March 2007 - rules-users - Jboss List Archives

3.1M1 IDE compatible with Eclipse 3.2.2?

by S Reed

I have copied org.drools.ide_3.1.0.1.jar into my eclipse plugins directory and restarted eclipse. My drl files are not syntax colored, I do not see the JBoss Rules icon in the toolbar and I cannot find the JBoss Rules plugin listed under Help->About->Plugin Details. I haven't found any docs saying whether this should work or not. Please help me out. Scott

17 years, 1 month

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Error compiling rules (3.1M1). NoSuchMethodError: EclipseJavaCompiler.<init>(Ljava/util/Map; )V

by S Reed

I am upgrading from 3.0 to 3.1M1. Config: Win2k, Eclipse 3.2, JRE 1.5.0_09 I am getting the following error: Exception in thread "main" java.lang.NoSuchMethodError: org.apache.commons.jci.compilers.EclipseJavaCompiler.<init>(Ljava/util/Map;)V at org.drools.compiler.PackageBuilder.loadCompiler(PackageBuilder.java:615) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:123) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:94) at org.fp.findata.Rules.generateRuleBase(Rules.java:126) at org.fp.findata.Rules.addPackage(Rules.java:168) at org.fp.scenario.InitDB.initBasicRules(InitDB.java:505) at org.fp.scenario.InitDB.main(InitDB.java:58) I suspect I am missing one or more required jar files but can't figure out which. The library entries in my build path are: <classpathentry kind="lib" path="lib/antlr-2.7.6.jar"/> <classpathentry kind="lib" path="lib/antlr-3.0ea8.jar"/> <classpathentry kind="lib" path="lib/asm.jar"/> <classpathentry kind="lib" path="lib/cglib-2.1.3.jar"/> <classpathentry kind="lib" path="lib/commons-collections-3.1.jar"/> <classpathentry kind="lib" path="lib/commons-jci-core-1.0-406301.jar"/> <classpathentry kind="lib" path="lib/commons-jci-eclipse-3.2.0.666.jar"/> <classpathentry kind="lib" path="lib/commons-lang-2.1.jar"/> <classpathentry kind="lib" path="lib/commons-logging-1.0.4.jar"/> <classpathentry kind="lib" path="lib/converters.jar"/> <classpathentry kind="lib" path="lib/core-3.2.1.v_677_R32x.jar"/> <classpathentry kind="lib" path="lib/dom4j-1.6.1.jar"/> <classpathentry kind="lib" path="lib/drools-compiler-3.1.0-M1.jar"/> <classpathentry kind="lib" path="lib/drools-core-3.1.0-M1.jar"/> <classpathentry kind="lib" path="lib/fop.jar"/> <classpathentry kind="lib" path="lib/forms-1.0.7.jar"/> <classpathentry kind="lib" path="lib/hibernate3.jar"/> <classpathentry kind="lib" path="lib/hsqldb.jar"/> <classpathentry kind="lib" path="lib/jax-qname.jar"/> <classpathentry kind="lib" path="lib/jaxb-api.jar"/> <classpathentry kind="lib" path="lib/jaxb-impl.jar"/> <classpathentry kind="lib" path="lib/jaxb-libs.jar"/> <classpathentry kind="lib" path="lib/jfor-0.7.2rc1.jar"/> <classpathentry kind="lib" path="lib/jta.jar"/> <classpathentry kind="lib" path="lib/junit-3.8.1.jar"/> <classpathentry kind="lib" path="lib/log4j-1.2.11.jar"/> <classpathentry kind="lib" path="lib/logkit-20020529.jar"/> <classpathentry kind="lib" path="lib/namespace.jar"/> <classpathentry kind="lib" path="lib/relaxngDatatype.jar"/> <classpathentry kind="lib" path="lib/stringtemplate-2.3b6.jar"/> <classpathentry kind="lib" path="lib/velocity-1.4.jar"/> <classpathentry kind="lib" path="lib/velocity-dep-1.4.jar"/> <classpathentry kind="lib" path="lib/xercesImpl-2.6.2.jar"/> <classpathentry kind="lib" path="lib/xpp3-1.1.3.4.O.jar"/> <classpathentry kind="lib" path="lib/xsdlib.jar"/> <classpathentry kind="lib" path="lib/xstream-1.1.3.jar"/> Any help will be greatly appreciated. Scott

17 years, 1 month

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OR with multiple binding in LHS

by Francesco Campagnola

Hi, I'd like to write a rule that contains an OR condition in the LHS, to match the presence in the working memory of an object with particular values of a specific field. In the rest of LHS, i need to bind other values of the specific object matched. Is there a particular sintax to use for the binding? For example: rule "orCondition" when myObj : (MyObject(field1 == "a") or MyObject(field1 == "b")) //correct column field2: myObj.getField2() // how to correctly get field3: myObj.getField3() // those values? then System.out.println("fields = "+ field2 + field3); Thanks in advance, FC.

