java.lang.RuntimeException: Child services [org.kie.api.internal.assembler.KieAssemblers] have no parent in RHDM/RHPAM

Issue

• I hit the following Exception when running my application

java.lang.ExceptionInInitializerError: null
    at org.kie.api.internal.utils.ServiceRegistry.getInstance(ServiceRegistry.java:27)
    at org.kie.api.KieServices$Factory$LazyHolder.<clinit>(KieServices.java:341)
    at org.kie.api.KieServices$Factory.get(KieServices.java:348)
    at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildDroolsScoreDirectorFactory(ScoreDirectorFactoryConfig.java:501)
    at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildScoreDirectorFactory(ScoreDirectorFactoryConfig.java:351)
    at org.optaplanner.core.config.solver.SolverConfig.buildSolver(SolverConfig.java:255)
    at org.optaplanner.core.impl.solver.AbstractSolverFactory.buildSolver(AbstractSolverFactory.java:61)
    ...
Caused by: java.lang.RuntimeException: Child services [org.kie.api.internal.assembler.KieAssemblers] have no parent
    at org.kie.api.internal.utils.ServiceDiscoveryImpl.buildMap(ServiceDiscoveryImpl.java:180)
    at org.kie.api.internal.utils.ServiceDiscoveryImpl.getServices(ServiceDiscoveryImpl.java:97)
    at org.kie.api.internal.utils.ServiceRegistryImpl.<init>(ServiceRegistryImpl.java:36)
    at org.kie.api.internal.utils.ServiceRegistryImpl$LazyHolder.<clinit>(ServiceRegistryImpl.java:32)
    ... 13 common frames omitted

• When packaging my drools application into a uber jar (fat jar), I see this NullPointerException like below when building KieBase / KieSession:

java.lang.NullPointerException
        at org.kie.internal.io.ResourceFactory.newByteArrayResource(ResourceFactory.java:66)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.getResource(AbstractKieModule.java:311)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:274)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:269)
        at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:257)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.buildKnowledgePackages(AbstractKieModule.java:201)
        at org.drools.compiler.kie.builder.impl.AbstractKieModule.createKieBase(AbstractKieModule.java:215)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:406)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.getKieBase(KieContainerImpl.java:374)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.getKieBaseFromKieSessionModel(KieContainerImpl.java:575)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:551)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:521)