[rules-users] Drools Guvnor Issues : Default Constructors & Declaring Dialects

[Toni Rikkola]

Guvnor sets the default dialect to MVEL, so to use Java you need to 
reset it like you did.

Toni Rikkola

Esteban Aliverti wrote:
> Hi,
>
> I think that the non-args constructor is required because the classes 
> are instantiated using reflection: Class.forName("...").newInstance();
>
> Best,
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Developer @ http://www.plugtree.com <http://www.plugtree.com>
> - Blog @ http://ilesteban.wordpress.com
>
>
> On Tue, Jul 13, 2010 at 9:01 PM, soc.frangis <soc.frangis at gmail.com 
> <mailto:soc.frangis at gmail.com>> wrote:
>
>
>     I have successfully converted a previous rules engine project to
>     Drools and
>     was attempting to make the next step by trying out Guvnor for the
>     QA/Testing
>     module.
>
>     1)Even though my program executed and ran perfectly in Eclipse, i
>     noticed
>     the testing QA section of Guvnor would crash with my fact models
>     because i
>     did not have a default constructor with no arguments. I made the
>     change, but
>     is this something that is required for Guvnor QA to work properly
>     (all fact
>     models / POJOs MUST have a default no-arg constructor) OR did i just
>     configure Guvnor wrong?
>
>     I basically solved my problem, just trying to learn why there was
>     a problem
>     to begin with.
>
>     2) Also, I noticed that even though the default dialect is java
>     (and not
>     specifying it does not cause any issues in Eclipse), the Guvnor QA
>     section
>     would not understand the rules unless they explicitly have dialect
>     "java" in
>     their signature. Of course adding it fixes the problem, but again I am
>     trying to learn why. I assumed since it is the default dialect
>     that it would
>     not need to be stated.  Is this again just the way Guvnor works
>     (doesn't
>     work) or do i need to configure it a certain way?
>     --
>     View this message in context:
>     http://drools-java-rules-engine.46999.n3.nabble.com/Drools-Guvnor-Issues-Default-Constructors-Declaring-Dialects-tp965078p965078.html
>     Sent from the Drools - User mailing list archive at Nabble.com.
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