# Name or service not known in java RestHighLevelClient **URL:** \ **Category:** Elasticsearch\ **Tags:** language-clients\ **Created:** [August 23, 2023, 2:12am UTC](https://discuss.elastic.co/t/name-or-service-not-known-in-java-resthighlevelclient/341415 "2023-08-23T02:12:57Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![ChiMu\_Yuan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chimu_yuan/32/123166_2.png) [@ChiMu\_Yuan](https://discuss.elastic.co/u/ChiMu_Yuan)\ **Post date:** [August 23, 2023, 2:12am UTC](https://discuss.elastic.co/t/name-or-service-not-known-in-java-resthighlevelclient/341415/1 "2023-08-23T02:12:57Z")
Hi, everyone. I am using the `Elasticsearch High Level REST client` to access the service, but I am getting an error `Name or service not known`. However, I can successfully access the service using curl. Since I upgraded from an older version to 7.17 and I am using the Rest High Client as a transitional solution, I'm encountering this strange issue and I'm unsure how to resolve it. Thank you JDK 17 SpringBoot 3.1.2 elasticsearch 7.17.12 elasticsearch-rest-high-level-client 7.17.12 error : ```auto java.net.UnknownHostException: http://127.0.0.1:9200: Name or service not known at java.base/java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) ~[na:na] at java.base/java.net.InetAddress$PlatformNameService.lookupAllHostAddr(InetAddress.java:934) ~[na:na] at java.base/java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1543) ~[na:na] at java.base/java.net.InetAddress$NameServiceAddresses.get(InetAddress.java:852) ~[na:na] at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1533) ~[na:na] at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1385) ~[na:na] at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1306) ~[na:na] at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[httpclient-4.5.13.jar!/:4.5.13] at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:666) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:637) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequest(AbstractNIOConnPool.java:472) ~[httpcore-nio-4.4.16.jar!/:4.4.16] at org.apache.http.nio.pool.AbstractNIOConnPool.lease(AbstractNIOConnPool.java:280) ~[httpcore-nio-4.4.16.jar!/:4.4.16] at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.requestConnection(PoolingNHttpClientConnectionManager.java:295) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.requestConnection(AbstractClientExchangeHandler.java:381) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.start(DefaultClientExchangeHandlerImpl.java:130) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.execute(CloseableHttpAsyncClientBase.java:116) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:138) ~[httpasyncclient-4.1.5.jar!/:4.1.5] at org.elasticsearch.client.RestClient.lambda$performRequestAsync$0(RestClient.java:393) ~[elasticsearch-rest-client-8.7.1.jar!/:8.7.1] at org.elasticsearch.client.Cancellable$RequestCancellable.runIfNotCancelled(Cancellable.java:90) ~[elasticsearch-rest-client-8.7.1.jar!/:8.7.1] at org.elasticsearch.client.RestClient.performRequestAsync(RestClient.java:391) ~[elasticsearch-rest-client-8.7.1.jar!/:8.7.1] at org.elasticsearch.client.RestClient.performRequestAsync(RestClient.java:378) ~[elasticsearch-rest-client-8.7.1.jar!/:8.7.1] at org.elasticsearch.client.RestHighLevelClient.getVersionValidationFuture(RestHighLevelClient.java:2735) ~[elasticsearch-rest-high-level-client-7.17.12.jar!/:8.7.1] at org.elasticsearch.client.RestHighLevelClient.performClientRequest(RestHighLevelClient.java:2692) ~[elasticsearch-rest-high-level-client-7.17.12.jar!/:8.7.1] .......... ``` java config: ```auto @Autowired private ElasticsearchProperties elasticsearchProperties; @Bean public RestHighLevelClient restHighLevelClient() { final CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials( AuthScope.ANY, new UsernamePasswordCredentials( elasticsearchProperties.getUsername(), elasticsearchProperties.getPassword() ) ); return new RestHighLevelClient( RestClient.builder( new HttpHost("http://" + elasticsearchProperties.getUris().get(0)) ) .setHttpClientConfigCallback( httpAsyncClientBuilder -> httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider) ) ); } ``` application.yml: ```auto spring: elasticsearch: uris: 127.0.0.1:9200 username: elastic password: 123123123123 ``` Thank you ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [August 23, 2023, 10:50am UTC](https://discuss.elastic.co/t/name-or-service-not-known-in-java-resthighlevelclient/341415/2 "2023-08-23T10:50:06Z")
I think that this is wrong: ``` new HttpHost("http://" + elasticsearchProperties.getUris().get(0)) ) ``` Try something like: ``` HttpHost.create(elasticsearchServiceAddress) ``` ---
**Author:** ![ChiMu\_Yuan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chimu_yuan/32/123166_2.png) [@ChiMu\_Yuan](https://discuss.elastic.co/u/ChiMu_Yuan)\ **Post date:** [August 24, 2023, 3:52am UTC](https://discuss.elastic.co/t/name-or-service-not-known-in-java-resthighlevelclient/341415/3 "2023-08-24T03:52:37Z")
yep, lol This is an careless mistake, my fault. I thought that by providing the complete URL to `HttpHost` , it would help me split out the scheme, port, and hostname. However, upon examining the source code, it appears that only the hostname is being extracted. The correct way is ```auto new HttpHost(hostname, port, scheme) ``` Thank you again. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [September 21, 2023, 3:52am UTC](https://discuss.elastic.co/t/name-or-service-not-known-in-java-resthighlevelclient/341415/4 "2023-09-21T03:52:40Z")
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