KnowledgeAgent.applyChangeSet(notExistingResource) should throw an understandable exception instead of a NullPointerException ----------------------------------------------------------------------------------------------------------------------------- Key: JBRULES-3042 URL: https://issues.jboss.org/browse/JBRULES-3042 Project: Drools Issue Type: Bug Security Level: Public (Everyone can see) Reporter: Geoffrey De Smet Fix For: 5.3.0.M1 Discovered by the guvnor-examples MortgageClientExample The exception is essentially eaten here in KnowledgeAgentImpl: {code} try { changeSet = reader.read( resource.getReader() ); } catch ( Exception e ) { this.listener.exception( new RuntimeException( "Unable to parse ChangeSet", e ) ); } {code} OK, it logs it, but it doesn't throw an exception (might be related to use of the Agent in spring??? where we don't want it to die on a network IO problem?). Instead a NPE occurs later because the changeSet is still null: {code} Exception in thread "main" java.lang.NullPointerException at org.drools.agent.impl.KnowledgeAgentImpl.processChangeSet(KnowledgeAgentImpl.java:223) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:189) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:174) at org.drools.guvnor.examples.mortgage.client.MortgageClientExample.readKnowledgeBase(MortgageClientExample.java:81) at org.drools.guvnor.examples.mortgage.client.MortgageClientExample.main(MortgageClientExample.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:115) {code} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira