[image removed] [rules-dev] MVEL in functions? Michael Neale to: Rules Dev List 10/11/2009 11:53 PM Sent by: rules-dev-bounces(a)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

at

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 _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

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(a)ni.com&gt; 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(a)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(a)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 >> _______________________________________________ >> rules-dev mailing list >> rules-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-dev > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > > -- Michael D Neale home: www.michaelneale.net blog: michaelneale.blogspot.com

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(a)gmail.com&gt; 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(a)ni.com&gt; 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(a)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(a)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 _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev -- Michael D Neale home: www.michaelneale.net blog: michaelneale.blogspot.com _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

Hi guys,     Sorry for posting this problem here again, but I've been searching up and down for solutions and the only solution I found online doesn't work for me.     So my problem is when I tried to integrate drools into my application which is using jboss 4.05GA, I got the following error after I added the eclipse JDT core jar to the classpath. java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/eclipse/jdt/core/compiler/IProblem;  at org.apache.jasper.compiler.JDTCompiler$2.acceptResult(JDTCompiler.java:345) I tried the solution on http://www.jboss.org/community/wiki/RulesTomcat --> I set -Ddrools.compiler=JANINO in my jboss server startup script, changed my java code to use JANINO dialect, but I am still getting the same error, and if I remove the JDT core jar, I get org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.dro ols.rule.builder.dialect.java.JavaDialectConfiguration'^M         at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)^M People's mentioning that the solution worked, so am I missing something here? Thanks a lot! _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

Thanks Michael,          But my rule is really simple, it's something like this: if type ==1 then system.out.println(); ----- Original Message ---- From: Michael Neale <michael.neale(a)gmail.com&gt; To: Rules Dev List <rules-dev(a)lists.jboss.org&gt; Sent: Sat, October 17, 2009 5:57:10 PM Subject: Re: [rules-dev] jboss 4.05GA and drools 5.1.0M1? you don't have to set the dialect in the rules - you just make sure the RHS of rules don't use any java 5 generics and it should work. On Sat, Oct 17, 2009 at 11:27 AM, Jane James <jane6210(a)yahoo.com&gt; wrote: > Hi guys, >     Sorry for posting this problem here again, but I've been searching up > and down for solutions and the only solution I found online doesn't work for > me. >     So my problem is when I tried to integrate drools into my application > which is using jboss 4.05GA, I got the following error after I added the > eclipse JDT core jar to the classpath. > > java.lang.NoSuchMethodError: > org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/eclipse/jdt/core/compiler/IProblem; >  at > org.apache.jasper.compiler.JDTCompiler$2.acceptResult(JDTCompiler.java:345) > > > I tried the solution on http://www.jboss.org/community/wiki/RulesTomcat --> > I set -Ddrools.compiler=JANINO in my jboss server startup script, changed my > java code to use JANINO dialect, but I am still getting the same error, and > if I remove the JDT core jar, I get > > org.drools.RuntimeDroolsException: Unable to load dialect > 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.dro > > ols.rule.builder.dialect.java.JavaDialectConfiguration'^M > >         at > org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)^M > > People's mentioning that the solution worked, so am I missing something > here? > > Thanks a lot! > > > > > > > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > > -- Michael D Neale home: www.michaelneale.net blog: michaelneale.blogspot.com _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev