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Marko A. Rodriguez edited comment on TINKERPOP-1428 at 11/3/16 2:36 PM: ------------------------------------------------------------------------ So, I've isolated it to {{GroupSideEffectStep}}. {code} gremlin> g.V().union(groupCount(),group()).profile() ==>Traversal Metrics Step Count Traversers Time (ms) % Dur ============================================================================================================= TinkerGraphStep(vertex,[]) 6 6 0.083 21.89 UnionStep([[GroupCountStep, ProfileStep, EndSte... 2 2 0.297 78.11 GroupCountStep 1 1 0.037 EndStep 1 1 0.012 GroupStep([FoldStep, ProfileStep]) 1 1 0.115 FoldStep 6 6 0.050 EndStep 1 1 0.032 >TOTAL - - 0.380 - gremlin> g.V().union(groupCount('m'),group()).profile() ==>Traversal Metrics Step Count Traversers Time (ms) % Dur ============================================================================================================= TinkerGraphStep(vertex,[]) 6 6 0.055 11.83 UnionStep([[GroupCountSideEffectStep(m), Profil... 7 7 0.415 88.17 GroupCountSideEffectStep(m) 6 6 0.104 EndStep 6 6 0.025 GroupStep([FoldStep, ProfileStep]) 1 1 0.110 FoldStep 6 6 0.044 EndStep 1 1 0.039 >TOTAL - - 0.470 - gremlin> g.V().union(groupCount(),group('m')).profile() java.lang.NullPointerException Type ':help' or ':h' for help. Display stack trace? [yN] {code} And it behaves the same with {{choose()}}, {{repeat()}}, etc. {code} gremlin> g.V().repeat(group('m')).times(2).profile() java.lang.NullPointerException Type ':help' or ':h' for help. Display stack trace? [yN] {code} was (Author: okram): So, I've isolated it to `GroupSideEffectStep`. ``` gremlin> g.V().union(groupCount(),group()).profile() ==>Traversal Metrics Step Count Traversers Time (ms) % Dur ============================================================================================================= TinkerGraphStep(vertex,[]) 6 6 0.083 21.89 UnionStep([[GroupCountStep, ProfileStep, EndSte... 2 2 0.297 78.11 GroupCountStep 1 1 0.037 EndStep 1 1 0.012 GroupStep([FoldStep, ProfileStep]) 1 1 0.115 FoldStep 6 6 0.050 EndStep 1 1 0.032 >TOTAL - - 0.380 - gremlin> g.V().union(groupCount('m'),group()).profile() ==>Traversal Metrics Step Count Traversers Time (ms) % Dur ============================================================================================================= TinkerGraphStep(vertex,[]) 6 6 0.055 11.83 UnionStep([[GroupCountSideEffectStep(m), Profil... 7 7 0.415 88.17 GroupCountSideEffectStep(m) 6 6 0.104 EndStep 6 6 0.025 GroupStep([FoldStep, ProfileStep]) 1 1 0.110 FoldStep 6 6 0.044 EndStep 1 1 0.039 >TOTAL - - 0.470 - gremlin> g.V().union(groupCount(),group('m')).profile() java.lang.NullPointerException Type ':help' or ':h' for help. Display stack trace? [yN] ``` And it behaves the same with `choose()`, `repeat()`, etc. ``` gremlin> g.V().repeat(group('m')).times(2).profile() java.lang.NullPointerException Type ':help' or ':h' for help. Display stack trace? [yN] ``` > profile() throws NPE for union(group, group) > -------------------------------------------- > > Key: TINKERPOP-1428 > URL: https://issues.apache.org/jira/browse/TINKERPOP-1428 > Project: TinkerPop > Issue Type: Bug > Components: process > Affects Versions: 3.2.1 > Reporter: Daniel Kuppitz > > {noformat} > gremlin> g.V().union(group("m").by("name"), group("m").by("name")).profile() > java.lang.NullPointerException > Type ':help' or ':h' for help. > Display stack trace? [yN]y > java.lang.NullPointerException > at > org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:239) > at > org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:251) > at > org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:254) > at > org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.setMetrics(DefaultTraversalMetrics.java:204) > at > org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.ProfileSideEffectStep.hasNext(ProfileSideEffectStep.java:73) > at > org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.hasNext(ExpandableStepIterator.java:42) > at > org.apache.tinkerpop.gremlin.process.traversal.step.util.SupplyingBarrierStep.processAllStarts(SupplyingBarrierStep.java:83) > at > org.apache.tinkerpop.gremlin.process.traversal.step.util.SupplyingBarrierStep.processNextStart(SupplyingBarrierStep.java:70) > at > org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143) > at > org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:179) > at > org.apache.tinkerpop.gremlin.console.Console$_closure3.doCall(Console.groovy:226) > at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) > at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) > at > org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294) > at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024) > at > org.codehaus.groovy.tools.shell.Groovysh.setLastResult(Groovysh.groovy:446) > at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:190) > at > org.apache.tinkerpop.gremlin.console.GremlinGroovysh.super$3$execute(GremlinGroovysh.groovy) > at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) > at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) > at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215) > at > org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132) > at > org.apache.tinkerpop.gremlin.console.GremlinGroovysh.execute(GremlinGroovysh.groovy:72) > at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:122) > at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:95) > at > org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy) > at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) > at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) > at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215) > at > org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132) > at > org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152) > at > org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:124) > at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:59) > at > org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at > org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) > at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) > at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215) > at > org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132) > at > org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152) > at > org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:83) > at > org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232) > at org.apache.tinkerpop.gremlin.console.Console.<init>(Console.groovy:152) > at > org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232) > at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:449) > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)