[rules-users] Why are MVEL rules compiled on first access?

[Edson Tirelli]

   Sobhana,

   This is very important feedback. Would you be able to create an isolated
test case showing this problem? This would be the quickest way for us to fix
it.

   On a related note, everything should be compiled at compile time,
including MVEL stuff. If that is not happening, we need to check what mvel
is doing internally.

   Thanks,
      Edson

2009/6/4 Sobhana <sobhanarich at yahoo.com>

>
> hi,
>
> Our application uses Drools 4.0.7 and Hibernate 3.x. We use the BRMS to
> compile the rules from drl files (using java dialect) into rule packages
> which are updated into the rule base using the rule agent.
>
> We have seen that MVEL rules are compiled when the rules are fired for the
> first time. If the fact passed at the first run contains a Hibernate proxy
> (subclass of the original object) and we later re-use the compiled rule on
> the fact containing the original object, we get a ClassCastException.
> However, if we pass the fact containing the original object in the first
> run, there is no problem for further runs.
>
> Why are the rules not compiled when we create the package using the BRMS?
> How can we enable precompilation so that the type is taken as the original
> object itself?
>
> Thanks,
> Sobhana
>
> --
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>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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