How to securing methods with spring and MVVM pattern?

public class TestViewModel{
		@Init
		public void Init(){
			String idStr = (String) Executions.getCurrent().getArg().get("id");
			Long id = StringUtils.isNotEmpty(idStr) ? Long.valueOf(idStr) : null;
			initialize(id);
		}
		public void initialize(Long id){
			//It retrieves object from bbdd
		}
	}

<sec:global-method-security authentication-manager-ref="authenticationManager" pre-post-annotations="enabled"  proxy-target-class="true">
		<sec:expression-handler ref="expressionHandler"/>
	</sec:global-method-security>

@PreAuthorize("hasRole('ROLE_USER')")
        @Init
	public void Init(){
		String idStr = (String) Executions.getCurrent().getArg().get("id");
		Long id = StringUtils.isNotEmpty(idStr) ? Long.valueOf(idStr) : null;
		initialize(id);
	}