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Distributed Graph Database
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NPE in StandardTitanGraph$3.apply() #1176

Open OndraZizka opened 9 years ago

OndraZizka commented 9 years ago

Hi, we have experienced a NPE with Titan 0.5.4.

It's not much reproducible, this is the first time I see it. Posting in case it's useful.

Regards.

Nov 04, 2015 5:49:17 PM com.thinkaurelius.titan.graphdb.database.StandardTitanGraph commit SEVERE: Could not commit transaction [78] due to exception java.lang.NullPointerException at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph$3.apply(StandardTitanGraph.java:573) at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph$3.apply(StandardTitanGraph.java:570) at com.google.common.collect.Iterators$8.computeNext(Iterators.java:736) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) at com.google.common.collect.Iterables.isEmpty(Iterables.java:1028) at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.commit(StandardTitanGraph.java:618) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit(StandardTitanTx.java:1337) at com.thinkaurelius.titan.graphdb.blueprints.TitanBlueprintsGraph.commit(TitanBlueprintsGraph.java:60) at org.jboss.windup.config.RuleSubset.perform(RuleSubset.java:284) at org.jboss.windup.exec.WindupProcessorImpl.execute(WindupProcessorImpl.java:150) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) at org.jboss.windup.exec.WindupProcessorImpl_$$_javassist8404f3f0-d805-4922-83df-015601b2431a.execute(WindupProcessorImpl$$_javassist8404f3f0-d805-4922-83df-015601b2431a.java) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:160) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:125) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:114) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest.testRunWindupScanPackages(WindupArchitectureScanPackagesTest.java:54) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest$$_javassiste85b5048-3503-47ab-93f5-1ceaf7229602.testRunWindupScanPackages(WindupArchitectureScanPackagesTest$$_javassiste85b5048-3503-47ab-93f5-1ceaf7229602.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$2.call(ClassLoaderAdapterCallback.java:123) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.invoke(ClassLoaderAdapterCallback.java:96) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest$$_javassist642c0cba-7ff8-41e6-a7e7-0e22258afb1b.testRunWindupScanPackages(WindupArchitectureScanPackagesTest$$_javassist_642c0cba-7ff8-41e6-a7e7-0e22258afb1b.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.arquillian.impl.FurnaceTestMethodExecutor.invoke(FurnaceTestMethodExecutor.java:138) at org.jboss.arquillian.container.test.impl.execution.RemoteTestExecuter.execute(RemoteTestExecuter.java:109) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:116) at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) at org.jboss.arquillian.container.test.impl.execution.ClientTestExecuter.execute(ClientTestExecuter.java:57) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:142) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createTestContext(ContainerEventController.java:129) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:73) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:130) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:92) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:136) at org.jboss.arquillian.junit.Arquillian$8.evaluate(Arquillian.java:363) at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:245) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:422) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:54) at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:259) at org.jboss.arquillian.junit.Arquillian$7.evaluate(Arquillian.java:321) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:204) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:422) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:54) at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:218) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:166) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283) at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128) at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)

