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  1. Red Hat Decision Manager
  2. RHDM-1774

Error converting "drools" variable into KnowledgeHelper class with drools-model-compiler

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Details

    • Bug
    • Resolution: Not a Bug
    • Major
    • None
    • 7.11.0.GA
    • BRE
    • None
    • False
    • False
    • Undefined
    • Hide

      Workaround-1: Avoid using "drools-model-compiler" 

      Workaround-2: Avoid converting "drools" variable directly into "org.drools.core.spi.KnowledgeHelper". We can update the "var_drools.drl" file with following , and convert it into "org.drools.core.definitions.rule.impl.RuleImpl" inside PrintDroolsInfo.java

      
PrintDroolsInfo.print(drools.getRule());
      Show
      Workaround-1: Avoid using "drools-model-compiler"  Workaround-2: Avoid converting "drools" variable directly into "org.drools.core.spi.KnowledgeHelper". We can update the "var_drools.drl" file with following , and convert it into "org.drools.core.definitions.rule.impl.RuleImpl" inside PrintDroolsInfo.java PrintDroolsInfo.print(drools.getRule());
    • Hide

      1) In attached reproducer project "precompile-demo" folder, do "$ mvn clean package" and review the error output

      2) Commenting out "drools-model-compiler" dependency in project pom.xml will lead to successful build

      3) The same project can be compiled with RHDM 7.6.0 dependencies (7.30.0.Final-redhat-00003)

      Show
      1) In attached reproducer project "precompile-demo" folder, do "$ mvn clean package" and review the error output 2) Commenting out "drools-model-compiler" dependency in project pom.xml will lead to successful build 3) The same project can be compiled with RHDM 7.6.0 dependencies (7.30.0.Final-redhat-00003)
    • 2021 Week 28-30 (from Jul 12)

    Description

      When using "drools-model-compiler" to build a rule which uses "drools" built-in variable and tries to convert it into KnowledgeHelper class, following error will be reported in compilation :

      
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile-1) on project precompile-demo: Compilation failure
[ERROR] /path/to/precompile-demo/target/generated-sources/drools-model-compiler/main/java/com/ex/demo/PF0/LambdaConsequenceF05F900892C9C0080DD3CE63F75D4E84.java:[21,35] incompatible types: org.drools.model.Drools cannot be converted to org.drools.core.spi.KnowledgeHelper

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          is documented by

          Task - Represents a small unit of work that is not end-user facing. DROOLS-6490 Fix drools docs to avoid mentioning the KnowledgeHelper and replace it with the RuleContext

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Resolved

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              mfusco@redhat.com Mario Fusco
              rhn-support-lywang Lyle Wang (Inactive)
              Daniel Rosa Daniel Rosa
              Daniel Rosa Daniel Rosa
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                Created:
                Updated:
                Resolved: