Spring error occurs when spring-security-xxx added?

I assume the ${spring-version} euqals 3.1.2.Release. If so, the problem here is due to spring security 3.1.2 does not utilize Spring-Core 3.1.2 as you may expect. This leads to two versions of Spring core to be existing on your classpath & then cause the exception.

For this reason, you have to explicit exlude the dependencies on Spring core of Spring Security in your pom. See search.maven.org/remotecontent?filepath=org/springframework/security/spring-security-core/3.1.2.RELEASE/spring-security-core-3.1.2.RELEASE.pom .

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