Localhost:9200: nodename nor servname provided, or not known

sneup · June 18, 2019, 3:04am

I am running elastic search version 6.4 locally and my dependency for the spring boot application is implementation 'org.elasticsearch.client:elasticsearch-rest-high-level-client:6.4.0' . I am getting java.io.IOException: localhost:9200: nodename nor servname provided, or not known
at org.elasticsearch.client.RestClient$SyncResponseListener.get(RestClient.java:948)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:227)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:272)
.I tried localhost only also but still getting same problem. But when I am using same code but server elastic search I am getting having problem. Previously I am using elastic search transport. at that time there was no problem while connection but i upgrade to rest-high-level client ..I am facing problem ... Can some one help me.....

dadoonet · June 18, 2019, 5:05am

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sneup · June 18, 2019, 12:32pm

This is my elastic configuration class:

@Bean(destroyMethod = "close")
    public RestHighLevelClient client() {

        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost(elasticHost)));
        return client;

    }

and in my service class I am trying to check index is already exist or not using

public boolean checkIfIndexExists(String indexName) throws IOException {
        Response response = client.getLowLevelClient().performRequest("HEAD", "/" + indexName);
        int statusCode = response.getStatusLine().getStatusCode();
        return (statusCode != 404);
    }

Where same code is working on the server but not in the local.. where in local I am using elastic 6.4.2 and maven also the same version.

dadoonet · June 18, 2019, 1:34pm

Can you print debug the content of elasticHost?

sneup · June 18, 2019, 2:09pm

Hi Dadoonet,
My elasticHost is localhost:9200.. which I am reading from YML

dadoonet · June 18, 2019, 2:11pm

Can you replace it with an IP address like 127.0.0.1?

sneup · June 18, 2019, 2:20pm

Yes I tried but still having same problem. previously when i use elastic transport (with transport code) it was working perfectly on the localhost:9200 port. But after changing with the above configuration for highlevel client I am facing problem on my local machine.

dadoonet · June 18, 2019, 4:27pm

Could you try this?

github.com

dadoonet/legacy-search/blob/01-direct/src/main/java/fr/pilato/demo/legacysearch/dao/ElasticsearchDao.java#L49


import java.io.IOException;


@Component
public class ElasticsearchDao {
    private final Logger logger = LoggerFactory.getLogger(ElasticsearchDao.class);


    private final ObjectMapper mapper;
    private final RestHighLevelClient esClient;


    public ElasticsearchDao(ObjectMapper mapper) {
        this.esClient = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://127.0.0.1:9200")));
        this.mapper = mapper;
    }


    public void save(Person person) throws IOException {
        byte[] bytes = mapper.writeValueAsBytes(person);
        esClient.index(new IndexRequest("person").id(person.idAsString()).source(bytes, XContentType.JSON), RequestOptions.DEFAULT);
    }


    public void delete(String id) throws IOException {
        esClient.delete(new DeleteRequest("person", id), RequestOptions.DEFAULT);

I mean manually set the IP like:

new RestHighLevelClient(RestClient.builder(HttpHost.create("http://127.0.0.1:9200")));

sneup · June 18, 2019, 5:33pm

Thank you for the response dodoonet. Still having the same problem. .. when I use the hardcoded value(HttpHost.create("http://127.0.0.1:9200")) in configuration file getting this image error.

But when I use restclient in the inline (as you suggested) I am able to connect to the localhost. that means it is successfully why ? But for the server connection I dont have to do that..

client = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://127.0.0.1:9200")));
        Response response = client.getLowLevelClient().performRequest("HEAD", "/" + indexName);
        int statusCode = response.getStatusLine().getStatusCode();

dadoonet · June 20, 2019, 1:25pm

So when you read from a config file it does not work right?

pokaleshrey · June 20, 2019, 1:37pm

Did you try using below while creating RestClient:

new HttpHost("localhost", 9200, "http")

instead of

HttpHost.create("http://127.0.0.1:9200")

This works for us in local and on server and everywhere.

sneup · June 21, 2019, 4:09pm

Actually No @dadoonet , If that happens it should not get the value in the above screenshot. You see in the above image the value is coming from the config file.

dadoonet · June 21, 2019, 5:10pm

But you said you are successful in one case. Which one is it?

sneup · June 21, 2019, 8:14pm

I said When I create a bean and @autowired that bean is not working for localhost/9200. But the same code with server elastic(AWS) search is working. And for the localhost if I write the code inside the same method like this

client = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://127.0.0.1:9200")));

it is working. I am confuse why the localhost is not working while autowire the configuration class.

my configuration class is

@Configuration
public class ElasticsearchConfig {

@Bean(destroyMethod = "close")
public RestHighLevelClient client() {

    RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(new HttpHost("http://127.0.0.1:9200")));
    return client;

}

}

sneup · June 21, 2019, 8:23pm

Thank you This way its working for localhost also!!!!

dadoonet · June 22, 2019, 2:56am

So is it solved?

system · July 20, 2019, 2:56am

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