How can I store references to Java objects in Neo4j?

How can I store references to Java objects in 开发者_JAVA技巧Neo4j?

Neo4j basically stores primitives like integers and strings. See the full reference on what can be stored in the apidocs for setProperty.

I managed to store objects into neo4j by first marshaling them to an XML (I'm using Xstream for that) and then unmarshaling when querying.