Hi all! I'm writing a rule that contains the following statement: $agreementOffer:AgreementOffer($logicalFixedNumber:configurationParameters["6410"]) This results of this is not surprisingly that both $agreementOffer and $logicalFixedNumber get assigned a value. Instead of using the "magic value" 6410, I want to use ParameterId constant class, which implements the toString() to return the value. I have tried several different ways to refer to the constant but without luck. The errors says: Unable to create Field Extractor for 'configurationParameters[ParameterId.LOGICAL_NUMBER_FIXED] I have also tried to extract the value of the ParameterId.LOGICAL_NUMBER_FIXED into a local variable, which I can see prints the correct value, but the error says the same: Unable to create Field Extractor for 'configurationParameters[$logicalNumberFixedConstant] Do anyone understand what is happening here and what I do wrong? I'm are still on the JKD 1.4, and uses MVEL 1.3 Thanks, @ndré -- View this message in context: http://n3.nabble.com/Trouble-using-constants-to-access-Maps-tp178720p1787... Sent from the Drools - Dev mailing list archive at Nabble.com. _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

Hi Edison, and thanks for the quick response. The manifest file says 1.3.1 May 6 2008 I also see that there exists a 1.3.16 December 29 2008, but I get an other error when I replaces my original jar with this one. java.lang.NoSuchMethodError: org.mvel.MVEL.setThreadSafe(Z)V at org.drools.rule.builder.dialect.mvel.MVELDialect.init(MVELDialect.java:144) at org.drools.compiler.DialectRegistry.initAll(DialectRegistry.java:49) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:146) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:108) at com.telenor.cos.domain.rules.RuleCompiler.init$_aroundBody2(RuleCompiler.java:83) at com.telenor.cos.domain.rules.RuleCompiler.init$_aroundBody3$advice(RuleCompiler.java:202) at com.telenor.cos.domain.rules.RuleCompiler.compileAndAddRuleTemplate(RuleCompiler.java:83) at com.telenor.cos.domain.rules.RuleCompiler.compileAndAdd(RuleCompiler.java:51) at com.telenor.cos.domain.rules.COSRulesTestCaseBase.executeRule(COSRulesTestCaseBase.java:284) I guess I have to update some other jar's as well. @ndré -- View this message in context: http://n3.nabble.com/Trouble-using-constants-to-access-Maps-tp178720p1787... Sent from the Drools - Dev mailing list archive at Nabble.com. _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev

I tried version the MVEL version from 1.3.9 to 1.3.12, but I can still not make use of the constant class. Above MVEL 1.3.12 I get the lang.NoSuchMethodError: org.mvel.MVEL.setThreadSafe(Z)V The error message I receive now is different from the original one. Refering directly to the "constant" like this: AgreementOffer($logicalFixedNumber:configurationParameters[ParameterId.LOGICAL_NUMBER_FIXED.stringValue]) produces this error, org.mvel.CompileException: unable to resolve property: unable to resolve token: ParameterId.LOGICAL_NUMBER_FIXED.stringValue and when first assigns the value to a variable: $xx:String(this != null) from ParameterId.LOGICAL_NUMBER_FIXED.stringValue AgreementOffer($logicalFixedNumber:configurationParameters[$xx]) produces a similar error: org.mvel.CompileException: unable to resolve property: $xx @ndré