Traversal serializing issue while creating Vertex

[Homesh Rawat]

Hi,

I am trying to create a vertex using the GraphTraversalSource and then using GraphStatement to execute statement. However, I am facing the following issue - 

Exception in thread "main" com.datastax.driver.core.exceptions.DriverException: Could not serialize Traversal's bytecode.

at com.datastax.dse.graph.internal.utils.GraphSONUtils.getStatementFromBytecodeRemoteSource(GraphSONUtils.java:111)

at com.datastax.dse.graph.internal.DseRemoteConnection.submitAsync(DseRemoteConnection.java:70)

at org.apache.tinkerpop.gremlin.process.remote.traversal.step.map.RemoteStep.promise(RemoteStep.java:89)

at org.apache.tinkerpop.gremlin.process.remote.traversal.step.map.RemoteStep.processNextStart(RemoteStep.java:65)

at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)

at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)

at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.next(DefaultTraversal.java:200)

at OVertex.createVertex(OVertex.java:13)

at Application.main(Application.java:34)

Caused by: org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: [no message for java.lang.NullPointerException]

at org.apache.tinkerpop.shaded.jackson.databind.ser.DefaultSerializerProvider._wrapAsIOE(DefaultSerializerProvider.java:509)

at org.apache.tinkerpop.shaded.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:482)

at org.apache.tinkerpop.shaded.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)

at org.apache.tinkerpop.shaded.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3893)

at org.apache.tinkerpop.shaded.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:3164)

at org.apache.tinkerpop.gremlin.structure.io.graphson.GraphSONWriter.writeObject(GraphSONWriter.java:184)

at com.datastax.dse.graph.internal.utils.GraphSONUtils.writeValueAsString(GraphSONUtils.java:79)

at com.datastax.dse.graph.internal.utils.GraphSONUtils.getStatementFromBytecodeRemoteSource(GraphSONUtils.java:108)

... 8 more

Caused by: java.lang.NullPointerException

at org.apache.tinkerpop.shaded.jackson.databind.jsontype.TypeSerializer.typeId(TypeSerializer.java:79)

at org.apache.tinkerpop.shaded.jackson.databind.ser.std.StdScalarSerializer.serializeWithType(StdScalarSerializer.java:44)

at org.apache.tinkerpop.shaded.jackson.databind.ser.impl.TypeWrappedSerializer.serialize(TypeWrappedSerializer.java:32)

at org.apache.tinkerpop.shaded.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)

... 14 more

The code for creating Vertex is following - 

public void createVertex(GraphTraversalSource g, String label, DseSession session) {
        if (Schema.isExists(session, label, Constants.VERTEX)) {

GraphStatement s1 = DseGraph.statementFromTraversal(g.addV(label));

session.executeGraph(s1);

}

}

Can you please help me with this issue?

-

Homesh

[Kevin Gallardo]

Hi Homesh, 

Which version of the driver are you using? Are you adding an extra dependency to Tinkerpop in your project and which version? This works for me with the Tinkerpop version that comes bundled with the driver.

Thanks.

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kgdo.me

Software Engineer in Developers Tools Team,

DataStax.

[Homesh Rawat]

Hi Kevin,

I am using 1.6.6 version of the dse-java-driver-core and dse-java-driver-graph.

Please have a look at the following pom file that I am using.

<dependency>

<groupId>com.datastax.dse</groupId>

<artifactId>dse-java-driver-core</artifactId>

<version>1.6.6</version>

</dependency>

<dependency>

<groupId>com.datastax.dse</groupId>

<artifactId>dse-java-driver-graph</artifactId>

<version>1.6.6</version>

</dependency>

<dependency>

<groupId>org.apache.tinkerpop</groupId>

<artifactId>gremlin-driver</artifactId>

<version>3.2.6</version>

</dependency>

<dependency>

<groupId>org.apache.tinkerpop</groupId>

<artifactId>gremlin-shaded</artifactId>

<version>3.3.2</version>

</dependency>

<dependency>

<groupId>com.tinkerpop</groupId>

<artifactId>gremlin-core</artifactId>

<version>3.0.0.M7</version>

</dependency>

[Kevin Gallardo]

Thanks for the details.

Indeed using different versions of separate TinkerPop artifacts is likely to cause problems here. 

Is there any reason why you wouldn't be able to have everything set to TinkerPop 3.3.2? The driver should be ok if you were to set 3.3.2 to all the tinkerpop artifacts there.

Hope that helps.

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[Homesh Rawat]

Thanks Kevin for the advice. 

Changing all the versions of tinkerpop to 3.3.2 worked.

-

Homesh

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