[rules-dev] MVEL in functions?

[Michael Neale]

oh ok - so its not really broken - but perhaps in the past it used
java dialect for functions even in the same DRL...

On Tue, Oct 13, 2009 at 9:55 AM, Mark Proctor <mproctor at codehaus.org> wrote:
> 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 at 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 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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>
>
> --
> Michael D Neale
> home: www.michaelneale.net
> blog: michaelneale.blogspot.com
>
>
>
>
>
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>



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