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

[Zeke]

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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