EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly

Hibernate's Jakarta Validation reference implementation.

Maven plugin for generating OSGi service descriptors based on annotations.

Spring Object/Relational Mapping which provides integration layers for popular object-relational mapping APIs, including JPA, JDO, and Hibernate.

Kafka client library for building producers and consumers that interact with Apache Kafka clusters for high-throughput distributed messaging.

Core libraries for Apache Spark, a unified analytics engine for large-scale data processing.

Tools to assist in the reading of configuration/preferences files in various formats.

Core classes for Apache Camel, an Open Source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.

Utilities for Protocol Buffers

Core utilities and abstractions shared across Netty modules, including buffers, threading, and platform detection.

The core bundle which includes all core features of kernel Eg : (Deployment Framework, Logging Framework, Transport Framework, etc)