# Exceptions for TransportClient on Tomcat 6 reload

**URL:** https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889
**Category:** Elasticsearch
**Created:** [February 5, 2011, 6:18pm UTC](https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889 "2011-02-05T18:18:43Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![Karussell1](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@Karussell1](https://discuss.elastic.co/u/Karussell1)
#### Post date: [February 5, 2011, 6:18pm UTC](https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889/1 "2011-02-05T18:18:43Z")

</div>

Hi,

not sure if this is my mistake a problem with ES. See the stacktrace  
below which occurs every time I restart Tomcat. My java app uses the  
TransportClient.

Regards,  
Peter.

Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
clearReferencesThreads  
SEVERE: The web application [/jetwick] appears to have started a  
thread named [org.elasticsearch.common.inject.internal.util.  
$Finalizer] but has failed to stop it. This is very likely to create a  
memory leak.  
...  
Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
clearThreadLocalMap  
SEVERE: The web application [/jetwick] created a ThreadLocal with key  
of type [null] (value  
[org.elasticsearch.common.inject.internal.InjectorImpl$1@5ff8ce]) and  
a value of type [java.lang.Object[]] (value  
[[Ljava.lang.Object;@c7dc2d]) but failed to remove it when the web  
application was stopped. This is very likely to create a memory leak.  
INFO: Illegal access: this web application instance has been stopped  
already. Could not load  
org.elasticsearch.transport.netty.MessageChannelHandler$2. The  
eventual following stack trace is  
java.lang.IllegalStateException  
at  
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
1531)  
at  
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
1491)  
at  
org.elasticsearch.transport.netty.MessageChannelHandler.handleException(MessageChannelHandler.java:  
166)  
at  
org.elasticsearch.transport.netty.MessageChannelHandler.handleResponse(MessageChannelHandler.java:  
126)  
at  
org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:  
102)  
at  
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
80)  
at  
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
545)  
at  
org.elasticsearch.common.netty.channel.DefaultChannelPipeline  
$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:  
754)  
at  
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
302)  
at  
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:  
317)  
at  
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:  
299)  
at  
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:  
214)  
at  
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
80)  
at  
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
545)  
at  
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
540)  
at  
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
274)  
at  
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
261)  
at  
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:  
350)  
at  
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:  
281)  
at  
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:  
201)  
at  
org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:  
108)  
at  
org.elasticsearch.common.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:  
46)  
at java.util.concurrent.ThreadPoolExecutor  
$Worker.runTask(ThreadPoolExecutor.java:886)  
at java.util.concurrent.ThreadPoolExecutor  
$Worker.run(ThreadPoolExecutor.java:908)  
at java.lang.Thread.run(Thread.java:619)

---

<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: [February 5, 2011, 6:26pm UTC](https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889/2 "2011-02-05T18:26:28Z")

</div>

Its a leak in Google Guava, I think they are working on a fix.  
On Saturday, February 5, 2011 at 8:18 PM, Karussell wrote:

> Hi,
> 
> not sure if this is my mistake a problem with ES. See the stacktrace  
> below which occurs every time I restart Tomcat. My java app uses the  
> TransportClient.
> 
> Regards,  
> Peter.
> 
> Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
> clearReferencesThreads  
> SEVERE: The web application [/jetwick] appears to have started a  
> thread named [org.elasticsearch.common.inject.internal.util.  
> $Finalizer] but has failed to stop it. This is very likely to create a  
> memory leak.  
> ...  
> Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
> clearThreadLocalMap  
> SEVERE: The web application [/jetwick] created a ThreadLocal with key  
> of type [null] (value  
> [org.elasticsearch.common.inject.internal.InjectorImpl$1@5ff8ce]) and  
> a value of type [java.lang.Object] (value  
> [[Ljava.lang.Object;@c7dc2d]) but failed to remove it when the web  
> application was stopped. This is very likely to create a memory leak.  
> INFO: Illegal access: this web application instance has been stopped  
> already. Could not load  
> org.elasticsearch.transport.netty.MessageChannelHandler$2. The  
> eventual following stack trace is  
> java.lang.IllegalStateException  
> at  
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
> 1531)  
> at  
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
> 1491)  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.handleException(MessageChannelHandler.java:  
> 166)  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.handleResponse(MessageChannelHandler.java:  
> 126)  
> at  
> org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:  
> 102)  
> at  
> org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
> 80)  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> 545)  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline  
> $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:  
> 754)  
> at  
> org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> 302)  
> at  
> org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:  
> 317)  
> at  
> org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:  
> 299)  
> at  
> org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:  
> 214)  
> at  
> org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
> 80)  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> 545)  
> at  
> org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> 540)  
> at  
> org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> 274)  
> at  
> org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> 261)  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:  
> 350)  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:  
> 281)  
> at  
> org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:  
> 201)  
> at  
> org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:  
> 108)  
> at  
> org.elasticsearch.common.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:  
> 46)  
> at java.util.concurrent.ThreadPoolExecutor  
> $Worker.runTask(ThreadPoolExecutor.java:886)  
> at java.util.concurrent.ThreadPoolExecutor  
> $Worker.run(ThreadPoolExecutor.java:908)  
> at java.lang.Thread.run(Thread.java:619)

