jsf - getselectednode from another bean (primefaces) -

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I have a managed node of nick and other managed bean, where I would like to get from selectNode and getType execute some code But the problem is that I can not get the reason for the selected node every time: 

  java.lang.NullPointerException: javax.faces.FacesException: # {dimMan.makeDim ()} : Java.lang.NullPointerException   
 And this is my two managed wing:  
  @ManagedBean @ViewScoped public class TreeBean applies Serializable {Personal Static Final L Sector serial VERSIONUID = 2417620239014385855 L; Private triode route; Private triode selected node; .....   
 And secondly, where I would like to test the type of selected node:  
  @ManagedBean (name = "hotman") @ Session-scocked public square DimenssionManaged {@EJB DimensionDaoRemote dimService; @Internet TreeBean Tree selected; Select string; Receive public trebrainTree selected () {Return tree selected; } Selected public zero set (selected tree tree) {this.tree selection = tree selected; } Public Zero MakeDIM () {System.out.println ("Adding"); Fkey = tTable.getSelectedFk (); DimUpdate.setFk_dimension (fkey); DimUpdate.setType_dimension (selectedType); Selection = treeSelected.getSelectedNode () getParent () GetType () .. Println (selection); If (choose == "cube") {CubeBase cub = cubManged.getCubUpdate (); DimUpdate.setCube (cubs); DimService.creat_dimension (dimUpdate); } Else {schemabass sh = shmanged.getSchema (); DimUpdate.setSchema (sh); DimService.creat_dimension (dimUpdate); }}   
 I also try to use this annotation  @ManagedProperty (value = ***) , but it was not working so What should I do with other managed types of selected node type << p> 
? If this happens then once you  tribhen  has changed its data into its code, it will be removed from  @ViewScoped .  
 Change the  tribbeen  to  @SessionSocked  to keep the data even after navigation, but refresh the data / refresh the concern subject to.

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