KnowledgeBaseImpl.addKnowledgePackage requires the KP to be a KPImpl -------------------------------------------------------------------- Key: JBRULES-1931 URL: https://jira.jboss.org/jira/browse/JBRULES-1931 Project: JBoss Drools Issue Type: Bug Security Level: Public (Everyone can see) Components: drools-core Affects Versions: 5.0.0.M5 Reporter: peter royal Assignee: Mark Proctor Priority: Minor Wanting to hand-roll my own rules, I started out by instantiating a KnowledgeBase and went to add a KnowledgePackage. I was then confronted with: {noformat} java.lang.ClassCastException: com.example.MyKP cannot be cast to org.drools.definitions.impl.KnowledgePackageImp at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:115) {noformat} .. while API wrappers are appreciated, if one can't pass in alternate implementations of interfaces, the dependency should be on the required type, rather than allowing a ClassCastException to occur at runtime -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira