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  1. JDK
  2. JDK-5082481

normal DnD program causes "FATAL ERROR in native method"

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 1.4.2, 1.4.2_07
    • Fix Version/s: 5.0u1
    • Component/s: client-libs
    • Subcomponent:
    • Resolved In Build:
      01
    • CPU:
      x86
    • OS:
      windows_xp

      Backports

        Description

        Name: js151677 Date: 08/04/2004


        FULL PRODUCT VERSION :
        java version "1.4.2_01"
        Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_01-b06)
        Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)


        ADDITIONAL OS VERSION INFORMATION :
        Microsoft Windows XP [版本 5.1.2600]

        (^^ it is the chinese version of XP)


        A DESCRIPTION OF THE PROBLEM :
        A simple drag operation on a customized JComponent causes a "FATAL ERROR" when we run the JVM with the option -Xcheck:jni ... here is the complete error message :

        FATAL ERROR in native method: Bad global or local ref passed to JNI
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(WToolkit.java:262)
        at java.lang.Thread.run(Thread.java:534)

        The bug can be reproduced using the "LabelDnD" demo on the page http://java.sun.com/docs/books/tutorial/uiswing/misc/example-1dot4/index.html#LabelDnD

        The same bug appear on my reduiced program (that I copy in the "Step to reproduce section")

        When I don't use the "-Xcheck:jni" option, my program randomly crash my IDE badly when I am using another native library (jogl), so I think the DnD corrupt the state of the JVM in a way.


        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        I have 2 programs that produce the same bug. Here is the first one :


        import java.awt.event.*;
        import javax.swing.*;

        public class BugComponent extends JLabel {

          public BugComponent()
          {
            setText("Drag me and Bug");
            setTransferHandler(new TransferHandler("text"));
            addMouseListener(new MouseAdapter() {
              public void mousePressed(MouseEvent event) {
                JComponent component = (JComponent) event.getSource();
                TransferHandler handler = component.getTransferHandler();
                handler.exportAsDrag(component, event, TransferHandler.COPY);
              }
            });
          }
          
          public static void main(String[] args)
          {
            JFrame f = new JFrame();
            f.getContentPane().add(new BugComponent());
            f.setSize(100, 100);
            f.show();
          }

        }



        The command line should be :

        java -Xcheck:jni BugComponent

        .. then, drag the label and the JVM stop and the message :

        FATAL ERROR in native method: Bad global or local ref passed to JNI
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(WToolkit.java:262)
        at java.lang.Thread.run(Thread.java:534)

        ... is displayed in the console


        The other program that produce the same effect is the "LabelDnD" demo from http://java.sun.com/docs/books/tutorial/uiswing/misc/example-1dot4/index.html#LabelDnD


        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        The JVM should not have any reason to crash. In the worst case (= if the java program is not right), it could be better if an explicit exception were thrown.

        ACTUAL -
        The DnD causes a FATAL ERROR. If the "-Xcheck:jni" option is not used, the JVM state is corrupted and crash later, sometime, randomly, every 5 minutes of intensive DnD use when using another native library (a GLFrame from jogl).


        ERROR MESSAGES/STACK TRACES THAT OCCUR :
        FATAL ERROR in native method: Bad global or local ref passed to JNI
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(WToolkit.java:262)
        at java.lang.Thread.run(Thread.java:534)



        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------

        import java.awt.event.*;
        import javax.swing.*;

        public class BugComponent extends JLabel {

          public BugComponent()
          {
            setText("Drag me and Bug");
            setTransferHandler(new TransferHandler("text"));
            addMouseListener(new MouseAdapter() {
              public void mousePressed(MouseEvent event) {
                JComponent component = (JComponent) event.getSource();
                TransferHandler handler = component.getTransferHandler();
                handler.exportAsDrag(component, event, TransferHandler.COPY);
              }
            });
          }
          
          public static void main(String[] args)
          {
            JFrame f = new JFrame();
            f.getContentPane().add(new BugComponent());
            f.setSize(100, 100);
            f.show();
          }

        }



        The command line should be :

        java -Xcheck:jni BugComponent


        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        None found.
        (Incident Review ID: 295664)
        ======================================================================

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                Assignee:
                agerasimsunw Alexander Gerasimov (Inactive)
                Reporter:
                jssunw Jitender S (Inactive)
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