Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping.  Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping. Hibernate lets you develop persistent classes following natural Object-oriented idioms including inheritance, polymorphism, association, composition. <BR><BR> It supports Oracle, DB2, MySQL, PostgreSQL, Sybase, Interbase, Microsoft SQL Server, Progress, SAP DB, and HypersonicSQL. It also provides support to do text search and Shard (horizontal partition) the database.
  <UL>
	<LI>Transparent Persistence</LI>
	<LI>High Performance</LI>
	<LI>Reliability and Scalability</LI>
	<LI>Extensibility: Hibernate is highly customizable and extensible. </LI>
	<LI>Support for Hibernate Query Language (HQL)</LI>
 </UL>

Hibernate facilitated the storage and retrieval of domain objects via Object/Relational Mapping.  Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping.

Hibernate - Relational Persistence for Java

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.
<BR>
Although there are various excellent ORM frameworks for relational databases, data modeling in NoSQL data stores differ profoundly from their relational cousins. Moreover, data-model agnostic frameworks such as JDO are not sufficient for use cases, where one needs to use the full power of the data models in column stores. Gora fills this gap by giving the user an easy-to-use in-memory data model and persistence for big data framework with data store specific mappings and built in Apache Hadoop support.

The Apache Gora open source framework provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support.

Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

Norm is a simple way to access a JDBC database, usually in one line of code. It purges your code of the complex mess that is Hibernate, JPA, and ORM. It is an extremely lightweight layer over JDBC. It gets rid of large amounts of boilerplate JDBC code. 

norm - Not Object-Relational Mapping

Cayenne is a Java object relational mapping (ORM) framework. Cayenne seamlessly binds one or more database schemas directly to Java objects, managing atomic commit and rollbacks, SQL generation, joins, sequences, and more. With Cayenne's Remote Object Persistence, those Java objects can even be persisted out to clients via Web Services. 
<BR>
Cayenne supports numerous other features, including caching, a complete object query syntax, relationship pre-fetching, on-demand object and relationship faulting, object inheritance, database auto-detection, and generic persisted objects.

Cayenne is a Java object relational mapping (ORM) framework. Cayenne seamlessly binds one or more database schemas directly to Java objects, managing atomic commit and rollbacks, SQL generation, joins, sequences, and more. With Cayenne's Remote Object Persistence, those Java objects can even be persisted out to clients via Web Services. 

Apache Cayenne - User-friendly Java ORM with tools

Object Relational Mapping Lite (ORM Lite) provides some simple, lightweight functionality for persisting Java objects to SQL databases while avoiding the complexity and overhead of more standard ORM packages. 

OrmLite - A lightweight ORM for Java

Apache OpenJPA is a Java persistence project at The Apache Software Foundation that can be used as a stand-alone POJO persistence layer or integrated into any Java EE compliant container and many other lightweight frameworks, such as Tomcat and Spring. 

Apache OpenJPA - Java Persistence API Implementation

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Hibernate - Relational Persistence for Java

Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

norm - Not Object-Relational Mapping

Apache Cayenne - User-friendly Java ORM with tools

OrmLite - A lightweight ORM for Java

Apache OpenJPA - Java Persistence API Implementation

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Hibernate - Relational Persistence for Java

Apache Gora - Provides persistence to column stores, key value stores, document stores and RDBMS

norm - Not Object-Relational Mapping

Apache Cayenne - User-friendly Java ORM with tools

OrmLite - A lightweight ORM for Java

Apache OpenJPA - Java Persistence API Implementation

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