Hibernate 4.2.21发布，Java的ORM框架

Hibernate 4.2.21 发布了，该版本主要是 Bug 修复，包括：

Bug

    [HHH-5255] - Merge detached entity failed when the instrumented lazy property is initialized
    [HHH-7573] - Lazy properties are not processed properly after a PreUpdate callback
    [HHH-9928] - Pending put leaks when the entity is not found in DB
    [HHH-10182] - Backport HHH-7898 and HHH-10005 for JTA environment only