[rules-users] NullPointerException on modifyInsert

[Edson Tirelli]

   You must always use modifyRetract()+modifyInsert() as a pair of methods.
So you must always do:

session.modifyRetract(accountHandle);
...
// change all you want in your accound
account.setBalance(300);
...
session.modifyInsert(accountHandle, account);

   []s
   Edson

2008/11/21 keithnielsen <keithnielsen at discover.com>

>
> 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-tp20627245p20627245.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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