# Unhandled java.lang.NoClassDefFoundError in Elasticsearch High-Level RestClientBuilder

**URL:** <https://discuss.elastic.co/t/unhandled-java-lang-noclassdeffounderror-in-elasticsearch-high-level-restclientbuilder/196013>\
**Category:** Elasticsearch\
**Created:** [August 20, 2019, 11:27pm UTC](https://discuss.elastic.co/t/unhandled-java-lang-noclassdeffounderror-in-elasticsearch-high-level-restclientbuilder/196013 "2019-08-20T23:27:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pavocristatus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pavocristatus/32/29378_2.png) [@pavocristatus](https://discuss.elastic.co/u/pavocristatus)\
**Post date:** [August 20, 2019, 11:27pm UTC](https://discuss.elastic.co/t/unhandled-java-lang-noclassdeffounderror-in-elasticsearch-high-level-restclientbuilder/196013/1 "2019-08-20T23:27:26Z")

</div>

Hi All,

I get the following error when running **"sbt test"** (scalatest with matchers) that helps with unit testing a method written in scala. The method creates an instance of Elasticsearch REST High-Level client followed by a SearchRequest query to the ES cluster. When I execute the unit test, I see the following error. To troubleshoot I did check for the jars in my classpath (sbt \> show test:full-classpath) and have the following jars available. Yet the ES connection to the cluster cannot be established to execute the search query.

- httpasyncclient-4.1.2.jar

- httpclient-4.5.3.jar

- httpcore-nio-4.4.5.jar

- Elasticsearch version: 6.2.3 (elasticsearch-rest-high-level-client-6.2.3.jar)

Unhandled java.lang.NoClassDefFoundError: Could not initialize class org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory

```
java.lang.NoClassDefFoundError: Could not initialize class org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingNHttpClientConnectionManager.java:553)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:163)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:147)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:119)
	at org.apache.http.impl.nio.client.HttpAsyncClientBuilder.build(HttpAsyncClientBuilder.java:668)
	at org.elasticsearch.client.RestClientBuilder$2.run(RestClientBuilder.java:218)
	at org.elasticsearch.client.RestClientBuilder$2.run(RestClientBuilder.java:215)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.elasticsearch.client.RestClientBuilder.createHttpClient(RestClientBuilder.java:215)
	at org.elasticsearch.client.RestClientBuilder.access$000(RestClientBuilder.java:42)
	at org.elasticsearch.client.RestClientBuilder$1.run(RestClientBuilder.java:187)
	at org.elasticsearch.client.RestClientBuilder$1.run(RestClientBuilder.java:184)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.elasticsearch.client.RestClientBuilder.build(RestClientBuilder.java:184)
	at org.elasticsearch.client.RestHighLevelClient.<init>(RestHighLevelClient.java:200)
	at org.elasticsearch.client.RestHighLevelClient.<init>(RestHighLevelClient.java:192)
        at xxxxxx.RestManager.<init>(RestManager.scala:28)

```

My rest high-level client scala code looks like the following:

```
  class RestManager extends Serializable {
    	val builder = RestClient.builder(
          new HttpHost("node1", 9200, "http"))
      builder.setRequestConfigCallback(new RequestConfigCallback() {
        override def customizeRequestConfig(requestConfigBuilder: RequestConfig.Builder) : RequestConfig.Builder =
        {
          requestConfigBuilder.setConnectTimeout(10000).setSocketTimeout(60000)
         }
   })
   .setMaxRetryTimeoutMillis(60000)
   val client: RestHighLevelClient = new RestHighLevelClient(builder)
   }

   object restClient extends RestManager
```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 17, 2019, 11:27pm UTC](https://discuss.elastic.co/t/unhandled-java-lang-noclassdeffounderror-in-elasticsearch-high-level-restclientbuilder/196013/2 "2019-09-17T23:27:35Z")

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