DataNucleus AccessPlatform 4.0.0 M3 发布，此版本更新内容如下：
The bytecode enhancement contract was changed, meaning JPA users no longer need the JDO API jar to be present.
Support for multi-column type converters was added for Excel, ODF, and JSON datastores.
Schema evolution and query in-datastore support was added for Cassandra.
Support for JPA exclude-unlisted-classes was fixed.
EclipsePluginRegistry was dropped in favour of OSGiPluginRegistry.
Many other bugs were fixed and improvements were made
DataNucleus Access Platform 是一个兼容各种标准的 Java 数据持久化框架，兼容 JDO1, JDO2, JDO2.1, JDO2.2, JDO2.3, JPA1, JPA2 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.
项目主页：http://www.datanucleus.org/products/accessplatform/
下载地址：http://sourceforge.net/projects/datanucleus/
来自:开源中国社区
