How to find where in my program is the error ?

I use NetBeans and wrote a Java program, it runs fine except it outputs an error message while my program is running, but it doesn't say which line of my program is wrong, the error message looks like this :
=================================================================================
compile-single:
run-single:
Interval_In_Minutes = 1
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 127
at javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java:1349)
at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI.java:1292)
at javax.swing.plaf.basic.BasicListUI.getPreferredSize(BasicListUI.java:559)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.JList.getScrollableTracksViewportWidth(JList.java:2706)
at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:786)
at java.awt.Container.layout(Container.java:1432)
at java.awt.Container.doLayout(Container.java:1421)
at java.awt.Container.validateTree(Container.java:1519)
at java.awt.Container.validate(Container.java:1491)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:635)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:127)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD SUCCESSFUL (total time: 6 minutes 54 seconds)
=================================================================================
How can I find out which line of my code caused the error ?
Frank

Yes, it seems it's complaining about some array index out of bounds error, but the line number 127 is definitely not referring to my code, because my code looks like this at around line 127 :
=======================================================================================
122 JPanel Input_File_Panel=new JPanel(A_FlowLayout);
123 Input_File_Panel.setPreferredSize(new Dimension(List_Width+Text_Area_Width+30,50+ScrollPane_Height));
124
125 JPanel Input_File_Path_Panel=new JPanel();
126
127 Input_File_Dir_Button.setPreferredSize(new Dimension(List_Width,20));
128 Input_File_Dir_Button.addActionListener(new ActionListener()
129 {
130 public void actionPerformed(ActionEvent e)
131 {
132 try
========================================================================================
As you can see there is no array involved, usually it would refer to my program's name and point to the line number in it, but it's not doing that here, that's why I can't figure out where in my code went wrong.
Frank

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