Name: gm110360 Date: 10/07/2002


FULL PRODUCT VERSION :
java version "1.4.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)


FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
In the implementation of the table model row sorter
(shuttle sort), an attempt to clone() an array of integers
throws a "java.lang.ClassDefNotFoundError: int[]". This
popped up after development of unrelated code within the
same package. The call was never the cause of an error in
the past, and no change in the JRE preceded the bug. The
identical bug also occurred on a different JRE, and a
different OS when using the same package of code.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NoClassDefFoundError: int[]
at sagespace.plugins.sage.LibraryLoader.<init>(LibraryLoader.java:39)
at sagespace.plugins.sage.SAGEToolBar.menu__actionPerformed
(SAGEToolbar.java:749)
at sagespace.plugins.sage.SAGEToolBar.access$1(SAGEToolbar.java:70)
at sagespace.plugins.sage.SAGEToolBar$3.actionPerformed
(SAGEToolbar.java:420)
at javax.swing.AbstractButton.fireActionPerformed
(AbstractButton.java:1767)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed
(AbstractButton.java:1820)
at javax.swing.DefaultButtonModel.fireActionPerformed
(DefaultButtonModel.java:419)
at javax.swing.DefaultButtonModel.setPressed
(DefaultButtonModel.java:257)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased
(BasicButtonListener.java:258)
at java.awt.AWTEventMulticaster.mouseReleased
(AWTEventMulticaster.java:227)
at java.awt.Component.processMouseEvent(Component.java:5021)
at java.awt.Component.processEvent(Component.java:4818)
at java.awt.Container.processEvent(Container.java:1525)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1582)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.LightweightDispatcher.retargetMouseEvent
(Container.java:3359)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3074)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3004)
at java.awt.Container.dispatchEventImpl(Container.java:1568)
at java.awt.Window.dispatchEventImpl(Window.java:1581)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy
(EventDispatchThread.java:191)
at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)



REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Isolated the problem as follows: in the above stack trace, the LibraryLoader
object contains:

public class LibraryLoader extends JInternalFrame {
  private MyDataSet _dataset = new MyDataSet( Library.class );
}

which, when removed, stops the error. Within MyDataSet, the following, is the
source of the error:

public class MyDataSet implements TableModel {
  private int[] _indexes;
  private void sort() {
    checkModel();
    _compares = 0;
    shuttlesort( (int[])_indexes.clone(), _indexes, 0, _indexes.length );
  }
}

The specific problem is the (int[])_indexes.clone() call. The stack trace was
never specific in identifying this as the problem.
---------- END SOURCE ----------

CUSTOMER WORKAROUND :
Replacing:
shuttlesort( (int[])_indexes.clone(), _indexes, 0,
_indexes.length );

with:
int[] from = new int[_indexes.length];
System.arraycopy( _indexes, 0, from, 0, from.length );
shuttlesort( from, _indexes, 0, _indexes.length );

solves the problem.
(Review ID: 165461)
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