As MVEL functions can't be called directly from java, this doesn't work yet.

I did get MVEL functions to work from the drools-clips module, so there is some plumbing for this. We'd probably have to generate stab wrappers to get MVEL functions working in DRL itsef, so both java and mvel semantics can call it.

Mark
Michael Neale wrote: 
OK created this: https://jira.jboss.org/jira/browse/JBRULES-2298

On Tue, Oct 13, 2009 at 9:38 AM, Michael Neale <michael.neale@gmail.com> wrote:
  
Hi Steve - yes that seems to work - hence why I have not noticed it
before. I wonder with 4.0.x if it was actually using MVEL for the
function body, or flipping back to the java dialect (which is what
happens when you put it in a different DRL now).

On Tue, Oct 13, 2009 at 1:24 AM, Steve Ronderos <steve.ronderos@ni.com> wrote:
    
Hi Michael,

We are experiencing the same issue.  We have had to put our functions in a
different .drl to get around this for now.  If it helps any, this was
working ok in version 4.0.7, and broke when we went to 5.0.1.

Thanks,

Steve Ronderos

rules-dev-bounces@lists.jboss.org wrote on 10/11/2009 11:52:04 PM:

      
[image removed]

[rules-dev] MVEL in functions?

Michael Neale

to:

Rules Dev List

10/11/2009 11:53 PM

Sent by:

rules-dev-bounces@lists.jboss.org

Please respond to Rules Dev List

Hey is mvel in functions broken? I have a distant memory of something
along these lines. I was just trying something like:

package jboss.cloud

dialect "mvel"


#trying to get functions working...
rule "something"
    when
        s: SimpleFact(id == 42, name == "michael")
    then
        System.out.println("hello");
end

function String doSomething() {
 return "hey";
}

And I get:

java.lang.NullPointerException
   at org.drools.rule.builder.dialect.mvel.MVELDialect.compile
(MVELDialect.java:510)
   at org.drools.rule.builder.dialect.mvel.MVELDialect.addFunction
(MVELDialect.java:338)
   at
org.drools.compiler.PackageBuilder.addFunction(PackageBuilder.java:1104)
   at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:626)
   at org.drools.compiler.PackageBuilder.addPackageFromDrl
(PackageBuilder.java:290)
   at org.drools.compiler.PackageBuilder.addKnowledgeResource
(PackageBuilder.java:488)
   at org.drools.builder.impl.KnowledgeBuilderImpl.add
(KnowledgeBuilderImpl.java:25)

(haven't tried trunk) - anyone else seen this?
removing the dialect "mvel" at the package level at it is fine.





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Michael D Neale
home: www.michaelneale.net
blog: michaelneale.blogspot.com
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Michael D Neale
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blog: michaelneale.blogspot.com