FULL PRODUCT VERSION :
jdk1.4.2_02
Jdk1.5

ADDITIONAL OS VERSION INFORMATION :
Windows-XP

A DESCRIPTION OF THE PROBLEM :
I have a class in which i have added JSplitPane's into a JPanel. Now i can move multiple splitpanes upward but not downward. It seems splitpane can see the area above that but not down area.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Multiple Splitpanes should be draged downward
ACTUAL -
Multiple splitpanes can be dragged upward but not downward

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class LayeredPane extends JPanel {

private java.util.List splitList = new java.util.ArrayList();
private int orientation = JSplitPane.VERTICAL_SPLIT;
private JSplitPane lastSplit = null;
private Component lastComponent = null;
private boolean isEmpty = true;
public static int iLocation =0;

/**
* Make a new <tt>LayeredPane</tt> with the specified orientation, which
* needs to be either <tt>JSplitPane.VERTICAL_SPLIT</tt> or
* <tt>JSplitPane.HORIZONTAL_SPLIT</tt>
*
* @param orientation the orientation of the layers
*/
public LayeredPane(int orientation) {
super(new BorderLayout());
if (orientation != JSplitPane.VERTICAL_SPLIT
&& orientation != JSplitPane.HORIZONTAL_SPLIT) {
throw new IllegalArgumentException(
"Invalid parameter to LayeredPane, must be"
+ "either JSplitPane.VERTICAL_SPLIT or JSplitPane.HORIZONTAL_SPLIT");
}
this.orientation = orientation;
}

public void removeLayer(Component component) {
Component toRemove = null;
Component toKeep = null;
for (Iterator iter = splitList.iterator(); iter.hasNext();) {
JSplitPane sp = (JSplitPane) iter.next();

sp.setBorder(new EmptyBorder(0, 0, 0, 0));
Component tc = sp.getTopComponent();
Component bc = sp.getBottomComponent();
if (component.equals(tc)) {
toRemove = tc;
toKeep = bc;
break;
} else if (component.equals(bc)) {
toRemove = bc;
toKeep = tc;
break;
}
}
if (toRemove != null && toKeep != null) {
Container parent = toRemove.getParent().getParent();
parent.remove(toRemove.getParent());
parent.add(toKeep);
}
}

/**
* Add a layer to the <tt>LayeredPane</tt> that contains the component specified.
* The new layer will be added as the topmost, or leftmost component in the <tt>LayeredPane</tt>
* @param component the object to put in the new layer.
*/
public void addLayer(Component component) {
if (isEmpty) {
add(component);
lastComponent = component;
isEmpty = false;
return;
} else if (lastSplit == null) {
JSplitPane sp = new JSplitPane(orientation);

sp.setBorder(new EmptyBorder(0, 0, 0, 0));
sp.setBottomComponent(lastComponent);
sp.setTopComponent(component);
lastSplit = sp;

splitList.add(sp);
lastComponent = component;
this.add(sp, BorderLayout.CENTER);
return;
} else {
JSplitPane splitPane = new JSplitPane(orientation);
splitPane.setBorder(new EmptyBorder(0, 0, 0, 0));
lastSplit.setTopComponent(splitPane);
splitPane.setBottomComponent(lastComponent);
splitPane.setTopComponent(component);
splitList.add(splitPane);
lastSplit = splitPane;
lastComponent = component;
}


}

public void initSplitPane(Integer[] paneBnds)
{

for(int ii=0;ii<=paneBnds.length-1;ii++)
{
int divLoc = paneBnds[ii].intValue();
((JSplitPane)splitList.get(ii)).setDividerLocation(divLoc);
}


}
static int counter = 0;
public java.util.List getPanelList(){
return splitList;
}



}

Here we are creating the object of this layered pane.

public void initNestedPanel()

   {

    m_nestedPane = new LayeredPane(JSplitPane.VERTICAL_SPLIT);
   // JScrollPane scroll = new JScrollPane(lp);
    Vector vec = this.m_ButtonPane.getButtons();
  Integer[] paneBnds =(Integer[])
m_doc.getPref(EFSigniture.ICCMGR_SRVRPANESIZE);

     for (int ii = (tables.size()-1); ii >=0 ; ii --)

   {
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.setBorder(BorderFactory.createEtchedBorder());
        JPanel buttonComp = getButtonPanel((Component)vec.elementAt(ii));
        panel.add(buttonComp ,BorderLayout.WEST);
        panel.add((Component)tables.elementAt(ii),BorderLayout.CENTER);
panel.setMinimumSize(new
Dimension(this.getWidth()-60,110+(SystemConfiguration.isMacOS()?10:0)));
        //m_nestedPane.addLayer((Component)tables.elementAt(ii) );
        m_nestedPane.addLayer((Component)panel );
   }
}

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