Name or service not known in java RestHighLevelClient

Elastic Stack Elasticsearch
1

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 :

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:

    @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:

spring:
  elasticsearch:
    uris: 127.0.0.1:9200
    username: elastic
    password: 123123123123

Thank you

2

I think that this is wrong:

new HttpHost("http://" + elasticsearchProperties.getUris().get(0))
                    )

Try something like:

HttpHost.create(elasticsearchServiceAddress)
1 Like
3

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

new HttpHost(hostname, port, scheme)

Thank you again.

4

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