[native-image] ClassCastException when using SystemTray

[pquiring]

Describe the issue
Getting ClassCastException when using a SystemTray icon.

Steps to reproduce the issue
Sample code:

/**
 *
 * @author pquiring
 */

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

public class Main extends javax.swing.JFrame {

  SystemTray tray;
  Image image;
  TrayIcon icon;

  /**
   * Creates new form Main
   */
  public Main() {
    initComponents();
    image = new BufferedImage(16,16,BufferedImage.TYPE_INT_ARGB);
    icon = new TrayIcon(image);
    tray = SystemTray.getSystemTray();
    try {
      tray.add(icon);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * This method is called from within the constructor to initialize the form.
   * WARNING: Do NOT modify this code. The content of this method is always
   * regenerated by the Form Editor.
   */
  @SuppressWarnings("unchecked")
  // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
  private void initComponents() {

    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jButton1.setText("Test");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(java.awt.event.ActionEvent evt) {
        jButton1ActionPerformed(evt);
      }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(jButton1)
        .addContainerGap(337, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(jButton1)
        .addContainerGap(266, Short.MAX_VALUE))
    );

    pack();
  }// </editor-fold>//GEN-END:initComponents

  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
    // TODO add your handling code here:
  }//GEN-LAST:event_jButton1ActionPerformed

  /**
   * @param args the command line arguments
   */
  public static void main(String args[]) {
    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        new Main().setVisible(true);
      }
    });
  }

  // Variables declaration - do not modify//GEN-BEGIN:variables
  private javax.swing.JButton jButton1;
  // End of variables declaration//GEN-END:variables
}

Describe GraalVM and your environment:

• GraalVM version 21.1.0
• JDK major version: 11
• OS: Windows 10
• Architecture: AMD64

More details
Exception:

Exception in thread "AWT-Windows": java.lang.ClassCastException
java.lang.ClassCastException: java.awt.TrayIcon cannot be cast to java.awt.Component
        at com.oracle.svm.jni.JNIJavaCallWrappers.jniInvoke_VA_LIST:Ljava_awt_event_MouseEvent_2_0002e_0003cinit_0003e_00028Ljava_awt_Component_2IJIIIIIIZI_00029V(JNIJavaCallWrappers.java:0)
        at sun.awt.windows.WToolkit.eventLoop(WToolkit.java)
        at sun.awt.windows.WToolkit.run(WToolkit.java:305)
        at java.lang.Thread.run(Thread.java:829)
        at com.oracle.svm.core.thread.JavaThreads.threadStartRoutine(JavaThreads.java:553)
        at com.oracle.svm.core.windows.WindowsJavaThreads.osThreadStartRoutine(WindowsJavaThreads.java:138)

NOTE : You must copy ${java.home}\lib\*font* to .\lib

Making great progress with AWT!

[pquiring]

I think the issue is here:
https://github.com/graalvm/labs-openjdk-11/blob/master/src/java.desktop/windows/native/libawt/windows/awt_TrayIcon.cpp#L521

[munishchouhan]

@pquiring AWT support on windows is still in progress
#3084

[munishchouhan]

Closing this as there is no activity in the last 30 days,
Please follow #3084
Once its implemented, please try again

[n1kub]

Facing same issue. @pquiring did you solve it? Is there any updates or maybe you've found any workaround?

[pquiring]

No, problem persists. I've even opened ticket with JDK to get them to fix it there. No change.
The problem is TrayIcon is cast into an AWT Component in native code but it does NOT derive from Component.
Also tried to change TrayIcon to derive from Component in labsjdk but get compiler errors.
If I get it to work I'll post a revised JDK somewhere.

[n1kub]

@pquiring Thanks for your answer! Shall we open new issue? Maybe the'll pay attention to it now...

[pquiring]

@n1kub - I opened several tickets against the JDK itself, one was just last month.

[n1kub]

@pquiring I found only this one
labs-openjdk-11 issue №4

[n1kub]

@pquiring is this your ticket?

[pquiring]

Yes.

[pquiring]

I've created a fix (hack) around this issue. It works!

https://github.com/pquiring/labs-openjdk-20/releases/tag/fix-001

[pquiring]

The tray icon works, but now the popup menu is in another language ?

[MartinHelwig]

@pquiring, try using JPopupMenu and JMenuItem... this displays correct labels.

[pquiring]

Unfortunately TrayIcon does not support JPopupMenu. There is a workaround using addMouseListener() but my hack disables mouse events.

[MartinHelwig]

OK, I didn't use your hack, I only use the dev version graalvm-community-openjdk-17.0.7+4.1 and get bad language, than I changed to JPopupMenu with the workaround and it's working for me.

[pquiring]

The latest graal 23.1.0 dev builds have fixed this issue. See #6524

[GPopZach]

I've created a fix (hack) around this issue. It works!

https://github.com/pquiring/labs-openjdk-20/releases/tag/fix-001

I still have the issue right now, can you please provide the hack you used to get this working? @pquiring

[pquiring]

graal 23.1.0 should work now, no need to 'hack' it.

[n1kub]

Language is ok, but for me it displays kinda shrinked