FULL PRODUCT VERSION :
Fedora 17 - java version " 1.7.0_19 "
OpenJDK Runtime Environment (fedora-2.3.9.4.fc17-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

Fedora 18 - java version " 1.7.0_19 "
OpenJDK Runtime Environment (fedora-2.3.9.3.fc18-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

OpenSUSE 12.3 - java version " 1.7.0_15 "
OpenJDK Runtime Environment (IcedTea 2.3.7) (suse-8.3.1-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Fedora 17- Linux 3.8.11-100.fc17.x86_64 #1 SMP Wed May 1 19:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Fedora 18 - Linux 3.8.11-200.fc18.x86_64 #1 SMP Wed May 1 19:44:27 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

OpenSUSE 12.3 - Linux 3.7.10-1.1-desktop #1 PREEMPT Thu Feb 28 15:06:29 x86_64 x86_64 x86_64 GNU_LINUX

EXTRA RELEVANT SYSTEM CONFIGURATION :
All operating systems were using the default Gnome 3 desktop session environment and the OpenJDK that is available in their package repositories.

A DESCRIPTION OF THE PROBLEM :
I create a java.awt.TrayIcon instance and add a simple MouseListener using the available addMouseListener() method. I then add the TrayIcon to the SystemTray object and the I attempt to right-click the displayed TrayIcon in the system notification area. The installed MouseListener does not receive the expected MouseEvent that signals the mouse was pressed. The installed MouseListener does not receive the expected MouseEvent that signals the mouse was clicked when I left-click on the displayed TrayIcon.

The PopupMenu that the TrayIcon is created with also does not display when I right-click on the TrayIcon.

REGRESSION. Last worked in version 7

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.) Create a java.awt.TrayIcon with a PopupMenu
2.) Install a MouseListener onto the TrayIcon instance created in (1)
3.) Add TrayIcon instance to SystemTray object
4.) Right or left-click on the displayed TrayIcon

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would expect to see the MouseListener#mousePressed() method called when I right-click on the TrayIcon and I would expect the see the MouseListener#mousePressed(), MouseListener#mouseReleased(), and MouseListener#mouseClicked() method called (in that order) when I left-click on the TrayIcon.

I would also expect to see an installed PopupMenu displayed when I right-click on the TrayIcon.
ACTUAL -
No MouseListener methods on the installed MouseListener instance are called. I also do not see an installed PopupMenu displayed when I right-click the TrayIcon.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
None generated.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.ImageIcon;

public class TrayTest
{
  
  public static void main(String[] args) throws Exception
  {
    MenuItem mi1 = new MenuItem( " Test Action 1 " );
    MenuItem mi2 = new MenuItem( " Test Action 2 " );
    MenuItem mi3 = new MenuItem( " Exit " );
    
    mi1.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.out.println( " Test Action 1 - actionPerformed() " );
      }
    });
    
    mi2.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.out.println( " Test action 2 - actionPerformed() " );
      }
    });
    
    mi3.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.exit( 0 );
      }
    });
    
    PopupMenu pm = new PopupMenu();
    pm.add( mi1 );
    pm.add( mi2 );
    pm.addSeparator();
    pm.add( mi3 );
    
    ImageIcon icon = new ImageIcon( " ./icon.png " );
    TrayIcon trayIcon = new TrayIcon( icon.getImage(), " Test System Tray " , pm );
    
    trayIcon.addMouseListener( new MouseListener()
    {
      @Override
      public void mouseClicked( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseClicked() " );
      }

      @Override
      public void mousePressed( MouseEvent e )
      {
        System.out.println( " TrayIcon - mousePressed() " );
      }

      @Override
      public void mouseReleased( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseReleased() " );
      }

      @Override
      public void mouseEntered( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseEntered() " );
      }

      @Override
      public void mouseExited( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseExited() " );
      }
    });
    
    SystemTray.getSystemTray().add( trayIcon );
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I have found that you can snoop on all of the mouse events in the application and somewhat detect what the mouse has clicked on by installing an AWTEventListener on the Toolkit instance using the Toolkit#addAWTEventListener() method and filtering for MouseEvents:

import java.awt.AWTEvent;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.AWTEventListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.ImageIcon;

public class TrayTest
{
  
  public static void main(String[] args ) throws Exception
  {
    MenuItem mi1 = new MenuItem( " Test Action 1 " );
    MenuItem mi2 = new MenuItem( " Test Action 2 " );
    MenuItem mi3 = new MenuItem( " Exit " );
    
    mi1.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.out.println( " Test Action 1 - actionPerformed() " );
      }
    });
    
    mi2.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.out.println( " Test action 2 - actionPerformed() " );
      }
    });
    
    mi3.addActionListener( new ActionListener()
    {
      @Override
      public void actionPerformed( ActionEvent e )
      {
        System.exit( 0 );
      }
    });
    
    PopupMenu pm = new PopupMenu();
    pm.add( mi1 );
    pm.add( mi2 );
    pm.addSeparator();
    pm.add( mi3 );
    
    ImageIcon icon = new ImageIcon( " ./icon.png " );
    TrayIcon trayIcon = new TrayIcon( icon.getImage(), " Test System Tray " , pm );
    
    trayIcon.addMouseListener( new MouseListener()
    {
      @Override
      public void mouseClicked( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseClicked() " );
      }

      @Override
      public void mousePressed( MouseEvent e )
      {
        System.out.println( " TrayIcon - mousePressed() " );
      }

      @Override
      public void mouseReleased( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseReleased() " );
      }

      @Override
      public void mouseEntered( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseEntered() " );
      }

      @Override
      public void mouseExited( MouseEvent e )
      {
        System.out.println( " TrayIcon - mouseExited() " );
      }
    });
    
    // Hack to snoop on global mouse events:
    
    Toolkit.getDefaultToolkit().addAWTEventListener( new AWTEventListener()
    {
      @Override
      public void eventDispatched( AWTEvent event )
      {
        if ( event.getID() == MouseEvent.MOUSE_CLICKED )
        {
          System.out.println( " MouseClicked " );
        }
        else if ( event.getID() == MouseEvent.MOUSE_PRESSED )
        {
          System.out.println( " MousePressed " );
        }
        else if ( event.getID() == MouseEvent.MOUSE_RELEASED )
        {
          System.out.println( " MouseReleased " );
        }
        else if ( event.getID() == MouseEvent.MOUSE_ENTERED )
        {
          System.out.println( " MouseEntered " );
        }
        else if ( event.getID() == MouseEvent.MOUSE_EXITED )
        {
          System.out.println( " MouseExited " );
        }
      }
    }, MouseEvent.MOUSE_EVENT_MASK );
    
    SystemTray.getSystemTray().add( trayIcon );
  }
}

This is obviously not a perfect solution, but it does the job until the bug can be resolved. I have dug into the source code and it appears that the XTrayIconEmbeddedFrame is the source of MouseEvents on the non-functional platform instead of the TrayIconCanvas. If you consult XTrayIconPeer.java, a MouseListener is installed on the TrayIconCanvas to capture and process any MouseEvent's and display the PopupMenu. It appears that the TrayIconCanvas is not generating the MouseEvent's on the non-functionality platforms, and thus why installed MouseListener's are not receiving events.