Spring

The Spring Framework is a Java application framework that is free source.

Spring is a non-intrusive, adaptable, and robust framework.

The Spring framework extends the Java EE APIs but does not replace them. It eliminates the majority of boilerplate code, easing the strain on developers.

Spring provides services and functionalities across the application domain, such as a core Inversion of Control container, technology-agnostic data-access and MVC layers, extensive AOP support, task scheduling, and various integration patterns designed to simplify and clarify distributed system development. While some Spring modules are only wrappers and aids for the Java EE requirements, the vast majority of them go much beyond the Java EE guidelines.