Javadoc jars can be download from Maven Central. For all new releases, the javadocs are included in the Neo4j manual and will not be published here. You can find them at http://neo4j.com/docs/stable/javadocs/ for the latest stable release – replace “stable” with an actual Neo4j version to see the corresponding javadocs for that version, for example http://neo4j.com/docs/2.0.4/javadocs/.