# Custom JanusGraph type handler

It registers `janusgraph.RelationIdentifier` generated by JanusGraph when trying to 
do `path().by(elementMap())` which is raising a Serialization error.

Linked to issues:
* https://issues.apache.org/jira/browse/TINKERPOP-2802
* https://issues.apache.org/jira/browse/TINKERPOP-2828