Invocation Handler does not modify object array?

I have used Invocation handler for reflection. and in findApiKeys method, I am trying to modify the value of args array. but its not changing the value. its giving me same value.

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            String apiKey = findApiKey(args);
            if (cache.get(method.getName()) != null) {
                ServicesCacheKey cacheKey = new ServicesCacheKey();
                Map<String, Object> parameters = new HashMap<>();
                cacheKey.setApiKey(apiKey);
                parameters.put(PARAMETERS_KEY, args[0]);
                cacheKey.setParameters(parameters);
                return cache.get(method.getName()).get(cacheKey);
            } else if (multiMap.get(method.getName()) != null) {
                Set<ServicesCacheKey> servicesCacheKeys = getCacheKeySetFromArgList((Set<Object>) args[0], apiKey);
                Map<ServicesCacheKey, Object> result = multiMap.get(method.getName()).getAll(servicesCacheKeys);
                return getResultMapFromCacheKeyMap(result);
            } else {
                return i1.invoke(proxy, method, args);    // **problem here**
            }
        }

private String findApiKey(Object[] args) {
    for (int i = 0; i < args.length; i++) {
        Object arg = args[i];
        if (arg instanceof String) {
            String k = (String) arg;
            int index = k.indexOf("apiKey~~");
            if (index != -1) {
                String apiKey = k.substring(index + "apiKey~~".length());
                args[i] = apiKey;
                return apiKey;
            }
        }
    }
    throw new IllegalArgumentException("Api Key must not be empty");
}

stacktrace :

2016-08-24 03:54:33,849 [vli13:39922] [P7000] ERROR arch.service.thrift.SearchImpl - Invalid Request to dependencies services: null, Reason: Provided API key {apiKey~~solr} is not authorized to access experiment service. Please talk to service administrator to obtain a valid api key

Same code is working without reflection api

example:

public static void main(String[] args) throws InterruptedException {
    Object[] argss = new Object[] {"Pankaj", "api~~solr"};
    findApiKey(args);
    System.out.println(argss[0] + " " + argss[1]);
}

output : pankaj solr