How i can change method annotations value in RunTime?

I have controller like

@MessageMapping("/room.register")
@SendTo("#{sendTo}")
public Message addUser(@Payload Message message,
                       SimpMessageHeaderAccessor headerAccessor) {
    headerAccessor.getSessionAttributes().put("username", 
    message.getSender());
    return message;

}

And i want to change value of SendTo annotation in runtime.

I tried to do it as follows:

@Aspect
public class SendToAspect {
@Autowired
private WebSocketConfigurationProperties webSocketConfigurationProperties;


@Around("execution (public * *(..)) && @annotation(ann)")
public Object execute(final ProceedingJoinPoint point, final SendTo ann) 
throws Throwable {

    MethodSignature signature = (MethodSignature) point.getSignature();
    Method method = signature.getMethod();
    method.setAccessible(true);

    Annotation[] annotations = method.getDeclaredAnnotations();
    for (int i = 0; i < annotations.length; i++) {
        if (annotations[i].annotationType().equals(SendTo.class)) {
            annotations[i] = new SendTo() {

                @Override
                public Class<? extends Annotation> annotationType() {
                    return SendTo.class;
                }

                @Override
                public String[] value() {
                    return new String[] 
                            {webSocketConfigurationProperties.getTopic()};
                }
            };
        }
    }
    return point.proceed();
}

}

but this only changes in the annotation array (Annotation[] annotations) and in the method annotations (method.getDeclaredAnnotations()) does not change.

Please tell me how to do this and is it possible at all?