This occurs only with b81 PIT build on Solaris and Linux platforms.

I have a java program which adds a TrayIcon to the system tray and then removes it. The java process does not exit even after the TrayIcon is removed. Below is the java program I execute:

import java.awt.*;
import java.awt.image.BufferedImage;

public class TrayIconTest {
    public static void main(String[] args) {
        try {
            SystemTray st = SystemTray.getSystemTray();
            BufferedImage image = new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
            Graphics gr = image.createGraphics();
            gr.setColor(Color.white);
            gr.fillRect(0, 0, 16, 16);
            TrayIcon icon = new TrayIcon(image);
            st.add(icon);
            st.remove(icon);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Below is the threaddump when the process does not exit:

2006-04-13 14:54:30
Full thread dump Java HotSpot(TM) Client VM (1.6.0-beta2-b78 mixed mode):

"AWT-XAWT" daemon prio=10 tid=0x08305400 nid=0x201f runnable [0x4ac33000..0x4ac33580]
   java.lang.Thread.State: RUNNABLE
        at sun.awt.X11.XToolkit.waitForEvents(Native Method)
        at sun.awt.X11.XToolkit.run(XToolkit.java:584)
        at sun.awt.X11.XToolkit.run(XToolkit.java:559)
        at java.lang.Thread.run(Thread.java:618)

"Java2D Disposer" daemon prio=10 tid=0x082da400 nid=0x201e in Object.wait() [0x4abb5000..0x4abb5700]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x423d04e8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
        - locked <0x423d04e8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
        at sun.java2d.Disposer.run(Disposer.java:125)
        at java.lang.Thread.run(Thread.java:618)

"Low Memory Detector" daemon prio=10 tid=0x080c4c00 nid=0x201c runnable [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x080c3400 nid=0x201b waiting on condition [0x00000000..0x4a732208]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x080c2000 nid=0x201a waiting on condition [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=10 tid=0x080a8400 nid=0x2019 in Object.wait() [0x4a627000..0x4a627480]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x423d06d0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
        - locked <0x423d06d0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x080a7400 nid=0x2018 in Object.wait() [0x4a5d6000..0x4a5d6600]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x423d0760> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:484)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
        - locked <0x423d0760> (a java.lang.ref.Reference$Lock)

"main" prio=10 tid=0x08058800 nid=0x2016 in Object.wait() [0x401c8000..0x401c88d8]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x423142d0> (a sun.awt.SunToolkit$1AWTInvocationLock)
        at java.lang.Object.wait(Object.java:484)
        at sun.awt.SunToolkit.executeOnEDTAndWait(SunToolkit.java:691)
        - locked <0x423142d0> (a sun.awt.SunToolkit$1AWTInvocationLock)
        at sun.awt.X11.XTrayIconPeer.dispose(XTrayIconPeer.java:221)
        at java.awt.TrayIcon.removeNotify(TrayIcon.java:662)
        at java.awt.SystemTray.remove(SystemTray.java:276)
        - locked <0x423d0a40> (a java.awt.SystemTray)
        at TrayIconTest.main(TrayIconTest.java:14)

"VM Thread" prio=10 tid=0x080a4000 nid=0x2017 runnable

"VM Periodic Task Thread" prio=10 tid=0x080c6400 nid=0x201d waiting on condition

JNI global references: 680

Heap
 def new generation total 960K, used 332K [0x422e0000, 0x423e0000, 0x427c0000) eden space 896K, 29% used [0x422e0000, 0x42323018, 0x423c0000)
  from space 64K, 100% used [0x423d0000, 0x423e0000, 0x423e0000)
  to space 64K, 0% used [0x423c0000, 0x423c0000, 0x423d0000)
 tenured generation total 4096K, used 292K [0x427c0000, 0x42bc0000, 0x462e0000)
   the space 4096K, 7% used [0x427c0000, 0x42809210, 0x42809400, 0x42bc0000)
 compacting perm gen total 12288K, used 5793K [0x462e0000, 0x46ee0000, 0x4a2e0000)
   the space 12288K, 47% used [0x462e0000, 0x46888790, 0x46888800, 0x46ee0000)
No shared spaces configured.