Exception in thread "AWT-EventQueue-0" org.eclipse.swt.SWTException: Invalid thread access

[Fictus De la Pjedero]

Hey,

For my application I have created a menu in the system tray. When you click left you get some dynamic data and when you click right on my menu you get a screen to add a new dynamic menuitem to my system tray menu. but when I try to add something to that menu I get this error:

Exception in thread "AWT-EventQueue-0" org.eclipse.swt.SWTException: Invalid thread access


this is my code:

 import java.awt.Frame;
import java.awt.Dimension;
import javax.swing.JButton;
import java.awt.BorderLayout;
import javax.swing.SwingConstants;
import java.awt.event.KeyEvent;
import java.awt.Rectangle;
import javax.swing.JTextField;
import javax.swing.JLabel;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Test3 extends Frame {

	private static final long serialVersionUID = 1L;
	private JButton jButton = null;
	private JTextField txtInput = null;
	private JLabel lblInput = null;
	private JLabel lblResult2 = null;
	static Display display = new Display ();
	static Shell shell = new Shell (display);  //  @jve:decl-index=0:
	static MenuItem testMi = null;
	/**
	 * This method initializes jButton	
	 * 	
	 * @return javax.swing.JButton	
	 */
	private JButton getJButton() {
		if (jButton == null) {
			jButton = new JButton();
			jButton.setHorizontalTextPosition(SwingConstants.CENTER);
			jButton.setMnemonic(KeyEvent.VK_UNDEFINED);
			jButton.setBounds(new Rectangle(504, 246, 97, 29));
			jButton.setText("Click");
			//jButton.setSize(0,80);
			//jButton.addActionListener(new java.awt.event.ActionListener());
			jButton.addMouseListener(new java.awt.event.MouseAdapter() {
				public void mouseClicked(java.awt.event.MouseEvent e) {
					//System.out.println("mouseClicked()"); // TODO Auto-generated Event stub mouseClicked()
					lblResult2.setText(txtInput.getText());
					testMi.setText("Dynamic");
				}
			});
			//jButton.setRolloverEnabled(false);
			//jButton.setPreferredSize(new Dimension(50, 10));
		}
		return jButton;
	}

	/**
	 * This method initializes txtInput	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getTxtInput() {
		if (txtInput == null) {
			txtInput = new JTextField();
			txtInput.setBounds(new Rectangle(187, 73, 416, 22));
		}
		return txtInput;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Test3 application = new Test3();
		application.initialize();
		application.setVisible(true);
		
		Image image = new Image (display, 16, 16);
		final Tray tray = display.getSystemTray ();
		if (tray == null) {
			System.out.println ("The system tray is not available");
		} 
		else {
			final TrayItem item = new TrayItem (tray, SWT.NONE);
			item.setToolTipText("SWT TrayItem");
			item.addListener (SWT.Show, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("show");
				}
			});
			item.addListener (SWT.Hide, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("hide");
				}
			});
			final Menu mainMenu = new Menu (shell, SWT.POP_UP);
			for (int i =0; i <= 3; i++){
				MenuItem mi = new MenuItem(mainMenu, SWT.PUSH);
				mi.setText("Main Menu Item " + i);
				mi.setEnabled(false);
				if (i == 3 ){
					mi.setEnabled(true);
					mi.setText("Exit program");
					mi.addListener(SWT.Selection, new Listener (){
						public void handleEvent (Event event){
							System.exit(0);
						}
					});
				}
			}
			
			testMi = new MenuItem(mainMenu, SWT.PUSH);
			testMi.setText("Static text");
			
			
			item.addListener (SWT.Selection, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("selection");
					mainMenu.setVisible(true);
				}
			});			
			item.addListener (SWT.DefaultSelection, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("default selection");
				}
			});
			final Menu menu = new Menu (shell, SWT.POP_UP);
			for (int i = 0; i < 8; i++) {
				MenuItem mi = new MenuItem (menu, SWT.PUSH);
				mi.setText ("Item" + i);
				mi.addListener (SWT.Selection, new Listener () {
					public void handleEvent (Event event) {
						System.out.println("selection " + event.widget);
					}
				});
				if (i == 0) menu.setDefaultItem(mi);
			}
			item.addListener (SWT.MenuDetect, new Listener () {
				public void handleEvent (Event event) {
					menu.setVisible (true);
					
