Spring Security 2.0.0 版本在4月15号发布不久，Spring Security开发小组紧接着发布了2.0.1版本
该版本主要是修改前一版本的缺陷为主，但也提供了OSGi相关方面的一些功能提升,扩展的命名空间配置支持和
使用增强的加密令牌功能。
官方网址:
Spring Security
下面是官方发布声明：
Spring Security 2.0.1 provides a number of fixes to the recent 2.0.0 release.
It also offers some further improvements in relation to OSGi support,
extended namespace configuration, and cryptographically-strong token generation.
It is entirely backward compatible with 2.0.0 and can be used as a drop-in JAR replacement.