help to debug exception

Posted on 2007-07-23
Medium Priority
Last Modified: 2010-08-05
Hello there,

I am getting is error when i traverse on a Jtree.what could be the problem.please throw some light on it.

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
      at java.util.Vector.get(Unknown Source)
      at src.com.victa.TreeTableInternalFrame.initParentsTables(TreeTableInternalFrame.java:3542)
      at src.com.victa.TreeTableInternalFrame.access$29(TreeTableInternalFrame.java:3535)
      at src.com.victa.TreeTableInternalFrame$1.mousePressed(TreeTableInternalFrame.java:341)
      at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
      at java.awt.Component.processMouseEvent(Unknown Source)
      at javax.swing.JComponent.processMouseEvent(Unknown Source)
      at java.awt.Component.processEvent(Unknown Source)
      at java.awt.Container.processEvent(Unknown Source)
      at java.awt.Component.dispatchEventImpl(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
      at java.awt.Container.dispatchEventImpl(Unknown Source)
      at java.awt.Window.dispatchEventImpl(Unknown Source)
      at java.awt.Component.dispatchEvent(Unknown Source)
      at java.awt.EventQueue.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.run(Unknown Source)

this is a block of code for line 341.the line is indicated in the code below.
case BaseRow.LINECARD_TYPE : {
                                           changeCard(rightCardPanel, CITY_CO_DSLAM_PANEL);
                                           Vector col = getNodesThisLevel(linecardCollect, select);
                                           int selIndex = Collections.binarySearch(col, select, new PrimaryKeyComparator());
                                           if (!isSameBranch(select,lastSelectedNode))
                                           linecardTable.setRowSelectionInterval(selIndex, selIndex);
                                           initParentsTables(select);      ///////////line341////////////

block of code between line 3535 - 3542

private void initParentsTables(DefaultMutableTreeNode selNode) {
          BaseRow selRow = (BaseRow)selNode.getUserObject();
          int index = -1;
          switch (selRow.getType()) {
                case BaseRow.LINECARD_TYPE :
                      index = findParentElement(dslamCollect, selNode);
                      DefaultMutableTreeNode pNode = (DefaultMutableTreeNode)dslamCollect.get(index);  /////////////////////////////////line 3542//////////////////////
                      Vector cod = getNodesThisLevel(dslamCollect, pNode);
                      index = findParentElement(cod, selNode);
                      dslamTable.setRowSelectionInterval(index, index);
                      selNode = pNode;
                case BaseRow.DSLAM_TYPE :
                      index = findParentElement(coCollect, selNode);
                      pNode = (DefaultMutableTreeNode)coCollect.get(index);
                      Vector cov = getNodesThisLevel(coCollect, pNode);
                      index = findParentElement(cov, selNode);
                      coTable.setRowSelectionInterval(index, index);
                      selNode = pNode;
                case BaseRow.CO_TYPE :
                            index = findParentElement(cityCollect, selNode);
                      else if(privilege==2 || privilege==3)
                            index = findParentElement(cityPrivilegeCollect, selNode);
                      cityTable.setRowSelectionInterval(index, index);
                      int coId = ((CoRow)selNode.getUserObject()).getCoId().intValue();
                         fillThumbnails(true, coId);
Question by:zolf

Expert Comment

ID: 19553525
Check to make sure that index != -1 before passing it to any functions.  That seems to be the most likely source of the exception.
LVL 92

Assisted Solution

objects earned 880 total points
ID: 19553569
>                       index = findParentElement(dslamCollect, selNode);

its failing to find the index of the parent element, check that method
LVL 12

Accepted Solution

keyurkarnik earned 1120 total points
ID: 19553794
The findParentElement(dslamCollect, selNode) is returning -1

Due to this, dslamCollect.get(index) is becoming dslamCollect.get(-1), hence the ArrayIndexOutOfBounds exception.

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LVL 12

Expert Comment

ID: 19553795
Either try debugging through the findParentElement or try pasting the code here!!

Author Comment

ID: 19553925

private int findParentElement(Vector collect, DefaultMutableTreeNode node) {
          BaseRow row = (BaseRow)node.getUserObject();
          int index = -1;
          for (int i = 0; i < collect.size(); i++) {
                DefaultMutableTreeNode currNode = (DefaultMutableTreeNode)collect.get(i);
                BaseRow currRow = (BaseRow)currNode.getUserObject();
                if (row.getForeignKey() == currRow.getPrimaryKey()) {
                      index = i;
          return index;
LVL 92

Expert Comment

ID: 19553945
>                 if (row.getForeignKey() == currRow.getPrimaryKey()) {


                if (row.getForeignKey().equals(currRow.getPrimaryKey())) {
LVL 12

Expert Comment

ID: 19553948
if collect.size() == 0,
it will never enter the for loop

So, the index returned will be -1.

So the only thing you can do is this :

index = findParentElement(dslamCollect, selNode);
if(index != -1)

continue with your code here


LVL 12

Expert Comment

ID: 19553958
the other possibility is that you are entering the for loop, in which case, the

 if (row.getForeignKey() == currRow.getPrimaryKey())

is returning false

so either that is the case, or you could try

row.getForeignKey().equals( currRow.getPrimaryKey())
LVL 12

Expert Comment

ID: 19553965
whichever case it might be, there is always a possiblity of the method returning a -1 (if the size is 0 or if the keys are unequal)

So you should check for the -1 case wherever you are calling the method

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