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|Stable release||11g Release 1 (18.104.22.168.0) / June 1, 2011|
|Platform||Java Virtual Machine|
In computing, TopLink is an object-relational mapping (ORM) package for Java developers. It provides a framework for storing Java objects in a relational database or for converting Java objects to XML documents.
The Object People company (that's the "TOP" in the Name) originally developed TopLink in Smalltalk in the 1990s. Between 1996 and 1998 a Java version of the product was created named TopLink for Java.
In 2006, Oracle donated source code from the TopLink product and development resources to the open-source Sun Microsystems java.net GlassFish project. It became the Java EE EJB 3.0 JPA reference implementation.
In March 2008 the Eclipse Foundation announced that Sun Microsystems had selected the EclipseLink project as the reference implementation for the JPA 2.0, JSR 317 standard. 
As well as functioning as an object-relational mapping tool, TopLink has other features including:
- query framework that supports an object-oriented expression framework, Query by Example (QBE), EJB QL, SQL, and stored procedures
- an object-level transaction framework
- caching to ensure object identity
- a set of direct and relational mappings
- object-to-XML mappings, in addition to JAXB support
- EIS/JCA support for non-relational datasources
- visual mapping editor (Mapping Workbench)
- limited support for query in memory
- Java Pro Readers' Choice Award for Best Java Data Access Tool or Driver (July 2003).
- Editor's Choice JavaWorld 2003 Award for Best Java Data Access Tool (2003).
- 4th-best Java persistence architecture (as voted by Java Developer's Journalreaders in 2004).
- A Brief History of TopLink by Donald Smith
- "Oracle Proposes Open Source Persistence Project at Eclipse Foundation". Oracle. March 6, 2008. Retrieved 2008-09-16.
- "Eclipse Announces EclipseLink Project to Deliver JPA 2.0 Reference Implementation". Eclipse Foundation. March 17, 2008. Retrieved 2008-09-16.
- Best Java Data Access Tool or Driver by Java Pro
- Best Java Data Access Tool by JavaWorld
- 4th best Java persistence architecture by Java Developer's Journal