Check that you have that dependency in ur pom file:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>x.x.x.RELEASE</version>
</dependency>
(x.x.x : to be modified)
if you aren't using maven :
check the jar "spring-context-x.x.x.RELEASE.jar
" into your build path