[rules-users] meet Operator 'Operator = 'contains'' does not exist for StringEvaluator error

Friday, 16 January 2009

Hi, all:
    I meet a strange error when use "contains" operator on string type, My
rule is like below:

...
 package org.drools.examples;

 import org.drools.examples.HelloWorldExample.Message;

 rule "check str contains"
     dialect "java"
     when
         m:Message( message contains "Hello" )
     then
         System.out.println( "===check str contains ok===" );
 end 
It throw below exception:

...
  Exception in thread "main" java.lang.RuntimeException:
Operator 'Operator
 = 'contains'' does not exist for StringEvaluator
     at
 org.drools.base.evaluators.StringFactory.getEvaluator(StringFactory.java:70)
     at org.drools.base.ValueType.getEvaluator(ValueType.java:166)
     at
 org.drools.rule.builder.PatternBuilder.getEvaluator(PatternBuilder.java:900)
     at
 org.drools.rule.builder.PatternBuilder.buildRestriction(PatternBuilder.java:714)
     at
 org.drools.rule.builder.PatternBuilder.buildRestriction(PatternBuilder.java:625)
     at
 org.drools.rule.builder.PatternBuilder.createRestriction(PatternBuilder.java:434)
     at
 org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:308)
     at
 org.drools.rule.builder.PatternBuilder.buildConstraint(PatternBuilder.java:199)
     at
 org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:168)
     at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:93)
     at
 org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:69)
     at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:53)
     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
 org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:28)
 But if I use a "deep" str field, this issue does not exist, Everything
goes
well.
The drl is like below:

...
 package org.drools.examples;

 import org.drools.examples.HelloWorldExample.Message;

 rule "check deep str contains"
     dialect "java"
     when
         m:Message( sec.fir.msg contains "Hello" )
     then
         System.out.println( "===check deep str contains ok===" );
 end 
It seems a bug, but I am not sure. I attached my test code and the two drl
files.
I use below jars to compile and run this test case:

...
 antlr-runtime-3.0.jar
 core-3.2.3.v_686_R32x.jar
 drools-compiler-4.0.7.jar
 drools-core-4.0.7.jar
 drools-decisiontables-4.0.7.jar
 drools-jsr94-4.0.7.jar
 janino-2.5.10.jar
 jsr94-1.1.jar
 mvel-1.3.12-java1.4.2.jar 
 Can everyone kindly give me any suggestion?

Thanks!
- Zeke

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[rules-users] meet Operator 'Operator = 'contains'' does not exist for StringEvaluator error