Here is my snippet of my code in 5.5.0.Final import org.drools.KnowledgeBase; import org.drools.agent.KnowledgeAgent; import org.drools.agent.KnowledgeAgentFactory; import org.drools.definition.type.FactType; import org.drools.io.ResourceFactory; import org.drools.runtime.StatelessKnowledgeSession; KnowledgeAgent ka = KnowledgeAgentFactory.newKnowledgeAgent("MyAgent"); ka.applyChangeSet( ResourceFactory.newClassPathResource("src/main/resources/ChangeSet.xml") ); KnowledgeBase kb = ka.getKnowledgeBase(); FactType factType = kb.getFactType("org.numbercompare","NumberCompare"); Object nc = factType.newInstance(); factType.set( nc, "numberone",numberone ); factType.set( nc, "numbertwo", numbertwo ); StatelessKnowledgeSession ks = kb.newStatelessKnowledgeSession(); ks.execute(nc); I get the following error java.lang.RuntimeException: Provider org.drools.agent.impl.KnowledgeAgentProviderImpl could not be set Here are my dependencies in pom.xml <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>5.5.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>5.5.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>knowledge-api</artifactId> <version>5.5.0.Final</version> </dependency> -- View this message in context: http://drools.46999.n3.nabble.com/Drools-5-5-0-Runtime-Exception-java-lan... Sent from the Drools: User forum mailing list archive at Nabble.com.