I have the following test: public void testFireAllRules() { rulesManager = RulesManager.getInstance(); assertNotNull(rulesManager); StatefulSession session = rulesManager.getStatefulSession("com.dfs.dc.servicing.cms.cid.verification.test"); assertNotNull(session); Account account = new Account(); account.setAccountNumber("6011006500000"); account.setBalance(200); account.setDaysDelinquent(32); //insert a fact FactHandle accountHandle = session.insert(account); System.out.println(accountHandle.toExternalForm()); session.fireAllRules(); //insert a fact //FactHandle accountHandle2 = session.insert(account); //System.out.println(accountHandle2.toExternalForm()); account.setBalance(300); session.modifyInsert(accountHandle, account); System.out.println(accountHandle.toExternalForm()); } When I call modifyInsert I receive a NullPointerException with the following stacktrace: java.lang.NullPointerException at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:169) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143) at org.drools.common.AbstractWorkingMemory.modifyInsert(AbstractWorkingMemory.java:1226) at org.drools.common.AbstractWorkingMemory.modifyInsert(AbstractWorkingMemory.java:1183) at com.dfs.ecc.framework.client.rules.test.RulesManagerTest.testFireAllRules(RulesManagerTest.java:110) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:62) at org.eclipse.pde.internal.junit.runtime.CoreTestApplication.run(CoreTestApplication.java:23) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:574) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:195) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504) at org.eclipse.equinox.launcher.Main.run(Main.java:1236) at org.eclipse.equinox.launcher.Main.main(Main.java:1212) I have tried it with both shadow facts enabled and disabled (just fishing here) I checked the session and can see that the fact is there with the same ID after the fireAllRules has returned. An insert works fine but the modifyInsert does not. Thanks -- View this message in context: http://www.nabble.com/NullPointerException-on-modifyInsert-tp20627245p206... Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users