We faced below NPE with JG 0.6.0 while creating new vertex. Not sure if this is related but never seen this exception with earlier JG versions.
java.lang.NullPointerException: null
at org.janusgraph.graphdb.types.VertexLabelVertex.isPartitioned(VertexLabelVertex.java:41) ~[janusgraph-core-0.6.0.jar:?]
at org.janusgraph.graphdb.types.VertexLabelVertex.hasDefaultConfiguration(VertexLabelVertex.java:67) ~[janusgraph-core-0.6.0.jar:?]
at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.addVertex(StandardJanusGraphTx.java:579) ~[janusgraph-core-0.6.0.jar:?]
at org.janusgraph.graphdb.tinkerpop.JanusGraphBlueprintsTransaction.addVertex(JanusGraphBlueprintsTransaction.java:127) ~[janusgraph-core-0.6.0.jar:?]
at org.janusgraph.graphdb.tinkerpop.JanusGraphBlueprintsGraph.addVertex(JanusGraphBlueprintsGraph.java:143) ~[janusgraph-core-0.6.0.jar:?]
