# Caused by: java.lang.NoClassDefFoundError: com/carrotsearch/hppc/BitMixer

**URL:** <https://discuss.elastic.co/t/caused-by-java-lang-noclassdeffounderror-com-carrotsearch-hppc-bitmixer/37530>\
**Category:** Elasticsearch\
**Created:** [December 18, 2015, 3:36am UTC](https://discuss.elastic.co/t/caused-by-java-lang-noclassdeffounderror-com-carrotsearch-hppc-bitmixer/37530 "2015-12-18T03:36:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Pradeep\_Gowda](https://avatars.discourse-cdn.com/v4/letter/p/ebca7d/32.png) [@Pradeep\_Gowda](https://discuss.elastic.co/u/Pradeep_Gowda)\
**Post date:** [December 18, 2015, 3:36am UTC](https://discuss.elastic.co/t/caused-by-java-lang-noclassdeffounderror-com-carrotsearch-hppc-bitmixer/37530/1 "2015-12-18T03:36:23Z")

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Hi All,  
Recently I upgraded my ES to 2.2.1. But I am getting below exception when I try to connect using java client. Did anyone come across same scenario?

```
 Caused by: java.lang.NoClassDefFoundError: com/carrotsearch/hppc/BitMixer
at org.elasticsearch.common.recycler.Recyclers$4.slot(Recyclers.java:176) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.recycler.Recyclers$4.getDelegate(Recyclers.java:185) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.recycler.FilterRecycler.obtain(FilterRecycler.java:39) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.cache.recycler.PageCacheRecycler.bytePage(PageCacheRecycler.java:150) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.util.BigArrays.newByteArray(BigArrays.java:453) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.util.BigArrays.newByteArray(BigArrays.java:466) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.io.stream.BytesStreamOutput.<init>(BytesStreamOutput.java:60) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.common.io.stream.ReleasableBytesStreamOutput.<init>(ReleasableBytesStreamOutput.java:36) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.transport.netty.NettyTransport.sendRequest(NettyTransport.java:792) [elasticsearch-2.1.1.jar:2.1.1]
at org.elasticsearch.transport.TransportService.sendRequest(TransportService.java:312) [elasticsearch-2.1.1.jar:2.1.1]
```

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<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, 11:30pm UTC](https://discuss.elastic.co/t/caused-by-java-lang-noclassdeffounderror-com-carrotsearch-hppc-bitmixer/37530/2 "2017-07-05T23:30:03Z")

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