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Sometimes a developer asks you to make a J2EE server node debug able. To do this, launch the J2EE Config Tool (usr/sap//instance/j2ee/configtool) . Then click on server instance node and in the right pane navigate to the Servers Debug tab. There you must select the Debuggable tick box as well as the Enable Debug Mode tick below it.See the screen shot below.

from http://netweaverstuff.blogspot.com/2007/11/enable-debug-mode-in-j2ee-server-node.html

    Zds0001_Save_Input ds0001SaveInput = new Zds0001_Save_Input();
    wdContext.nodeZds0001_Save_Input().bind(ds0001SaveInput);
   
    IDS0001QueryBankHeadNode queryBankHeadNode = wdContext.nodeDS0001QueryBankHead();
   
    try {   
        for (int i = 0; i < queryBankHeadNode.size(); i++) {
            queryBankHeadNode.setLeadSelection(i);
            Zbank_Head bankHead = new Zbank_Head();
            WDCopyService.copyCorresponding(queryBankHeadNode.currentDS0001QueryBankHeadElement(), bankHead);
            ds0001SaveInput.addIt_Bank_Head(bankHead);           
        }
       
        wdContext.currentZds0001_Save_InputElement().modelObject().execute();
        wdContext.nodeDS0001SaveOutput().invalidate();
    } catch (Exception e) {
        reportException(method, e);
    } finally {
        wdContext.currentZds0001_Save_InputElement().modelObject().modelInstance().disconnectIfAlive();
    }

IWDNode.invalidate() 不生效？用这个吧：

  //@@begin javadoc:deleteElements()
  /** Declared method. */
  //@@end
  public void deleteElements( com.sap.tc.webdynpro.progmodel.api.IWDNode node )
  {
    //@@begin deleteElements()
    for (int i = node.size() - 1; i >= 0; --i)
        node.removeElement(node.getElementAt(i));
    //@@end
  }