Re: missing proxy for a Window

Very briefly - the proxy can only be set once we have parsed the  
document; however, at time the javascript needs to access the window  
object before this has happened. To handle this, we allow the creation  
of the window object early, and set its proxy once we have it.


On Mar 28, 2008, at 7:40 AM, Wolfgang Fahl wrote:

> This is probably a question for Russel,
>
> while debugging the new Javascript dom implementation i traced down  
> a problem to a null pointer exception and then made the error  
> message more readable like this:
> Caused by: java.lang.RuntimeException : DomWindow.open failed for  
> 'target' _proxy is null
>       at com.meterware.httpunit.dom.DomWindow.open( DomWindow.java: 
> 87 )
>       at sun.reflect.NativeMethodAccessorImpl.invoke0( Native Method )
>       at  
> sun 
> .reflect 
> .NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39 )
>       at  
> sun 
> .reflect 
> .DelegatingMethodAccessorImpl 
> .invoke( DelegatingMethodAccessorImpl.java:25 )
>       at java.lang.reflect.Method.invoke( Method.java:585 )
>       at org.mozilla.javascript.MemberBox.invoke( MemberBox.java:145 )
>       ... 55 more
>
> The cause seems to be the constructor which does not set a proxy:
>     /**
>      *   construct   me   from   a   document
>      *   @param   document
>      */
>     public  DomWindow( HTMLDocumentImpl document ) {
>         _document  = document;
>     }
> all other constructors do.
> The constructor is called from:
>     /**
>      *   get   the   Window
>      *   @return   the   window
>      */
>     public  DomWindow getWindow () {
>     // if there is now window yet
>       if  ( _window  == null ) {
>           // create a window for this document
>          _window  = new  DomWindow( this  );
>         setParentScope( _window  );
>       }
>       return   _window ;
>     }
> This is the only line where I could find a setProxy - which is in  
> WebResponse.getReceivedPage
>                 ((HTMLDocumentImpl)  
> _page .getRootNode()).getWindow(). setProxy ( this  );
> How should the proxy be correctly set here?
>
> Yours
>   Wolfgang
>
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