---

<div class="post-metadata">

### Author: ![Karussell1](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@Karussell1](https://discuss.elastic.co/u/Karussell1)
#### Post date: [February 5, 2011, 6:37pm UTC](https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889/3 "2011-02-05T18:37:34Z")

</div>

Oh, ok. The only workarounds are to use jetty and complete sever  
restart 🙂 ?

On 5 Feb., 19:26, Shay Banon [shay.ba...@elasticsearch.com](mailto:shay.ba...@elasticsearch.com) wrote:

> Its a leak in Google Guava, I think they are working on a fix.
> 
> On Saturday, February 5, 2011 at 8:18 PM, Karussell wrote:
> 
> > Hi,
> 
> > not sure if this is my mistake a problem with ES. See the stacktrace  
> > below which occurs every time I restart Tomcat. My java app uses the  
> > TransportClient.
> 
> > Regards,  
> > Peter.
> 
> > Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
> > clearReferencesThreads  
> > SEVERE: The web application [/jetwick] appears to have started a  
> > thread named [org.elasticsearch.common.inject.internal.util.  
> > $Finalizer] but has failed to stop it. This is very likely to create a  
> > memory leak.  
> > ...  
> > Feb 1, 2011 11:17:48 PM org.apache.catalina.loader.WebappClassLoader  
> > clearThreadLocalMap  
> > SEVERE: The web application [/jetwick] created a ThreadLocal with key  
> > of type [null] (value  
> > [org.elasticsearch.common.inject.internal.InjectorImpl$1@5ff8ce]) and  
> > a value of type [java.lang.Object] (value  
> > [[Ljava.lang.Object;@c7dc2d]) but failed to remove it when the web  
> > application was stopped. This is very likely to create a memory leak.  
> > INFO: Illegal access: this web application instance has been stopped  
> > already. Could not load  
> > org.elasticsearch.transport.netty.MessageChannelHandler$2. The  
> > eventual following stack trace is  
> > java.lang.IllegalStateException  
> > at  
> > org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
> > 1531)  
> > at  
> > org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:  
> > 1491)  
> > at  
> > org.elasticsearch.transport.netty.MessageChannelHandler.handleException(MessageChannelHandler.java:  
> > 166)  
> > at  
> > org.elasticsearch.transport.netty.MessageChannelHandler.handleResponse(MessageChannelHandler.java:  
> > 126)  
> > at  
> > org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:  
> > 102)  
> > at  
> > org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
> > 80)  
> > at  
> > org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> > 545)  
> > at  
> > org.elasticsearch.common.netty.channel.DefaultChannelPipeline  
> > $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:  
> > 754)  
> > at  
> > org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> > 302)  
> > at  
> > org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:  
> > 317)  
> > at  
> > org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:  
> > 299)  
> > at  
> > org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:  
> > 214)  
> > at  
> > org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:  
> > 80)  
> > at  
> > org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> > 545)  
> > at  
> > org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:  
> > 540)  
> > at  
> > org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> > 274)  
> > at  
> > org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:  
> > 261)  
> > at  
> > org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:  
> > 350)  
> > at  
> > org.elasticsearch.common.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:  
> > 281)  
> > at  
> > org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:  
> > 201)  
> > at  
> > org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:  
> > 108)  
> > at  
> > org.elasticsearch.common.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:  
> > 46)  
> > at java.util.concurrent.ThreadPoolExecutor  
> > $Worker.runTask(ThreadPoolExecutor.java:886)  
> > at java.util.concurrent.ThreadPoolExecutor  
> > $Worker.run(ThreadPoolExecutor.java:908)  
> > at java.lang.Thread.run(Thread.java:619)

---

<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, 4:12am UTC](https://discuss.elastic.co/t/exceptions-for-transportclient-on-tomcat-6-reload/3889/4 "2017-07-06T04:12:34Z")

</div>