Nov 04, 2015 5:49:17 PM org.jboss.windup.config.RuleSubset perform SEVERE: Error encountered while evaluating rule: .addRule().when(Query.find(org.jboss.windup.reporting.model.ReportModel).gremlin().has(templateType,EQUALS,FREEMARKER).as(default)).perform(org.jboss.windup.reporting.rules.rendering.RenderReportRuleProvider$FreeMarkerThreadedRenderer@217b1674).withId("RenderReportRuleProvider1") Could not commit transaction due to exception during persistence com.thinkaurelius.titan.core.TitanException: Could not commit transaction due to exception during persistence at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit(StandardTitanTx.java:1348) at com.thinkaurelius.titan.graphdb.blueprints.TitanBlueprintsGraph.commit(TitanBlueprintsGraph.java:60) at org.jboss.windup.config.RuleSubset.perform(RuleSubset.java:284) at org.jboss.windup.exec.WindupProcessorImpl.execute(WindupProcessorImpl.java:150) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) at org.jboss.windup.exec.WindupProcessorImpl$$_javassist8404f3f0-d805-4922-83df-015601b2431a.execute(WindupProcessorImpl$$_javassist8404f3f0-d805-4922-83df-015601b2431a.java) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:160) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:125) at org.jboss.windup.tests.application.WindupArchitectureTest.runTest(WindupArchitectureTest.java:114) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest.testRunWindupScanPackages(WindupArchitectureScanPackagesTest.java:54) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest$$_javassiste85b5048-3503-47ab-93f5-1ceaf7229602.testRunWindupScanPackages(WindupArchitectureScanPackagesTest$$_javassiste85b5048-3503-47ab-93f5-1ceaf7229602.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback$2.call(ClassLoaderAdapterCallback.java:123) at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:42) at org.jboss.forge.furnace.proxy.ClassLoaderAdapterCallback.invoke(ClassLoaderAdapterCallback.java:96) at org.jboss.windup.tests.application.WindupArchitectureScanPackagesTest$$_javassist642c0cba-7ff8-41e6-a7e7-0e22258afb1b.testRunWindupScanPackages(WindupArchitectureScanPackagesTest$$_javassist_642c0cba-7ff8-41e6-a7e7-0e22258afb1b.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.forge.arquillian.impl.FurnaceTestMethodExecutor.invoke(FurnaceTestMethodExecutor.java:138) at org.jboss.arquillian.container.test.impl.execution.RemoteTestExecuter.execute(RemoteTestExecuter.java:109) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:116) at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) at org.jboss.arquillian.container.test.impl.execution.ClientTestExecuter.execute(ClientTestExecuter.java:57) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createContext(ContainerEventController.java:142) at org.jboss.arquillian.container.test.impl.client.ContainerEventController.createTestContext(ContainerEventController.java:129) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:73) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:130) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:92) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:94) at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:145) at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:136) at org.jboss.arquillian.junit.Arquillian$8.evaluate(Arquillian.java:363) at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:245) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:422) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:54) at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:259) at org.jboss.arquillian.junit.Arquillian$7.evaluate(Arquillian.java:321) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:204) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:422) at org.jboss.arquillian.junit.Arquillian.access$200(Arquillian.java:54) at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:218) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:166) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283) at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128) at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103) Caused by: java.lang.NullPointerException at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph$3.apply(StandardTitanGraph.java:573) at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph$3.apply(StandardTitanGraph.java:570) at com.google.common.collect.Iterators$8.computeNext(Iterators.java:736) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) at com.google.common.collect.Iterables.isEmpty(Iterables.java:1028) at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.commit(StandardTitanGraph.java:618) at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit(StandardTitanTx.java:1337) ... 113 more

spmallette commented 8 years ago

Are you still seeing this exception? I remember reading this some time ago, but nothing jumped out at me as an error i commonly see.

dalaro commented 8 years ago

For reference, the innermost stacktrace line: https://github.com/thinkaurelius/titan/blob/0.5.4/titan-core/src/main/java/com/thinkaurelius/titan/graphdb/database/StandardTitanGraph.java#L573

graben1437 commented 8 years ago

I am happy to look into this, but am a bit clueless at how to start with reproducing it. If there are any suggestions on how to reproduce this, please let me know.

graben1437 commented 8 years ago

Intellij cautions for the apply() method:

Method invocation ‘internalRelation.getType()’ may produce ‘java.lang.NullPointerException’ This inspection analyzes method control and data flow to report possible conditions that are always true or false, expressions whose value is statically proven to be constant, and situations that can lead to nullability contract violations. <<

This is due to the possibility that internalRelation could be null and there are no checks on this object prior to attempting to make method calls on it.

This doesn't explain the big picture" yet and whether it is valid for internalRelation to be null in any cases, but is a plausible explanation for the generation of the null pointer exception.