There’s another way…..

In the Eclipse Plugin Preferences (Eclipse -> Preferences -> Drools -> Installed Drools Runtime) you point to the location of the Drools runtime you want to use.  If you swap out the MVEL file at the location of your Drools Runtime it should pick up the right version of the MVEL.

You could also duplicate the jar files in that folder into a “Patch” folder, replace the MVEL jar in the PATCH copy, and setup a “Patch Drools Runtime” if you want to keep your original installation pristine.

You will likely need/want to bounce Eclipse for this to take effect.

---

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Thursday, August 20, 2009 12:12 PM
To: Rules Users List
Subject: Re: [rules-users] Drools library - updating Drools jar

   Does not matter the order in the "libraries" tab. You need to set them in the "Order and Export" tab.

   []s
   Edson

2009/8/20 KDR <dr.soprano@neverbox.com>

Edson thank you very much for your suggestions.

I wonder if it didn't work because I used 2.0.13? - I did that because I
couldn't find 2.0.12 on the download page at
http://docs.codehaus.org/display/MVEL/Downloading+MVEL - as you can see from
the attached pic I did try adding that jar to the project build path, ahead
of the "standard" Drools library.

I'll download 2.0.14-SNAPSHOT and try it with that. Don't have the strength
to rebuild etc right now! I'll report back. Thanks again for your help, much
appreciated. :)

http://www.nabble.com/file/p25063132/drools3.png drools3.png

Edson Tirelli-3 wrote:
>
>    I am no Eclipse expert, but:
>
> "The correct way" (TM): checkout the source code, change the pom.xml to
> use
> the correct MVEL version, rebuild the plugin and re-install. When we
> release
> the next version, just update it.
>
> "The easy way" (TM): add the new mvel jar to your eclipse project
> classpath
> and move it up to be before the drools library in the eclipse project
> classpath order. You will have both in the classpath, but being first in
> the
> classpath order will make eclipse use it.
>
>    You must use 2.0.12 or 2.0.14-SNAPSHOT. When I tested 2.0.13 there was
> a
> regression, if I remember correctly.
>
>    []s
>    Edson
>

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