# Could not initialize class org.elasticsearch.threadpool.ThreadPool

**URL:** <https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-threadpool-threadpool/47575>\
**Category:** Elasticsearch\
**Created:** [April 17, 2016, 7:50am UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-threadpool-threadpool/47575 "2016-04-17T07:50:26Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![cynosureabu](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cynosureabu/32/47196_2.png) [@cynosureabu](https://discuss.elastic.co/u/cynosureabu)\
**Post date:** [April 17, 2016, 7:50am UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-threadpool-threadpool/47575/1 "2016-04-17T07:50:26Z")

</div>

I am upgrading the elasticsearch version from 1.\* to 2.1.1. I am using it in a storm topology:

```auto
<dependency>
	<groupId>org.elasticsearch</groupId>
	<artifactId>elasticsearch</artifactId>
	<version>2.1.1</version>
</dependency>

```

java version "1.8.0\_45"  
I am using shade plugin. the following code failed with NoClassDef exception:

```
Settings settings = Settings.settingsBuilder().put("cluster.name", elasticSearchCluster)
				.put("client.transport.ping_timeout", this.clientTimeout).build();
		TransportClient transportClient = TransportClient.builder().settings(settings).build();

```

```auto
java.lang.NoClassDefFoundError: Could not initialize class org.elasticsearch.threadpool.ThreadPool
	at org.elasticsearch.client.transport.TransportClient$Builder.build(TransportClient.java:130)

```

What I am missing here?

Thanks,  
Chen

---

<div class="post-metadata">

**Author:** ![cynosureabu](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cynosureabu/32/47196_2.png) [@cynosureabu](https://discuss.elastic.co/u/cynosureabu)\
**Post date:** [April 17, 2016, 7:59am UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-threadpool-threadpool/47575/2 "2016-04-17T07:59:39Z")

</div>

It seems missing guava dependency. After adding guava dependency, the error disappeared.

```auto
<dependency>
	<groupId>com.google.guava</groupId>
	<artifactId>guava</artifactId>
	<version>19.0</version>
</dependency>

```

---

<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:** [July 5, 2017, 10:58pm UTC](https://discuss.elastic.co/t/could-not-initialize-class-org-elasticsearch-threadpool-threadpool/47575/3 "2017-07-05T22:58:43Z")

</div>