Name: el35337 Date: 06/04/98


The documentation for SwingUtilities.invokeAndWait claims that it will throw an InvocationTargetException if the Runnable object throws an uncaught exception during its execution. This doesn't appear to be happening.

import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;

public class InvokeAndWaitTest
{
    public static void main( String[] args )
    {
        JFrame frame = new JFrame( "Invoke And Wait Test" );
        JButton run = new JButton( "Run" );
        run.addActionListener( new ButtonHandler() );
        frame.getContentPane().add( run, BorderLayout.SOUTH );
        frame.setSize( 300, 200 );
        frame.setVisible( true );
    }
}

// This class will always throw an exception when run.
class ExceptionRunner implements Runnable
{
    public void run()
    {
        System.out.println( "running..." );
        throw new RuntimeException();
    }
}

class ButtonHandler implements ActionListener
{
    public void actionPerformed( ActionEvent evt )
    {
        // start a new thread, and run the ExceptionRunner on the AWT Thread

        Runnable swingRunner =
                new Runnable()
                {
                    public void run()
                    {
                        try
                        {
                            SwingUtilities.invokeAndWait( new ExceptionRunner() );

                            // shouldn't make it here
                            System.out.println( "shouldn't reach this point" );
                        }
                        catch( java.lang.reflect.InvocationTargetException e )
                        {
                            System.err.println( "caught exception " + e );
                        }
                        catch( InterruptedException e2 )
                        {
                            System.err.println( "caught exception " + e2 );
                        }
                    }
                };
                
        new Thread( swingRunner ).start();
    }
}
(Review ID: 32821)
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