[jboss-jira] [JBoss JIRA] Created: (JBRULES-1289) BRMS gives unusable error messages when validating DSL based rules

[Phil Verghese (JIRA)]

BRMS gives unusable error messages when validating DSL based rules
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                 Key: JBRULES-1289
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1289
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-brms
    Affects Versions: 4.0.2
            Reporter: Phil Verghese
         Assigned To: Mark Proctor


The error messages that are shown when you click "Validate" when editing a business rule that uses a DSL in the BRMS are not user-friendly at all. If I make a small typo and misspell the name of an attribute (a very likely thing for a BRMS user to do), and click the Validate button, the error I get back is a big stack trace starting with "java.lang.RuntimeException: SNO: Conversion failed at org.codehaus.janino.UnitCompiler.numericPromotion(UnitCompiler.java) at ..." Nowhere in that stack trace is anything that gives a hint that
the error is just a typo of an attribute name.

Contrast this with the rather helpful error message I get if I make the same typo when editing a DRL rule: "Unable to create Field Extractor for 'overtimHours'". (The error is that I misspelled overtimeHours). 

The BRMS needs to give the same type of helpful error message on validation errors when editing a DSL rule.

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