				}
			});
			item.setImage (image);
		}
		shell.setBounds(50, 50, 300, 200);
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		image.dispose ();
		display.dispose ();

	}

	/**
	 * This is the default constructor
	 */
	public Test3() {
		super();
		initialize();
	}

	/**
	 * This method initializes this
	 * 
	 * @return void
	 */
	private void initialize() {
		lblResult2 = new JLabel();
		lblResult2.setBounds(new Rectangle(16, 117, 586, 30));
		lblResult2.setText("");
		lblInput = new JLabel();
		lblInput.setBounds(new Rectangle(13, 70, 168, 26));
		lblInput.setText(" Voer een lappie text in:");
		this.setLayout(null);
		this.setSize(627, 302);
		this.setTitle("Frame");

		this.setVisible(true);
		this.add(getJButton(), null);
		this.add(getTxtInput(), null);
		this.add(lblInput, null);
		this.add(lblResult2, null);
		this.addWindowListener(new java.awt.event.WindowAdapter() {
			public void windowClosing(java.awt.event.WindowEvent e) {
				//lblResult2.setText("So you wanna close this window.. ;-) ");
				System.exit(0);
			}
		});
	}

}  //  @jve:decl-index=0:visual-constraint="10,10"
   

When you run this, you see a nice menu in the system tray..
add some text in the screen that popup and click on save.. now you see the error.. (In this example ill trie to change the staic menu into a dynamic one)

[Rob Spoor]

Ben,

Please read your private messages.

You might want to check this thread: https://coderanch.com/t/430935/Swing-AWT-SWT-JFace/java/Getting-SWTException-Invalid-thread-access

[Fictus De la Pjedero]

Hey,

I've followed your link and I found some example code, but I do not quite understand why it's not working..

Sample code:

 import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class santest implements Runnable {

	private static Display display;

	private int countDown = 5;
	
	public String toString() {
		return "#" + Thread.currentThread().getName() +
		": " + countDown;
	}
	
	public void test() {
		System.out.println("I came here (test)");
		// this will only use the current display
		display.syncExec (new Runnable () {
			
			public void run () {
				System.out.println("I came here (2nd run)");
				GC gc = new GC(display);
				final org.eclipse.swt.graphics.Image image = new
				org.eclipse.swt.graphics.Image(display, display.getBounds());
				gc.copyArea(image, 0, 0);
				gc.dispose();
				
			}
		});
		/* Take the screen shot */
		
	}

	public void run() {
		while(true) {
			System.out.println(this);
			System.out.println("I came here (run)");
			test();
			
			if(--countDown == 0) return;
		}
	}
	
	public static void main(String[] args) {
		// here we create the Display in main thread
		display = new Display();


		for(int i = 1; i <= 5; i++)
			new Thread(new santest(), "" + i).start();
		// Output is like SimpleThread.java
	}
}
   

If you run this, you will see that "I came here (2nd run)" is not printed..
Can anybody explain why that is and how you can make it run..

(i've tried to implemented it into my code and found out that my menu code is not fired :

  import java.awt.Frame;
import java.awt.Dimension;
import javax.swing.JButton;
import java.awt.BorderLayout;
import javax.swing.SwingConstants;
import java.awt.event.KeyEvent;
import java.awt.Rectangle;
import javax.swing.JTextField;
import javax.swing.JLabel;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Test3 extends Frame implements Runnable {

	private static final long serialVersionUID = 1L;
	private JButton jButton = null;
	private JTextField txtInput = null;
	private JLabel lblInput = null;
	private JLabel lblResult2 = null;
	static Display display;
	
	static MenuItem testMi = null;
	/**
	 * This method initializes jButton	
	 * 	
	 * @return javax.swing.JButton	
	 */
	private JButton getJButton() {
		if (jButton == null) {
			jButton = new JButton();
			jButton.setHorizontalTextPosition(SwingConstants.CENTER);
			jButton.setMnemonic(KeyEvent.VK_UNDEFINED);
			jButton.setBounds(new Rectangle(504, 246, 97, 29));
			jButton.setText("Click");
			//jButton.setSize(0,80);
			//jButton.addActionListener(new java.awt.event.ActionListener());
			jButton.addMouseListener(new java.awt.event.MouseAdapter() {
				public void mouseClicked(java.awt.event.MouseEvent e) {
					//System.out.println("mouseClicked()"); // TODO Auto-generated Event stub mouseClicked()
					lblResult2.setText(txtInput.getText());
					testMi.setText("Dynamic");
				}
			});
			//jButton.setRolloverEnabled(false);
			//jButton.setPreferredSize(new Dimension(50, 10));
		}
		return jButton;
	}

