I just down loaded the 3.1.2 release of spring-security from Maven central and tried to use it in a JDK 1.5 project. But I am getting the following error:

Caused by: java.lang.UnsupportedClassVersionError: (org/springframework/security/web/FilterChainProxy) bad major version at offset=6

I thought this was supposed to be fixed in 3.1.2?