DataNucleus

Developers for whom data retrieval and persistence are necessary might be on the lookout for a software solution that would provide such features.
DataNucleus’s AccessPlatform offers precisely such features, enabling users to benefit from persistence and retrieval of data for a range of datastores, using a wide variety of APIs, with several similar languages.
It supports the following datastores: RDBMS, Neo4j, LDAP, Excel (XLS/OOXML), XML, NeoDatis, JSON, ODF, HBase, Amazon S3, GoogleStorage, MongoDB, Cassandra, etc.
Featuring an open source code, it is compliant with all JDO and JPA specifications, providing all mandatory items and the majority of optimal items and value-added extensions.
Being deployed as an archive, it also comes in versions that can be used as plug-ins for the Maven or Eclipse programming environments.
Each of the provided plug-ins are OSGi bundles with a different level of functionality in the overall DataNucleus platform.
Users will be able to select their preferred APIs and access a variety of datastores, thanks to compliance standards provided by DataNucleus.
Its Java data objects offer transparent persistence and datastore agnosticity, the Java persistence API provides easy persistence to RDBMS datastores and comes packed with its JPQL query language.
Finally, its REST API component is available for web-based applications where users need to request objects from a server and post object updates to the said servers, for later retrieval.System requirementsJava