Getting Null pointer exception

[padmasr...@googlemail.com]

In  janus graph db.. I have more than 10 labels..

recently I have changed a property key's datatype(property name: counter)..after that I am getting null pointer exception from a particular label(label name: labelA)and which is the only label(labelA) that using the propertykey(counter) that I changed recently..

so I tried to drop all vertex in that label and then tried to drop the label using below query..both are not working..instead getting NPE

1)mgmt.getVertexLabel("labelA").remove()

2)graph.V().hasLabel("labelA").drop()

then I tried following:

I am able to add new vertex to labelA

graph.addVertex(label,"labelA","name","xyz","counter","123")

when I try to retrieve, I am getting newly added vertex with null pointer exception

g.V().hasLabel("labelA").valueMap()

[name:[xyz],counter:[123]]

java.lang.NullPointerException

Type ':help' or ':h' for help.

Display stack trace? [yN]y

java.lang.NullPointerException

at org.janusgraph.graphdb.database.EdgeSerializer.parseRelation(EdgeSerializer.java:128)

at org.janusgraph.graphdb.database.EdgeSerializer.readRelation(EdgeSerializer.java:73)

at org.janusgraph.graphdb.transaction.RelationConstructor.readRelation(RelationConstructor.java:75)

at org.janusgraph.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:60)

at org.janusgraph.graphdb.transaction.RelationConstructor$1$1.next(RelationConstructor.java:48)

at org.apache.tinkerpop.gremlin.process.traversal.step.map.PropertyMapStep.map(PropertyMapStep.java:70)

at org.apache.tinkerpop.gremlin.process.traversal.step.map.PropertyMapStep.map(PropertyMapStep.java:46)

at org.apache.tinkerpop.gremlin.process.traversal.step.map.MapStep.processNextStart(MapStep.java:37)

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:198)

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)...

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)

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.GeneratedMethodAccessor40.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:455)

all the other labels are working except this label...Kindly help me how can I resolve this problem??

[Robert Dale]

AFAIK, remove() is not actually supported on schema elements but JanusGraph lets you do it anyway.

See the supported way of dealing with schema changes - http://docs.janusgraph.org/latest/schema.html#_changing_schema_elements

Robert Dale

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