Hibernate 5.2.2发布

Hibernate 5.2.2 发布了，Hibernate是一种Java语言下的对象关系映射解决方案。 它是使用GNU宽通用公共许可证发行的自由、开源的软件。它为面向对象的领域模型到传统的关系型数据库的映射，提供了一个使用方便的框架。

一些新特性：

    * [HHH-10965] - Add new Query Hint to avoid passing DISTINCT from entity queries to SQL statements
    * [HHH-10966] - Document @DiscriminatorValue NULL and NOT_NULL options
    * [HHH-10971] - Document flush operation order

一些提升：

    * [HHH-8687] - Better exception message for PostgreSQL81Dialect and named REF_CURSOR parameter binding
    * [HHH-10531] - JaxbHbmTuplizerType marshalling does not conform hibernate-mapping-4.0.xsd
    * [HHH-10532] - Cannot marshall JaxbHbmBasicAttributeType to xml if the "generated" attribute is not specified
    * [HHH-10800] - InformixDialect: add support for coalesce(), current_timestamp(), current_date()
    * [HHH-10905] - NullPointerException when StatelessSession.get(Class, Serializable, LockMode) called with null LockMode, instead of defaulting to LockMode.NONE
    * [HHH-10923] - Upgrade CDI 1.1 and related dependencies to Final
    * [HHH-10924] - Replace ConcurrentServiceBinding by ConcurrentHashMap
    * [HHH-10943] - Driver Manager Connection Pool should close leaked connections upon shutting down
    * [HHH-10945] - Move TransactionUtil from documentation to hibernate-testing
    * [HHH-10946] - Add utility to detect connection leaks during testing
    * [HHH-10947] - Add @Repeatable to Hibernate-owned annotations
    * [HHH-10949] - Upgrade Infinispan to 8.2.3.Final
    * [HHH-10984] - Have multiLoad not return (unflushed) DELETED entities
    * [HHH-10996] - The cleanupTestData utility has issues with link tables
    * [HHH-11000] - Fix the port stealing issue between Arquillian and NVidia Windows driver
    * [HHH-11002] - Add documentation section about Filter and FilterDef
    * [HHH-11017] - Migrate Integration Guide to AsciiDoctor

更多改进信息，可查看完整改进日志。