Issue defining evidence in drl - related evidence java file is not getting generated

[Polly D]

Hi there, 

I am trying to convert the java defined evidence classes that is being used within the drools rules implementation in to drl files using the declare definition. When I add the evidence to the drl files and install & build the changes the related java files for the evidence is not getting generated so can not be found in the rules implementation or tests.  I have outlined a simple example and the steps I followed  below. If anyone has come across this issue or can identify any step I may have missed any help would be appreciated.

Issue - related drl java file is not generated

Error details - "java.lang.NullPointerException: Cannot invoke "org.kie.api.definition.type.FactType.newInstance()" because "caseHeaderFactType" is null"

The definition of the fact type 'CaseHeaderFact' is not available as a fact type to create an instance of this object in a test. This java generated definition file is not getting created.  

Steps to define  an evidence file in drl. 

• Add the drl file to the package structure that within that defined in the kmodule.xml file package location . For example locate the evidence definition drl files in  the folder 'evidence' 
• Add the declare <EvidenceName> and the attributes with type defined. See https://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html/ch05.html '5.7.1 Declaring new types'

package evidence;

 

declare CaseHeaderFact

  long : caseID;

  CaseType : caseType;

end

• Update the pom xml file to include the dependencies for model generation and complete a maven update, and install

    <dependency>

      <groupId>org.drools</groupId>

      <artifactId>drools-model-compiler</artifactId>

      <version>${drools.version}</version>

    </dependency>

    <dependency>

      <groupId>org.drools</groupId>

      <artifactId>drools-canonical-model</artifactId>

      <version>${drools.version}</version>

    </dependency>

• Create an instance of the evidence fact from a unit test 

     FactType caseHeaderFactType = session.getKieBase().getFactType("evidence",  "CaseHeaderFact");

     Object caseHeader = caseHeaderFactType.newInstance(); 

     caseHeaderFactType.set(caseHeader, "caseID", 101);

     caseHeaderFactType.set(caseHeader, "caseType", CaseType.PRODUCTDELIVERY);

     factList.add(caseHeaderFactType);