HealthcareMetadata

var projectSchema = new Schema({ access: { type: String, enum: ACCESS_MODES, required: true, default: 'public' }, owner: { type: Schema.Types.ObjectId, ref: 'User' }] });

{ _id: ..., public: true, groups: ['group1', 'group2',...], users: ['user1','user2',...], } You could now query for all documents visible to user X if you have a list of groups user X belongs to by querying: db.documents.find( { $or : [ { public : true }, { users : X }, { groups : { $in : [list-of-X's-groups] } } ] } )

A tutorial on how to use RestEasy with MongoDB in order to create RESTful web services

There is however Morphia, an Object Document Mapper for MongoDB + Java which closely emulates the JPA model but using MongoDB appropriate semantics

DataNucleus already supports MongoDB, for JPA and JDO, the standardised APIs in Java.

clipseLink is planning support for MongoDB from JPA.