Weightless is the lowest barrier-to-entry database mapping library for the JVM. Weightless currently supports MongoDB. Learn more at weightlessorm.com.

Getting Started

Suppose we have a Person object we want to store in a Mongo database.

class Person {
  String name;
  int age;
}

With the Weightless library, the next class we will create is a PersonAccess interface. Note the method level and parameter level annotations.

interface PersonAccess {
  @Create
  void create(Person person);
  
  @Find
  Person findByName(@Field("name") @Equals String name);
}

Wait! We never have to implement this interface! Weightless has enough information to implement this class for us at runtime.

Weightless weightless = Weightless.mongo("mongodb://localhost:27017").database("mydatabase").build(); // Connect to a local MongoDB instance
PersonAccess personAccess = weightless.get(PersonAccess.class); // PersonAccess is implemented for us here

Person james = new Person("James", 30);
personAccess.create(james);

personAccess.findByName("James"); // { "name": "James", "age": 30 }

Installation

Install with maven:

<dependency>
  <groupId>com.jackhallam</groupId>
  <artifactId>weightless-orm</artifactId>
  <version>0.1.1-beta</version>
</dependency>

Is Weightless for Me?

Is Weightless a good fit for your project? Weightless is designed to help projects get connected to a database as quickly as possible. Weightless is highly opinionated; it gives developers fewer customization options, and in return it is extremely easy to use.

That being said, Weightless does not lock you in. Off-boarding when your project is mature enough to need a highly customized solution is very simple. You can still use the same database, and you can move one database table or collection away from Weightless' control at a time as needed.

Going Further

Visit weightlessorm.com for a more information with live examples.