# Why I'm getting this error?

**URL:** <https://discuss.elastic.co/t/why-im-getting-this-error/7798>\
**Category:** Elasticsearch\
**Created:** [May 22, 2012, 1:01am UTC](https://discuss.elastic.co/t/why-im-getting-this-error/7798 "2012-05-22T01:01:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vreal](https://avatars.discourse-cdn.com/v4/letter/v/5f9b8f/32.png) [@vreal](https://discuss.elastic.co/u/vreal)\
**Post date:** [May 22, 2012, 1:01am UTC](https://discuss.elastic.co/t/why-im-getting-this-error/7798/1 "2012-05-22T01:01:29Z")

</div>

(Slf4jESLogger.java:109) - [Scrier] Exception caught on netty layer [[id: 0x7f001ba5, /10.126.47.7:59258 =\> /10.195.83.112:9300]]  
java.lang.NoClassDefFoundError: org/elasticsearch/transport/netty/MessageChannelHandler$RequestHandler  
at org.elasticsearch.transport.netty.MessageChannelHandler.handleRequest(MessageChannelHandler.java:318) ~[elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.transport.netty.MessageChannelHandler.process(MessageChannelHandler.java:217) ~[elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.transport.netty.MessageChannelHandler.callDecode(MessageChannelHandler.java:141) ~[elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:95) ~[elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:75) ~[elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:777) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.OpenChannelsHandler.handleUpstream(OpenChannelsHandler.java:74) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:553) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) [elasticsearch-0.19.0.jar:na]  
at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [elasticsearch-0.19.0.jar:na]  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [na:1.6.0\_22]  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [na:1.6.0\_22]  
at java.lang.Thread.run(Thread.java:679) [na:1.6.0\_22]

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<div class="post-metadata">

**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\
**Post date:** [May 23, 2012, 10:36pm UTC](https://discuss.elastic.co/t/why-im-getting-this-error/7798/2 "2012-05-23T22:36:29Z")

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Thats strange..., that class is part of the elasticsearch jar, which you  
seem to use... . Do you maybe have several elasticsearch jars in your file  
system?

On Tue, May 22, 2012 at 3:01 AM, Ye Zhou [zhouy.vreal@gmail.com](mailto:zhouy.vreal@gmail.com) wrote:

> (Slf4jESLogger.java:109) - [Scrier] Exception caught on netty layer [[id:  
> 0x7f001ba5, /10.126.47.7:59258 =\> /10.195.83.112:9300]]  
> java.lang.NoClassDefFoundError:  
> org/elasticsearch/transport/netty/MessageChannelHandler$RequestHandler  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.handleRequest(MessageChannelHandler.java:318)  
> ~[elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.process(MessageChannelHandler.java:217)  
> ~[elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.callDecode(MessageChannelHandler.java:141)  
> ~[elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:95)  
> ~[elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:75)  
> ~[elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:777)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.OpenChannelsHandler.handleUpstream(OpenChannelsHandler.java:74)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:553)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)  
> [elasticsearch-0.19.0.jar:na]  
> at  
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)  
> [na:1.6.0\_22]  
> at  
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)  
> [na:1.6.0\_22]  
> at java.lang.Thread.run(Thread.java:679) [na:1.6.0\_22]

---

<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 6, 2017, 3:27am UTC](https://discuss.elastic.co/t/why-im-getting-this-error/7798/3 "2017-07-06T03:27:26Z")

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