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https://issues.apache.org/jira/browse/WICKET-2888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Ertl resolved WICKET-2888.
--------------------------------
Assignee: Peter Ertl
Fix Version/s: 1.4.13
1.5-M3
Resolution: Fixed
Integrated in current 1.4.x and 1.5.x. Please verify thoroughly ! :-)
> Nullpointer when inserting [i.e. moving] a node in a TreeTable (AbstactTree,
> treeNodesInserted)
> -----------------------------------------------------------------------------------------------
>
> Key: WICKET-2888
> URL: https://issues.apache.org/jira/browse/WICKET-2888
> Project: Wicket
> Issue Type: Bug
> Components: wicket, wicket-extensions
> Affects Versions: 1.4.2
> Environment: On Linux, AMD64
> Reporter: Rob Audenaerde
> Assignee: Peter Ertl
> Fix For: 1.4.13, 1.5-M3
>
> Attachments: patch.txt, patch.txt, patch.txt, tree-quickstart.tar.gz
>
>
> A have a simple tree:
> root
> -c1
> --cc1
> -c2
> --cc2
> -c3
> I want to move c3 from parent root to parent c2. This works when the treenode
> c2 is not expanded, i.e. cc2 is not shown. When c2 is expanded, the action
> results in a nullPointerException in treeNodesInserted. The cause of the
> nullPointer is:
> parentItem.getChildren() <-- returns null, but in line 845 the
> parentItem.getChildren().add() is called, thus the nullPointer.
> Any hints?
> my piece of tree manipulation code:
> table.getTreeTable().modelChanging();
> DefaultTreeModel model = (DefaultTreeModel)
> table.getTreeTable().getDefaultModelObject();
> DefaultMutableTreeNode parent = (DefaultMutableTreeNode)
> myNode.getParent();
> // getIndexOfChild returns -1 if either of th nodes == null
> int myIndex = model.getIndexOfChild( parent, myNode );
> if ( myIndex < 1 ) // 0 or -1
> {
> return;
> }
> DefaultMutableTreeNode previousSibling =
> (DefaultMutableTreeNode) model.getChild( parent, myIndex - 1 );
> model.removeNodeFromParent( myNode );
> //insert the node as last
> model.insertNodeInto( myNode, previousSibling,
> model.getChildCount( previousSibling ) );
> table.getTreeTable().modelChanged();
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