[jboss-jira] [JBoss JIRA] Created: (JBRULES-2871) KnowledgeAgent: unable to determine operator for symbol [after]

[Oscar de Groot (JIRA)]

KnowledgeAgent: unable to determine operator for symbol [after]
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                 Key: JBRULES-2871
                 URL: https://issues.jboss.org/browse/JBRULES-2871
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 5.1.1.FINAL
            Reporter: Oscar de Groot
            Assignee: Mark Proctor


When loading a ruleset via a KnowledgeAgent, only the operators defined in org.drools.base.evaluators.Operator (== != >= < <= <) are supported. When loading the same rulebase via a KnowledgeBuilder, all operators are supported.

Upon loading a ruleset that contains another operator (e.g. "after", "before"), the following error is printed:

[2011:01:19 14:01:44:exception]
java.lang.RuntimeException: KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage  
	at org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:674)
	at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:899)
...
Caused by: org.drools.RuntimeDroolsException: unable to determine operator for symbol [after]
	at org.drools.base.evaluators.Operator.determineOperator(Operator.java:87)
	at org.drools.base.evaluators.Operator.readResolve(Operator.java:122)

Using Eclipse's debugging feature, I have determined that KnowledgeBuilder loads the rest of the operators through EvaluatorRegistry, while KnowledgeAgent does nothing to load any operators into org.drools.base.evaluators.Operator. I have tried modifying KnowledgeAgent by adding the code below to the constructor of KnowledgeAgentImpl. This resolves the problem: with this addition, the ruleset with "after"-operator works as intended when loaded via a KnowledgeAgent.

// Load all of Drools' default evaluators instead of just the ones defined
// in org.drools.base.evaluators.Operator
new EvaluatorRegistry();

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