@Cacheable annotations not available in STS 2.6.1 for Spring 3.1.0.M1

I am unable to use the annotations found in the org.springframework.cache.annotations package such as @Cacheable? Given that the spring-context-3.1.0.M1.jar is in the classpath and listed in the Maven Dependencies, I should be able to mark up my source code with these annotations, correct?

I am using STS 2.6.1.

I know that true 3.1.0.M1 support is not available in STS yet, but these are just annotations and not sure why they would not be able to be used.

Please ignore my post as it was my own fault having an older version of the project with the same class name being edited!!!