EclipseLink

EclipseLink is a Java persistence framework developed by the Eclipse Foundation. It provides a standards-compliant implementation of the Java Persistence API (JPA) and is the continuation of Oracle's TopLink, released as open source and contributed to the Eclipse community in 2009. Since then, EclipseLink has evolved into a general-purpose persistence solution for Java applications, supporting relational data stores as well as NoSQL databases through an optional extension.

In addition to JPA, EclipseLink also implements the Java Data Objects (JDO) API and offers the EclipseLink NoSQL extension for mapping domain models to NoSQL data stores.

Key features include runtime weaving for lazy loading, powerful mapping capabilities (annotations or XML, embeddables, inheritance strategies), JPQL and Criteria API support, caching, fetch groups, batching, and support for multi-tenancy. It provides compatibility with a wide range of databases and can generate native SQL, execute native queries, and participate in transaction management under Java EE or Java SE environments.

EclipseLink is used in enterprise applications and integrates with common Java servers and tools. It reads configuration from persistence.xml files and can be embedded in standalone applications or deployed to application servers. The project is released under the Eclipse Public License.