17 years, 1 month

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Error creating shadow fact for object

by dileep_sivaraman

I am using drools 3.1 MI I have got a class Message which contains an inner class ProcessRuleDTO When I try to assert the inner class object directly into memory it gives a shadow fact error. The Code Snippet : ProcessRuleDTO processRuleDTO=message.new ProcessRuleDTO(); workingMemory.assertObject( processRuleDTO ); Error : org.drools.RuntimeDroolsException: Error creating shadow fact for object: com..components.Message$ProcessRuleDTO@75e4fc at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:125) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:148) at org.drools.reteoo.Rete.assertObject(Rete.java:121) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:196) at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:68) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:724) at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:543) at Example.HelloWorldExample.main(HelloWorldExample.java:57) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at org.drools.base.ClassObjectType.getShadow(ClassObjectType.java:123) ... 7 more Caused by: java.lang.NoSuchMethodError: com.components.Message$ProcessRuleDTO: method <init>()V not found at com.components.Message$ProcessRuleDTOShadowProxy.<init>(Unknown Source) ... 12 more Can we or not assert an inner class directly in drools? Thanks -- View this message in context: http://www.nabble.com/Error-creating-shadow-fact-for-object-tf3400224.htm... Sent from the drools - user mailing list archive at Nabble.com.

17 years, 1 month

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SQL inside rules(new to rules )

by Arsene Costin

Can I use java helper classes (that connect to a database and retrive data) inside LHS and RHS in order to achive some business requirements. --------------------------------- Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.

17 years, 1 month

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dynamically generated classes, drools classloader, and jsr-94

by Martin Schoch

The application I'm working on will use facts which are dynamically generated classes. After reading http://jira.jboss.com/jira/browse/JBRULES-557 I figured out the trick to get this working was to pass the ClassLoader responsible for the dynamic classes to drools. So I set things up something like: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); PackageBuilder builder = new PackageBuilder(pbc); Using this approach I am able to execute rules which interact with the properties of the dynamically generated classes. The problem I've run into is that I'd really like to work with the JSR-94 API. I have two questions: 1. Is the code I referenced above using the correct approach? Or am I already headed down the wrong path? 2. Would passing additional configuration details into the properties argument of the call ruleExecutionSetProvider.createRuleExecutionSet(drlStream, properties) be advisable? I have created a proof of concept to test this and included a patch. Using this approach the application code looks something like this: PackageBuilderConfiguration pbc = new PackageBuilderConfiguration(); pbc.setCompiler(PackageBuilderConfiguration.JANINO); pbc.setClassLoader(instanceOfDynamicallyGeneratedClass.getClass().getCla ssLoader()); Map localProperties = new HashMap(); localProperties.put("packageBuilderConfiguration", pbc); RuleExecutionSet ruleExecutionSet = ruleExecutionSetProvider.createRuleExecutionSet(drlStream, localProperties); Obviously this introduces a JBossRules dependency into my application code, but I am otherwise able to stick to the JSR-94 APIs. I have attached a patch to support this new property and welcome comments on this solution. Thanks, Marty Schoch <mschoch(a)reisys.com>

17 years, 1 month

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can't refer to the bound column fields from the LHS?..

by Olenin, Vladimir (MOH)

Hi, I always assumed that one can refer to the properties of the bound column in the LHS like this: MyRecord { String field1, field2; } MyRecord2 { String field1, field3; } Rule xxx When $r1: MyRecord (field1 == "xxx") $r2: MyRecord2 (field1 == $r1.field1) Then System.out.println("found match: "+$r2+", "+$r1); End Compiler does complain on '$r1' usage in the LHS (as part of constraint for MyRecord2 fact), but works OK if used only in RHS. The error I'm getting is: "Unable to find class $r1". "$r1.getField1()" doesn't work either (getting "mismatched token, expecting ')' " error). Thanks, Vlad

17 years, 1 month

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Getting validation errors

by Mike Dougherty

Hello, I am using JBoss Rules to validate entities before storing them in the database. I therefore need a way to inform the calling code that the entity which was asserted failed verification. The only way I have been able to find that works is to assert an exception from within the rule file. For example: rule "user is 'miked'" when identity : Identity( username == "miked" ) then assertLogical(new IllegalStateException("Entity failed verification.")); end Then in the Java that fires the rule, I have: workingMemory.fireAllRules(); for(Iterator i = workingMemory.getObjects(Exception.class).iterator (); i.hasNext(); ) { System.out.println("Exception: "+i.next()); } Which seems to be working OK. But I wanted to see if maybe there is a better way to accomplish what I need. Thanks for you help. Mike -- ********************************* Mike Dougherty mjdougherty(a)gmail.com 858.232.3635 http://www.google.com/talk/ *********************************

17 years, 1 month

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[rule-users] OR with multiple binding in LHS

by Francesco Campagnola

Hi, I'd like to write a rule that contains an OR condition in the LHS, to match the presence in the working memory of an object with particular values of a specific field. In the rest of LHS, i need to bind other values of the specific object matched. Is there a particular sintax to use for the binding? For example: rule "orCondition" when myObj : (MyObject(field1 == "a") or MyObject(field1 == "b")) //correct column field2: myObj.getField2 () // how to correctly get field3: myObj.getField3() // those values? then System.out.println("fields = "+ field2 + field3); Thanks in advance, FC.

17 years, 1 month

1
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to retrieve objects from a list using "context"

by vanitha

hi i have to retrieve all the objects from a list. And i should also be able to use a list inside another list. can i do this using "context". is there any other way possible? -- View this message in context: http://www.nabble.com/to-retrieve-objects-from-a-list-using-%22context%22... Sent from the drools - user mailing list archive at Nabble.com.

17 years, 1 month

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rules-users March 2007