🚀 go-pugleaf

Wolf wrote:

>>Wolf wrote:
>>
>>
>>>Hi,
>>>
>>>I want to make several classes write messages to a JTextPane which has been created by one of them. I tried to save a reference to the pane in a class which controlls the user interface; later on I want to use this reference to write to the TextPane:
>>>
>>>JTextPane TextPane = new JTextPane();
>>>uic.setTextPane(TextPane);
>>>
>>>When setting TextPane to the uic slot I get a java.lang.NullPointerException
>>>
>>>What am I doing wrong?
>>>
>>>Regards
>>>
>>>Wolf
>>

> 
>  Lori,
>  
>  my idea was (and maybe I'm compleately wrong)
>  to store a reference to an existing TextPane
>  'somewhere', to make it accessable to diferent
>  clases. My controller has the following methods
>  for 'storing' and 'retrieving' the reference,
>  but even the 'set' produces the mentioned error.
>  Here follows the code for both methods.
>  
>  
>  public class UIController {
>  
>  ....
>  
>   public void setTextPane(JTextPane pane) {
>     TextPane = pane;
>   }
> 
>   public JTextPane getTextPane() {
>     return TextPane;
>   }
>   
>   ....
>   }
>   
>   Similar code works for passing around references
>   of, for example, trees, treenodes and treemodels.
>   I dont understand why it does'nt work with panes.
>   Is it posible that the pane is not really initialized 
>   till put into a type of container?
>   
>   Regards, Wolf
> 

Have you compiled using debug?  What line exactly is the NPE occurring 
on?  The only thing I can see is if your uic member is not yet 
initialized, you could get an NPE.

-- 

Regards,

Lori Olson [TeamB]