kie-maven-plugin fails to generate model with a mix of Java and DRL facts - drools

Question

I'm trying to generate a fully compiled kmodule with kie-maven-plugin. It works when all facts are defined in DRL, but fails when some facts are defined as Java POJOs.
In the same project:
Java fact (src\main\java\org\example\FactA.java):
package org.example;
public class FactA {
private String propA;
public FactA() { }
public FactA(String propA) {
this.propA = propA;
}
public String getPropA() {
return propA;
}
public void setPropA(String propA) {
this.propA = propA;
}
}
DRL Fact (src\main\resources\org\example\decB.drl):
package org.example
import org.example.FactA
declare FactB
factA: FactA
propB : String
end
POM:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<properties>
<generateModel>YES</generateModel>
<runtime.version>7.20.0.Final</runtime.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<groupId>org</groupId>
<artifactId>example</artifactId>
<version>1.0.0</version>
<packaging>kjar</packaging>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-bom</artifactId>
<version>${runtime.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-model-compiler</artifactId>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-canonical-model</artifactId>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.kie</groupId>
<artifactId>kie-maven-plugin</artifactId>
<version>${runtime.version}</version>
<extensions>true</extensions>
</plugin>
</plugins>
</build>
</project>
Output of mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------------< org:example >-----------------------------
[INFO] Building example 1.0.0
[INFO] --------------------------------[ kjar ]--------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) # example ---
[INFO] Deleting C:\Projects\t\kie-maven-plugin-example\target
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) # example ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 3 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) # example ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 1 source file to C:\Projects\t\kie-maven-plugin-example\target\classes
[INFO]
[INFO] --- kie-maven-plugin:7.20.0.Final:generateModel (default-generateModel) # example ---
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-core/7.20.0.Final/drools-core-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.core.io.impl.ResourceFactoryServiceImpl
[INFO] Adding Service org.drools.core.marshalling.impl.MarshallerProviderImpl
[INFO] Adding Service org.drools.core.concurrent.ExecutorProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-compiler/7.20.0.Final/drools-compiler-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.compiler.kie.builder.impl.KieServicesImpl
[INFO] Adding Service org.drools.compiler.builder.impl.KnowledgeBuilderFactoryServiceImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-model-compiler/7.20.0.Final/drools-model-compiler-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.modelcompiler.CanonicalKieModuleProvider
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/kie/kie-internal/7.20.0.Final/kie-internal-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.kie.internal.services.KieAssemblersImpl
[INFO] Adding Service org.kie.internal.services.KieRuntimesImpl
[INFO] Adding Service org.kie.internal.services.KieWeaversImpl
[INFO] Adding Service org.kie.internal.services.KieBeliefsImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-decisiontables/7.20.0.Final/drools-decisiontables-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.decisiontable.DecisionTableProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-scorecards/7.20.0.Final/drools-scorecards-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.scorecards.ScoreCardProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/kie-pmml/7.20.0.Final/kie-pmml-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service +org.kie.pmml.assembler.PMMLAssemblerService
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/jbpm/jbpm-bpmn2/7.20.0.Final/jbpm-bpmn2-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.jbpm.bpmn2.BPMN2ProcessProviderImpl
[INFO] Adding Service org.jbpm.bpmn2.xml.XmlProcessDumperFactoryServiceImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/jbpm/jbpm-flow-builder/7.20.0.Final/jbpm-flow-builder-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.jbpm.process.builder.ProcessBuilderFactoryServiceImpl
[INFO] Adding Service +org.jbpm.assembler.BPMN2AssemblerService
[INFO] Adding Service +org.jbpm.weaver.BPMN2WeaverService
[INFO] Adding Service +org.jbpm.assembler.DRFAssemblerService
[INFO] Adding Service +org.jbpm.weaver.DRFWeaverService
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/jbpm/jbpm-flow/7.20.0.Final/jbpm-flow-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.jbpm.marshalling.impl.ProcessMarshallerFactoryServiceImpl
[INFO] Adding Service org.jbpm.process.instance.ProcessRuntimeFactoryServiceImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/jbpm/jbpm-case-mgmt-cmmn/7.20.0.Final/jbpm-case-mgmt-cmmn-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.jbpm.casemgmt.cmmn.CMMNCaseProviderImpl
