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尝试在 OrientDB 2.2.12 上创建抽象顶点类型我获得以下异常。该代码适用于 OrientDB 2.2.0

Exception in thread "main" com.orientechnologies.orient.core.exception.OSecurityException: Class 'MyVertexType' cannot be truncated because has record level security enabled (extends 'ORestricted')
    DB name="mydb"
    DB name="mydb"
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.orientechnologies.orient.client.binary.OChannelBinaryAsynchClient.throwSerializedException(OChannelBinaryAsynchClient.java:437)
    at com.orientechnologies.orient.client.binary.OChannelBinaryAsynchClient.handleStatus(OChannelBinaryAsynchClient.java:388)
    at com.orientechnologies.orient.client.binary.OChannelBinaryAsynchClient.beginResponse(OChannelBinaryAsynchClient.java:270)
    at com.orientechnologies.orient.client.binary.OChannelBinaryAsynchClient.beginResponse(OChannelBinaryAsynchClient.java:162)
    at com.orientechnologies.orient.client.remote.OStorageRemote.beginResponse(OStorageRemote.java:2138)
    at com.orientechnologies.orient.client.remote.OStorageRemote$27.execute(OStorageRemote.java:1160)
    at com.orientechnologies.orient.client.remote.OStorageRemote$2.execute(OStorageRemote.java:196)
    at com.orientechnologies.orient.client.remote.OStorageRemote.baseNetworkOperation(OStorageRemote.java:235)
    at com.orientechnologies.orient.client.remote.OStorageRemote.networkOperationRetry(OStorageRemote.java:193)
    at com.orientechnologies.orient.client.remote.OStorageRemote.networkOperation(OStorageRemote.java:204)
    at com.orientechnologies.orient.client.remote.OStorageRemote.command(OStorageRemote.java:1136)
    at com.orientechnologies.orient.core.command.OCommandRequestTextAbstract.execute(OCommandRequestTextAbstract.java:69)
    at com.orientechnologies.orient.core.metadata.schema.OClassImpl.setAbstract(OClassImpl.java:1369)
    at com.orientechnologies.orient.core.metadata.schema.OClassAbstractDelegate.setAbstract(OClassAbstractDelegate.java:63)
    at com.acme.Test.main(Test.java:68)

您可以在https://github.com/lucafrosini/test-orientdb-2-2-12找到重现此行为的完整项目

通过调试发现原因是：

Caused by: com.orientechnologies.orient.core.exception.ODatabaseException:  Impossible to remove the last cluster of class 'Entity' drop the class instead
    DB name="mydb"
    DB name="mydb"
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