Morphia is an open source lightweight type-safe library designed to bridge the gap between the MongoDB Java driver and domain objects. It can be an alternative to SpringData if you're not using the Spring Framework to interact with MongoDB.

What is Morphia in Java?

Morphia — MongoDB Object Document Mapping for the JVM.

Transparently map your Java entities to MongoDB documents and back. Extensible Type Conversion. Easily add support for custom types. Robust Query and Update APIs Full Aggregation Support. Use MongoDB's aggregation framework with your application's Java classes.

What is Mongojack?

Mongojack maps Java objects to MongoDB documents. Based on the Jackson JSON mapper, Mongojack allows you to easily handle your mongo objects as POJOs (insert, search by id or by any other field, update).