FULL PRODUCT VERSION :
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Vista 32-bit:
Microsoft Windows [Version 6.0.6001]

A DESCRIPTION OF THE PROBLEM :
The following code causes a compiler error.

package test;

import javax.swing.DefaultListModel;
import javax.swing.JList;
import javax.swing.JPanel;

public class Test extends JPanel
{
private DefaultListModel m_listModel;
private JList m_list;

public void onUp()
{
final Object[] l_arItems;
final int l_iMinIndex;

l_arItems = m_list.getSelectedValues();

for (int i = 0, l_iLen = l_arItems.length; i < l_iLen; i++)
{
final Object l_selected = l_arItems[i];
final int l_iIndex = m_listModel.indexOf(l_selected);

m_listModel.remove(l_iIndex);

if (l_iIndex == 0 && i == 0)
{
m_listModel.addElement(l_selected);
break;
}
else
{
m_listModel.add(l_iIndex - 1, l_selected);
}
}

for (final Object l_selected : l_arItems)
{
final int l_iIndex = m_listModel.indexOf(l_selected);
m_list.addSelectionInterval(l_iIndex, l_iIndex);
}

l_iMinIndex = m_list.getSelectedIndex();

if (l_iMinIndex > -1)
m_list.scrollRectToVisible(m_list.getCellBounds(l_iMinIndex, l_iMinIndex));
}
}

Error:
test\Test.java:56: variable l_iMinIndex might already have been assigned
                l_iMinIndex = m_list.getSelectedIndex();
                ^
1 error

Compilation works if l_iMinIndex is not final or if the lines in the second for-each-loop are removed (even though the loop does not change the value of l_iMinIndex).


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. javac test\Test.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The final variable is not being assigned so compilation should not result in an error.
ACTUAL -
Compiler error:

"test\Test.java:56: variable l_iMinIndex might already have been assigned
                l_iMinIndex = m_list.getSelectedIndex();
                ^
1 error"

ERROR MESSAGES/STACK TRACES THAT OCCUR :
test\Test.java:56: variable l_iMinIndex might already have been assigned
                l_iMinIndex = m_list.getSelectedIndex();
                ^
1 error

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Remove the keyword "final".