不支持的记录类型异常：OrientDb，Gremlin，Java

Question

我在我的Java类中使用Groovy gremlin来遍历orient-db并查看下面的问题。如果我使用：

g.V('@class','Person').has('city-name','NY').in('city-depends').toList()

我得到了基于城市的人，如果我尝试使用变换也可以获得使用边缘朋友的朋友

g.V('@class','Person').has('city-name','NY').in('city-  depends').transform({[it,it.in('friends').toList()]}).toList()

我想要的是基于城市的人与他们的朋友信息（不仅是边缘ID）的信息

堆栈跟踪：

com.orientechnologies.orient.core.exception.OStorageException: Error on executing command: 

at com.orientechnologies.orient.client.remote.OStorageRemote.handleException(OStorageRemote.java:1481)

at com.orientechnologies.orient.client.remote.OStorageRemote.command(OStorageRemote.java:1059)

at com.orientechnologies.orient.client.remote.OStorageRemoteThread.command(OStorageRemoteThread.java:430)

at com.orientechnologies.orient.core.command.OCommandRequestTextAbstract.execute(OCommandRequestTextAbstract.java:59)

at orientdb.prototype.OrientGremlinExample.getActivityByResource(OrientGremlinExample.java:87)

at orientdb.prototype.OrientGremlinExample.main(OrientGremlinExample.java:26)

Caused by: java.lang.IllegalArgumentException: Unsupported record type: 0

at com.orientechnologies.orient.core.record.ORecordFactoryManager.newInstance(ORecordFactoryManager.java:93)

at com.orientechnologies.orient.enterprise.channel.binary.OChannelBinaryProtocol.readIdentifiable(OChannelBinaryProtocol.java:121)

at com.orientechnologies.orient.client.remote.OStorageRemote.command(OStorageRemote.java:1023)

... 4 more

Caused by: java.lang.IllegalArgumentException: Record type '0' is not supported

at com.orientechnologies.orient.core.record.ORecordFactoryManager.getFactory(ORecordFactoryManager.java:108)

at com.orientechnologies.orient.core.record.ORecordFactoryManager.newInstance(ORecordFactoryManager.java:91)

... 6 more

代码：

OGremlinHelper.global().create();

ScriptEngine engine = new GremlinGroovyScriptEngineFactory().getScriptEngine();

engine.getBindings(ScriptContext.ENGINE_SCOPE).put("g", graph);

OCommandGremlin command = new OCommandGremlin(" ...... ");

Map<String, Object> params = new HashMap<String, Object>();

List agg1 = graph.getRawGraph().command(command).execute(params);

System.out.println("Result:-- " + agg1);