Spring Beans provides the configuration framework and basic functionality to instantiate, configure, and assemble java objects.

Spring Data makes it easy to use data access technologies, relational and non-relational databases, map-reduce frameworks, and cloud-based data services.

Spring Security

Spring Security

JMS support package, including helper classes to send/receive JMS messages

Spring Messaging provides abstractions such as Message, MessageChannel, MessageHandler, and others to serve as a foundation for messaging-based applications. It also includes a set of annotations for mapping messages to methods.

Spring Aspects integrates Spring with AspectJ.

Spring Data module for JPA repositories.

MongoDB support for Spring Data

Non-blocking web stack with support for 'Reactive Streams' back pressure, running on Netty, Undertow, and Servlet 3.1+ conts

Abstraction layer that supports Object/XML mapping implementations such as JAXB, Castor, XMLBeans, JiBX and XStream.