SchemaViolationException while creating a new janus cluster

Question

I am trying to create a janusgraph cluster with cassandra as backend and elastic for indexing. Getting a warning saying -

org.janusgraph.core.SchemaViolationException: Adding this property for key [~T$SchemaName] and value [rtusername] violates a uniqueness constraint [SystemIndex#~T$SchemaName]

followed by a error saying

ERROR org.apache.tinkerpop.gremlin.server.GremlinServer  - Gremlin Server Error
java.lang.IllegalStateException: Could not create/configure Authenticator null  

Can someone please help me understand what I am missing here? What does rtusername actually mean here

Answer 1

Things to check for the first error message:

• is an old graph with the same value for the keyspace present (beware for the default value "janusgraph")?
• was the property key added by a different gremlin client (check by printing the schema, before adding the property key)?
• are you sure this happens during adding the property key to the schema (because this error can also happen while adding a property to a vertex of the graph)

The second error message is related to the communication between your gremlin client and the JanusGraph Server. Things to check:

• do the TinkerPop versions of the gremlin client and the JanusGraph Server match (compatibility matrix)?