Same problem here but in a Rule containing an accumulate:

  1. rule "fromAccumulateRule"
  2.         dialect "mvel"
  3.         when
  4.                 fc : Car( ) from accumulate ( Car( b : brand)
  5.                         init( Car c= new Car(); ),
  6.                         action( c.brand = c.brand + b; ),
  7.                         result( c )
  8. )
  9.         then
  10.                 insert (fc);
  11. end


The error is the same:

  1. Caused by: org.drools.RuntimeDroolsException: [Error: unable to access property (null parent): b]
  2. [Near : {... Unknown ....}]
A full stacktrace is available here: http://drools.pastebin.com/f1638db0e


Best,

On Tue, Jan 26, 2010 at 10:24 PM, Barry Kaplan <groups1@memelet.com> wrote:

Ok, I see from previous posts that we are having mvel issues. Cool.
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Esteban Aliverti