org.mvel.CompileException: can not resolve identifier: 'declr'

org.mvel.CompileException: can not resolve identifier: 'declr'
 at org.mvel.ASTNode.getReducedValue(ASTNode.java:315)
 at org.mvel.ast.PropertyASTNode.getReducedValue(PropertyASTNode.java:29)
 at org.mvel.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:103)
 at org.mvel.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:51)
 at org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:428)
 at org.mvel.TemplateInterpreter.parse(TemplateInterpreter.java:320)
 at org.drools.rule.builder.dialect.java.AbstractJavaBuilder.generatTemplates(AbstractJavaBuilder.java:113)
 at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:95)
 at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)
 at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)
 at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)
 at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)
 at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:63)
 at com.sample.DecisionTableTest.main(DecisionTableTest.java:36)

替换mvel.jar为mvel14-1.2.10.jar后不再报错，好像是jar包的问题。
看了下jar包里面的org.mvel.ASTNode.getReducedValue方法已经注释掉了。