Gremlin 使用JanusGraph的ReferenceEdge序列化错误

在Java应用程序中使用Gremlin从远程JanusGraph服务器检索边缘列表时，我遇到序列化错误（错误消息和配置如下）

这是引发错误的遍历：

List<Edge> eList = g.E().toList();

但是，在检索顶点或顶点列表时，它可以完美地工作：

List<Vertex> vList = g.V().toList();

这是获取远程遍历的代码：

PropertiesConfiguration conf = new PropertiesConfiguration(remote-objects.yaml);
cluster = Cluster.open(conf.getString("gremlin.remote.driver.clusterFile"));
client = cluster.connect();
g = AnonymousTraversalSource.traversal().withRemote(propFileName);

这是我的服务器配置中的序列化程序：

serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  # Older serialization versions for backwards compatibility:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV1d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoLiteMessageSerializerV1d0, config: {ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV1d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV2d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV2d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV1d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { ioRegistries: [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV1d0, org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistryV1d0] }}

下面是错误消息：

java.util.concurrent.CompletionException: io.netty.handler.codec.DecoderException: org.apache.tinkerpop.gremlin.driver.ser.SerializationException: org.apache.tinkerpop.shaded.kryo.KryoException: java.lang.NegativeArraySizeException
Serialization trace:
id (org.apache.tinkerpop.gremlin.structure.util.reference.ReferenceEdge)
    at java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:375)
CompletableFuture.java:375
    at java.util.concurrent.CompletableFuture.join(CompletableFuture.java:1934)
CompletableFuture.java:1934
    at org.apache.tinkerpop.gremlin.driver.ResultSet.one(ResultSet.java:119)
ResultSet.java:119
    at org.apache.tinkerpop.gremlin.driver.ResultSet$1.hasNext(ResultSet.java:171)
ResultSet.java:171
    at org.apache.tinkerpop.gremlin.driver.ResultSet$1.next(ResultSet.java:178)
ResultSet.java:178
    at org.apache.tinkerpop.gremlin.driver.ResultSet$1.next(ResultSet.java:165)
ResultSet.java:165
    at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:140)
DriverRemoteTraversal.java:140
    at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal$TraverserIterator.next(DriverRemoteTraversal.java:125)
DriverRemoteTraversal.java:125
    at org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteTraversal.nextTraverser(DriverRemoteTraversal.java:106)
DriverRemoteTraversal.java:106
    at org.apache.tinkerpop.gremlin.process.remote.traversal.step.map.RemoteStep.processNextStart(RemoteStep.java:80)
RemoteStep.java:80
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)
AbstractStep.java:128
    at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)
AbstractStep.java:38
    at org.apache.tinkerpop.gremlin.process.traversal.Traversal.fill(Traversal.java:179)
Traversal.java:179
    at org.apache.tinkerpop.gremlin.process.traversal.Traversal.toList(Traversal.java:117)
Traversal.java:117
    at com.ibm.graph.App.main(App.java:25)
App.java:25
Caused by: io.netty.handler.codec.DecoderException: org.apache.tinkerpop.gremlin.driver.ser.SerializationException: org.apache.tinkerpop.shaded.kryo.KryoException: java.lang.NegativeArraySizeException

---

我相信您的问题在于驱动程序和服务器之间的序列化程序配置不匹配。对于驾驶员，您需要：

serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0,
              config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

但对于您拥有的服务器：

- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, 
    config: { ioRegistries [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0, 
                            org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

您忽略了驾驶员侧的注册表v3d0。对于

ioRegistries

注册表的添加顺序很重要。因此，如果您首先在服务器上添加了

JanusGraphiOreRegistry

，然后意外地在驱动程序上忽略了

TinkerIoRegistryV3d0

，那么您可能会很幸运，因为序列化程序注册标识符会与JanusGraph对齐

无论如何，将

注册表v3d0

添加到驱动程序配置中，或者将其从服务器配置中删除，一切都应该正常。作为旁注，如果要通过线路序列化TinkerGraph实例（例如，使用

子图（）

步骤），通常只需要

TinkerIoRegistryV3d0

serializer: { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0,
              config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}

- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, 
    config: { ioRegistries [org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerIoRegistryV3d0, 
                            org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}