core/src/main/java/org/springframework/security/access/expression/method/DefaultMethodSecurityExpressionHandler.java
public StandardEvaluationContext createEvaluationContextInternal(Authentication auth,
			MethodInvocation mi) {
		return new MethodSecurityEvaluationContext(auth, mi, getParameterNameDiscoverer());
	}
public StandardEvaluationContext createEvaluationContextInternal(Authentication auth,
			MethodInvocation mi) {
		return new MethodSecurityEvaluationContext(auth, mi, getParameterNameDiscoverer());
	}
Uses a {@link MethodSecurityEvaluationContext} as the <tt>EvaluationContext</tt>
implementation.