ORM tools/framework regarding mongodb for Java

There are some. Start reading:

http://www.mongodb.org/display/DOCS/Java+Language+Center

As for maven support, just look up libraries in mvnrepository.com ( most of them will be there )

This is what you need: http://www.infoq.com/articles/mongodb-java-orm-bcd It is maven-based.

See this presenation on slide share http://www.slideshare.net/mongodb/java-persistence-frameworks-for-mongodb