[INFO] Adding Service +org.jbpm.casemgmt.cmmn.assembler.CMMNAssemblerService
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-workbench-models-guided-dtable/7.20.0.Final/drools-workbench-models-guided-dtable-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.workbench.models.guided.dtable.backend.GuidedDecisionTableProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-workbench-models-guided-template/7.20.0.Final/drools-workbench-models-guided-template-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.workbench.models.guided.template.backend.GuidedRuleTemplateProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/drools/drools-workbench-models-guided-scorecard/7.20.0.Final/drools-workbench-models-guided-scorecard-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service org.drools.workbench.models.guided.scorecard.backend.GuidedScoreCardProviderImpl
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/optaplanner/optaplanner-core/7.20.0.Final/optaplanner-core-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service +org.optaplanner.core.impl.solver.kie.KieSolverAssemblerService
[INFO] Loading kie.conf from jar:file:/C:/Users/Dmitri/.m2/repository/org/kie/kie-dmn-core/7.20.0.Final/kie-dmn-core-7.20.0.Final.jar!/META-INF/kie.conf in classloader ClassRealm[extension>org.kie:kie-maven-plugin:7.20.0.Final, parent: sun.misc.Launcher$AppClassLoader#7852e922]
[INFO] Adding Service +org.kie.dmn.core.assembler.DMNAssemblerService
[INFO] Adding Service +org.kie.dmn.core.runtime.DMNRuntimeService
[INFO] Adding Service +org.kie.dmn.core.weaver.DMNWeaverService
[INFO] Artifact not fetched from maven: org.drools:drools-bom:${runtime.version}. To enable the KieScanner you need kie-ci on the classpath
[ERROR] package org.example
public class FactB implements org.drools.core.factmodel.GeneratedFact, java.io.Serializable {
public FactB() {
}
public FactB(FactA factA, String propB) {
super();
this.factA = factA;
this.propB = propB;
}
#org.kie.api.definition.type.Position(value = 0)
private FactA factA;
public void setFactA(FactA factA) {
this.factA = factA;
}
public FactA getFactA() {
return factA;
}
#org.kie.api.definition.type.Position(value = 1)
private String propB;
public void setPropB(String propB) {
this.propB = propB;
}
public String getPropB() {
return propB;
}
#Override()
public String toString() {
return "FactB" + "( " + "factA=" + factA + ", " + "propB=" + propB + " )";
}
}
[ERROR] Unable to build KieBaseModel:defaultKieBase
CompilationProblemErrorResult: cannot find symbol
symbol: class FactA
location: package org.example
CompilationProblemErrorResult: cannot find symbol
symbol: class FactA
location: class org.example.FactB
CompilationProblemErrorResult: cannot find symbol
symbol: class FactA
location: class org.example.FactB
CompilationProblemErrorResult: cannot find symbol
symbol: class FactA
location: class org.example.FactB
CompilationProblemErrorResult: cannot find symbol
symbol: class FactA
location: class org.example.FactB
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.465 s
[INFO] Finished at: 2019-04-26T09:00:16-04:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.kie:kie-maven-plugin:7.20.0.Final:generateModel (default-generateModel) on project example: Execution default-generateModel of goal org.kie:kie-maven-plugin:7.20.0.Final:generateModel failed: Unable to get KieModule, Errors Existed: Error Messages:
[ERROR] Message [id=1, kieBase=defaultKieBase, level=ERROR, path=null, line=5, column=0
[ERROR] text=cannot find symbol
[ERROR] symbol: class FactA
[ERROR] location: package org.example]
[ERROR] Message [id=2, kieBase=defaultKieBase, level=ERROR, path=null, line=12, column=0
[ERROR] text=cannot find symbol
[ERROR] symbol: class FactA
[ERROR] location: class org.example.FactB]
[ERROR] Message [id=3, kieBase=defaultKieBase, level=ERROR, path=null, line=19, column=0
[ERROR] text=cannot find symbol
[ERROR] symbol: class FactA
[ERROR] location: class org.example.FactB]
[ERROR] Message [id=4, kieBase=defaultKieBase, level=ERROR, path=null, line=21, column=0
[ERROR] text=cannot find symbol
[ERROR] symbol: class FactA
[ERROR] location: class org.example.FactB]
[ERROR] Message [id=5, kieBase=defaultKieBase, level=ERROR, path=null, line=25, column=0
[ERROR] text=cannot find symbol
[ERROR] symbol: class FactA
[ERROR] location: class org.example.FactB]
[ERROR] ---
[ERROR] Warning Messages:
[ERROR] ---
[ERROR] Info Messages:
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

Answer 1

It's probably a bug in the generation of declared types with the executable model.
Can you kindly post your reproducer here?
https://issues.jboss.org/projects/DROOLS/issues
In the meanwhile, as a workaround, can you try use the fully qualified name while using the class in the declared type?
package org.example
declare FactB
factA: org.example.FactA
propB : String
end
I've tried this against current master and it works.
Thanks for your help
It was a bug fixed here
https://github.com/kiegroup/drools/commit/c36f3ebf1f02e54742c8b4056e7b64bb5deaed07
Thanks for reporting