Problems trying to get simple tRules implementation working

Anonymous — Sat, 16 Nov 2024 12:45:06 GMT

Hi
I am looking at what is involved in using the tRules component and I am getting run time errors.
I created the rule in Guvnor (not the one integrated into TAC) and added it to the meta data section of Talend under the Embeded Rules following the steps in the User Guide. The rule looks like this.

package Account
import dave.test.Account
rule "loan_OK"
	dialect "mvel"
	when
		Account( age > "18" )
	then
		Account fact0 = new Account();
		fact0.setCurrent_Ballance( 1000 );
		insert(fact0 );
end

The error I get is

^

at org.mvel2.compiler.AbstractParser.procTypedNode(AbstractParser.java:1278)
at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:712)
at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:106)
at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:55)
at org.drools.rule.builder.dialect.mvel.MVELExprAnalyzer.analyzeExpression(MVELExprAnalyzer.java:86)
at org.drools.rule.builder.dialect.mvel.MVELDialect.analyzeBlock(MVELDialect.java:492)
at org.drools.rule.builder.dialect.mvel.MVELConsequenceBuilder.build(MVELConsequenceBuilder.java:84)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
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)
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBaseDRL(Rules.java:991)
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBase(Rules.java:980)
at dev.rules_0_1.Rules.tRowGenerator_1Process(Rules.java:1044)
at dev.rules_0_1.Rules.runJobInTOS(Rules.java:3919)
at dev.rules_0_1.Rules.main(Rules.java:3726)
Unable to resolve ObjectType 'Account' :
Unable to build expression for 'consequence': unknown class or illegal statement: Account 'Account fact0 = new Account();
fact0.setCurrent_Ballance( 1000 );
insert(fact0 );
' :
Error importing : 'dave.test.Account'
Exception in component tRules_2
java.lang.IllegalArgumentException: Could not parse knowledge.
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBaseDRL(Rules.java:1000)
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBase(Rules.java:980)
at dev.rules_0_1.Rules.tRowGenerator_1Process(Rules.java:1044)
at dev.rules_0_1.Rules.runJobInTOS(Rules.java:3919)
at dev.rules_0_1.Rules.main(Rules.java:3726)

I simplified the rule by hand in Talend to

package Account
import dave.test.Account
rule "loan_OK"
	dialect "mvel"
	when
		Account( age > "18" )
	then
		System.out.println("Customer is full age");
end

I then get the error

Unable to resolve ObjectType 'Account' :
Error importing : 'dave.test.Account'
Exception in component tRules_2
java.lang.IllegalArgumentException: Could not parse knowledge.
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBaseDRL(Rules.java:1000)
at dev.rules_0_1.Rules$1KnowledgeBase_tRules_2.readKnowledgeBase(Rules.java:980)
at dev.rules_0_1.Rules.tRowGenerator_1Process(Rules.java:1044)
at dev.rules_0_1.Rules.runJobInTOS(Rules.java:3919)
at dev.rules_0_1.Rules.main(Rules.java:3726)

It looks like it can not find the imported class Account, Have I missed somthing when setting up the rule?
Many thanks in advance Dave

Re: Problems trying to get simple tRules implementation working

Anonymous — Tue, 09 Aug 2011 21:00:58 GMT

Hi
I added a tLibraryLoad component to load the jar with the class in it and it stopped the error "importing dave.test.Account" error. But I now get the following error.

Exception in component tRules_1
java.lang.RuntimeException: Unexpected global

Any ideas where to look next?
Many thanks Dave

topic Problems trying to get simple tRules implementation working in Talend Studio

Problems trying to get simple tRules implementation working

Re: Problems trying to get simple tRules implementation working