...
    
    if (result == JFileChooser.CANCEL_OPTION) return; // if user click on Save button
	File file = chooser.getSelectedFile();
	try {
         BufferedWriter bw = new BufferedWriter(new FileWriter(file));
         bw.write(textPane.getText());
         bw.close();
      	}
    catch (Exception e) {
         JOptionPane.showMessageDialog(
            this,
            e.getMessage(),
            "File Error",
            JOptionPane.ERROR_MESSAGE
         );
    } 
  } 	
  
  private JMenuItem makeMenuItem( String name ) {
    JMenuItem m = new JMenuItem( name );
    m.addActionListener( this );
    return m;
  }
}

[emceenugget]

not familiar with file i/o myself, but you don't close the filewriter. could that present a problem?

[emceenugget]

i couldnt see any reason for your program to exceed memory bounds so i decided to run it myself and got no problems... sorry but cant see anything wrong or any cause for your issues

[loki]

i couldnt see any reason for your program to exceed memory bounds so i decided to run it myself and got no problems... sorry but cant see anything wrong or any cause for your issues

Hey no worries.

The program itself opens the 10mb file fine but its just when i try and save it to a text file that it gives me the error.

However i tried using a smaller file of 1.3mb and the program opened and saved it with no problems so it must just have issues with saving larger files however i need it to open larger files.

Thanks for the help anyway

Cheers

loki

[xcallmejudasx]

You can increase the size of your heapspace with 1 line of code, I however do not know that line of code. Perhaps someone can lend insight and hope it fixes the problem?

[loki]

You can increase the size of your heapspace with 1 line of code, I however do not know that line of code. Perhaps someone can lend insight and hope it fixes the problem?

Yeah i had a google to see if i could hard code it into my program to see if that would work, but can't find anything. :(

[neilcoffey]

You might want to CHECK the amount of free heap space from within your program to make sure it's really being set to what you think it is (see the methods on Runtime for querying memory).

[loki]

java.exe -Xmx256m

java.exe /? for more help

and PS: If you'd just googled java.lang.OutOfMemoryError you would have found this information in a few minutes.

Ahh got it working finally using the command below with the class name at the end of the command.

 java -Xmx256m

Thanks for your help

loki