2011/5/28 Edson Tirelli <ed.tirelli@gmail.com>

   Wolfgang,

   I think Davide's implementation supports extending existing java classes... did you tried? What is not possible is to implement interfaces, since you can't define methods in the declare statement.

   Edson

2011/5/28 Wolfgang Laun <wolfgang.laun@gmail.com>

There is, since 5.2.0, the option of extending a class declared in DRL:

declare A
   i : int
end

declare B extends A
...
end

Any class origninating from Java code cannot be extended in DRL.

-W

On 28 May 2011 10:56, Tomas Olsson <tol@sics.se> wrote:
Hi,
I have tried to look this up but cannot find any clear answer on the web.
Does drools support extension of existing classes for new type declarations?
That would be very nice if this would be possible.

/Tomas
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Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com

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