problem regarding webdynpro application

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Hi,

I am narendra. I am facing problem when i was exceuting sample webdynpro

application (construting a Recursive and loadable webdynpro tree).

It shows that java.lang.NullPointerException is occured when i click the tree nodes.

There is a parameter mapping in this application which can map the tree node elements selected at run time with the action event parameters.

I think that the node which we select at runtime must not be able to passing to the action event parameters.

Here I am giving code of parameter mapping which might be leads to the problem.

public static void wdDoModifyView(IPrivateTreeView wdThis, IPrivateTreeView.IContextNode wdContext, com.sap.tc.webdynpro.progmodel.api.IWDView view, boolean firstTime)

{

//@@begin wdDoModifyView

if (firstTime) {

IWDTreeNodeType treeNode =

(IWDTreeNodeType) view.getElement("TheNode");

/* parameter mapping from parameter "path" to

parameter "selectedElement"

*/

treeNode.mappingOfOnAction().addSourceMapping(

"path",

"selectedElement");

/* parameter mapping from parameter "path" to

parameter "element".

*/

treeNode.mappingOfOnLoadChildren().addSourceMapping(

"path",

"element");

}

//@@end

}

can anyone help me?

Thanks in advance,

Narendra.M