[rules-users] Nullpointer inserting fact.

[psyduck]

Hey,

I ve got a class
WebService{
          getter/setter for invoke property
}

then i got the following rules

rule "..."
salience 10
when
        $web : WebService ( )
then
       Invoke inv = new invoke();
       $web.setInvoke(inv);
       insert(inv);
end
this succeeds,but then the following rule : 
rule "..."
salience 9
when 
       $inv : Invoke( )
       $web : WebService ( invoke == $inv);
then
...
end

never gets executed,because he doesnt find a webservice with same invoke,
(according to debug information,they are the same invoke object)

Is it possible that this happens because when i inserted the webservice in
the workingmemory, the invoke
property was not yet defined(=null)?
Does anyone know a solution for this? 
Thx in advance
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