DataNucleus Access Platform 是一个兼容各种标准的 Java 数据持久化框架，完全兼容 JDO1, JDO2, JDO2.1, JDO2.2, JDO2.3, 和 JPA1 等 Java 标准。提供一个基于 REST 的API。通过它可以访问所有常见的数据库服务器，还包括 LDAP, NeoDatis, JSON, Excel/ODF spreadsheets, XML, BigTable, 和 HADOOP 数据库等.
2.1.2 改进:
- Merge of JPA metadata has changed when specified in mixed annotations and XML.
- The PMF/EMF startup process has been fixed so that all persistence properties are respected.
- The use of positional parameters in JDOQL for RDBMS was fixed.
- Validation of candidate keys was fixed.
- Support for List.get in the JDOQL result clause was added.
- Creation of sequences with SchemaTool was fixed.
- Use of @Enumerated with a @Column in JPA was fixed.
- Runtime enhancement class loader problems were fixed
2.2M2 改进：
- 完全支持 JDO3.1 的列定位和初始支持序列控制
- The ability to retain the datastore connection when outside of a transaction was added.
- Support for use of methods in JDOQL grouping statements was added.
- Type comparison handling by the in-memory query evaluator was extended.
- The ability to skip validation of objects found in the L2 cache when invoked from PM.getObjectById/EM.find was added.
- Validation of candidate keys was fixed.
- Support for the use of maps with embedded keys/values and key in value was added.
- Many other additions and fixes
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