[rules-users] shadow proxy nullpointerexception

[Edson Tirelli]

   Assuming your "computesomething" method has a signature like:

public boolean computesomething() { .. }

   The shadow proxy will delegate the call to your instance method. So, does
not matter if the shadow proxy innerObj is null (since being a lazy proxy it
may not have been loaded yet) because the shadow proxy will actually execute
your instance computesomething() method.

   Stack trace?

   []s
   Edson

2008/12/9 Trägenap <traegenap at ttc-informatik.de>

> Hello,
>
> I got some problems with shadowproxy.
>
> I have a couple of instances of class "FirstObj". The objects contains some
> other objects like "innerObj" and have a method "computesomething", which
> returns boolean and use the "innerObj" to compute the result.
>
> I try to access this object with the following rule:
>
> rule "doIt"
> when
>    $firstobj : FirstObj(computesomething == true)
> then
>    // take a break...
>    System.out.println("be happy");
>
> I debug the programm and figure out that the innerObj is not null. Instead
> of my original object "firstobj", there I found a FirstObjShadowProxy which
> offers a field called "innerObj" which is null.
>
> Isnt it possible to get access to "computed" fields? What is wrong here?
>
> Thanks
> Thorsten
>
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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