Nullpointer when inserting a node in a TreeTable (AbstactTree,
treeNodesInserted)
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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: [email protected]
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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