[rules-dev] MVEL in functions?

[Michael Neale]

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