# Error when using Java REST Client in Android Studio
**URL:** https://discuss.elastic.co/t/error-when-using-java-rest-client-in-android-studio/180904
**Category:** Elasticsearch
**Created:** [May 14, 2019, 1:39am UTC](https://discuss.elastic.co/t/error-when-using-java-rest-client-in-android-studio/180904 "2019-05-14T01:39:31Z")
**Posts on this page:** 4
**Page:** 1
Hello,
I'm trying your Java REST client API in Android Studio.
But i have this error
> Caused by: java.lang.NoSuchFieldError: No field INSTANCE of type Lorg/apache/http/message/BasicLineFormatter; in class Lorg/apache/http/message/BasicLineFormatter;
Impossible to find a solution...
I try to exclude httpclient module in my gradle file,
> implementation ('org.elasticsearch.client:elasticsearch-rest-client:7.0.1'){
> exclude module: 'httpclient'
> exclude module: 'httpcore-nio'
> exclude module: 'httpcore'
> }
But nothing, it doesn't work.
Could you help me, please !
Thanks
---
I did not find a solution despite hours of research. Too bad the support is not more active. I took the solution with an AsyncHttpClient object
public class DAOElastic extends JsonHttpResponseHandler{
private String URL;
private AsyncHttpClient client ;
private boolean error;
```
public DAOElastic(){
this.URL = "http://192.168.1.154:9200/";
this.client = new AsyncHttpClient();
this.error = false;
}
public void get(String url, RequestParams params) {
this.client.get((this.URL+url), params, this);
}
public void post(String url, RequestParams params) {
this.client.post((this.URL+url), params, this);
}
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
// If the response is JSONObject instead of expected JSONArray
this.error = false;
this.deserialiseMedicaments(response);
}
@Override
public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
//Log.i(CLASS_NAME, "onSuccess: " + response.toString());
}
@Override
public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
super.onFailure(statusCode, headers, responseString, throwable);
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
this.error = true;
}
@Override
public void onRetry(int retryNo) {
Log.i("Test", "onRetry " + retryNo);
// called when request is retried
}
@Override
public ArrayList