	/**
	 * This method initializes txtInput	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getTxtInput() {
		if (txtInput == null) {
			txtInput = new JTextField();
			txtInput.setBounds(new Rectangle(187, 73, 416, 22));
		}
		return txtInput;
	}

	/**
	 * @param args
	 */
	private void BuildMenu(){
		Shell shell = new Shell (display);  //  @jve:decl-index=0:
		Image image = new Image (display, 16, 16);
		final Tray tray = display.getSystemTray ();
		if (tray == null) {
			System.out.println ("The system tray is not available");
		} 
		else {
			final TrayItem item = new TrayItem (tray, SWT.NONE);
			item.setToolTipText("SWT TrayItem");
			item.addListener (SWT.Show, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("show");
				}
			});
			item.addListener (SWT.Hide, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("hide");
				}
			});
			final Menu mainMenu = new Menu (shell, SWT.POP_UP);
			for (int i =0; i <= 3; i++){
				MenuItem mi = new MenuItem(mainMenu, SWT.PUSH);
				mi.setText("Main Menu Item " + i);
				mi.setEnabled(false);
				if (i == 3 ){
					mi.setEnabled(true);
					mi.setText("Exit program");
					mi.addListener(SWT.Selection, new Listener (){
						public void handleEvent (Event event){
							System.exit(0);
						}
					});
				}
			}
			
			testMi = new MenuItem(mainMenu, SWT.PUSH);
			testMi.setText("Static text");
			
			
			item.addListener (SWT.Selection, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("selection");
					mainMenu.setVisible(true);
				}
			});			
			item.addListener (SWT.DefaultSelection, new Listener () {
				public void handleEvent (Event event) {
					System.out.println("default selection");
				}
			});
			final Menu menu = new Menu (shell, SWT.POP_UP);
			for (int i = 0; i < 8; i++) {
				MenuItem mi = new MenuItem (menu, SWT.PUSH);
				mi.setText ("Item" + i);
				mi.addListener (SWT.Selection, new Listener () {
					public void handleEvent (Event event) {
						System.out.println("selection " + event.widget);
					}
				});
				if (i == 0) menu.setDefaultItem(mi);
			}
			item.addListener (SWT.MenuDetect, new Listener () {
				public void handleEvent (Event event) {
					menu.setVisible (true);
					
				}
			});
			item.setImage (image);
		}
		shell.setBounds(50, 50, 300, 200);
		//shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		image.dispose ();
		display.dispose ();
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//Test3 application = new Test3();
		//application.initialize();
		//application.setVisible(true);
		
		display = new Display();
		new Thread(new Test3()).start();		

	}

	/**
	 * This is the default constructor
	 */
	public Test3() {
		super();
		
	}

	/**
	 * This method initializes this
	 * 
	 * @return void
	 */
	private void initialize() {
		lblResult2 = new JLabel();
		lblResult2.setBounds(new Rectangle(16, 117, 586, 30));
		lblResult2.setText("");
		lblInput = new JLabel();
		lblInput.setBounds(new Rectangle(13, 70, 168, 26));
		lblInput.setText(" Voer een lappie text in:");
		this.setLayout(null);
		this.setSize(627, 302);
		this.setTitle("Frame");

		this.setVisible(true);
		this.add(getJButton(), null);
		this.add(getTxtInput(), null);
		this.add(lblInput, null);
		this.add(lblResult2, null);
		this.addWindowListener(new java.awt.event.WindowAdapter() {
			public void windowClosing(java.awt.event.WindowEvent e) {
				//lblResult2.setText("So you wanna close this window.. ;-) ");
				System.exit(0);
			}
		});
	}

	@Override
	public void run() {
		
			display.syncExec (new Runnable () {
				public void run () {
					BuildMenu();
					initialize();
				}
			});
		
	}

}  //  @jve:decl-index=0:visual-constraint="10,10"
  

So I've come from one proble into another one..

(but I still want to see the first one to be solved: Exception in thread "AWT-EventQueue-0" org.eclipse.swt.SWTException: Invalid thread access exception)

[Fictus De la Pjedero]

Anyone?