The web application [FileIO_new_interface] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@1c27fa09]) and a value of type [java.lang.Class] (value [class com.cetc.di.io.impl.SayHelloImpl]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak. 这个错误是说，网络应用[FileIO_new_interface]创建了一个本地线程，但是在web application停止的时候，没有成功的被清除掉，这可能导致潜在的内存溢出错误，解决办法是手动杀掉相关的进程。方法是通过端口号，通过服务开放的端口号找出进程号，然后杀掉。

...skipping...

 sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)

 sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)

 sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)

 org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:68)

 org.jboss.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:409)

 org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:206)

 org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)

 org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)

 org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)

 org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)

 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

 java.lang.Thread.run(Thread.java:745)

17-Nov-2015 17:10:15.936 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [FileIO_new_interface] appears to have started a thread named [New I/O worker #5] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)

 sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)

 sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)

 sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)

 sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)

 org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:68)

 org.jboss.netty.channel.socket.nio.AbstractNioSelector.select(AbstractNioSelector.java:409)

 org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:206)

 org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)

 org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)

 org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)

 org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)

 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

 java.lang.Thread.run(Thread.java:745)

17-Nov-2015 17:10:15.937 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [FileIO_new_interface] appears to have started a thread named [New I/O server boss #6] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)

 sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)

 sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)

 sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)

 sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)

 sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)

 org.jboss.netty.channel.socket.nio.NioServerBoss.select(NioServerBoss.java:163)

 org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:206)

 org.jboss.netty.channel.socket.nio.NioServerBoss.run(NioServerBoss.java:42)

 org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)

 org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)

 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

 java.lang.Thread.run(Thread.java:745)

17-Nov-2015 17:10:15.938 SEVERE [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [FileIO_new_interface] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@1c27fa09]) and a value of type [java.lang.Class] (value [class com.cetc.di.io.impl.SayHelloImpl]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

17-Nov-2015 17:10:15.948 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive /usr/tomcat/apache-tomcat-8.0.28/webapps/FileIO_new_interface.war has finished in 9,289 ms

17-Nov-2015 17:10:15.950 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /usr/tomcat/apache-tomcat-8.0.28/webapps/ROOT

17-Nov-2015 17:10:15.989 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /usr/tomcat/apache-tomcat-8.0.28/webapps/ROOT has finished in 39 ms

解决办法：

[root@localhost webapps]# ps -ef | grep tomcat

root       772     1  3 17:10 pts/0    00:00:32 /usr/java/jdk1.8.0_65/jre/bin/java -Djava.util.logging.config.file=/usr/tomcat/apache-tomcat-8.0.28/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/tomcat/apache-tomcat-8.0.28/endorsed -classpath /usr/tomcat/apache-tomcat-8.0.28/bin/bootstrap.jar:/usr/tomcat/apache-tomcat-8.0.28/bin/tomcat-juli.jar -Dcatalina.base=/usr/tomcat/apache-tomcat-8.0.28 -Dcatalina.home=/usr/tomcat/apache-tomcat-8.0.28 -Djava.io.tmpdir=/usr/tomcat/apache-tomcat-8.0.28/temp org.apache.catalina.startup.Bootstrap start

root       838 17424  0 17:25 pts/0    00:00:00 grep tomcat

root     17532     1  0 Nov13 pts/0    00:11:54 /usr/java/jdk1.8.0_65/jre/bin/java -Djava.util.logging.config.file=/usr/tomcat/apache-tomcat-8.0.28/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/tomcat/apache-tomcat-8.0.28/endorsed -classpath /usr/tomcat/apache-tomcat-8.0.28/bin/bootstrap.jar:/usr/tomcat/apache-tomcat-8.0.28/bin/tomcat-juli.jar -Dcatalina.base=/usr/tomcat/apache-tomcat-8.0.28 -Dcatalina.home=/usr/tomcat/apache-tomcat-8.0.28 -Djava.io.tmpdir=/usr/tomcat/apache-tomcat-8.0.28/temp org.apache.catalina.startup.Bootstrap start

[root@localhost webapps]# netstat -apn | grep 20880

[root@localhost webapps]# netstat -apn | grep 20151

tcp        0      0 :::20151                    :::*                        LISTEN      17532/java
[root@localhost webapps]# kill -9 17532

[root@localhost webapps]# netstat -apn | grep 20151

[root@localhost webapps]# rm -fr ../logs/catalina.*

[root@localhost webapps]# ls

docs  examples  FileIO_new_interface  FileIO_new_interface.war  host-manager  manager  ROOT

[root@localhost webapps]# rm -fr FileIO_new_interface

[root@localhost webapps]# less ../logs/

host-manager.2015-11-10.log          localhost.2015-11-10.log             localhost.2015-11-17.log             localhost_access_log.2015-11-17.txt  manager.2015-11-17.log

host-manager.2015-11-11.log          localhost.2015-11-11.log             localhost_access_log.2015-11-10.txt  manager.2015-11-10.log

host-manager.2015-11-13.log          localhost.2015-11-12.log             localhost_access_log.2015-11-11.txt  manager.2015-11-11.log

host-manager.2015-11-16.log          localhost.2015-11-13.log             localhost_access_log.2015-11-13.txt  manager.2015-11-13.log

host-manager.2015-11-17.log          localhost.2015-11-16.log             localhost_access_log.2015-11-16.txt  manager.2015-11-16.log

[root@localhost webapps]# less ../logs/

host-manager.2015-11-10.log          localhost.2015-11-10.log             localhost.2015-11-17.log             localhost_access_log.2015-11-17.txt  manager.2015-11-17.log

host-manager.2015-11-11.log          localhost.2015-11-11.log             localhost_access_log.2015-11-10.txt  manager.2015-11-10.log

host-manager.2015-11-13.log          localhost.2015-11-12.log             localhost_access_log.2015-11-11.txt  manager.2015-11-11.log

host-manager.2015-11-16.log          localhost.2015-11-13.log             localhost_access_log.2015-11-13.txt  manager.2015-11-13.log

host-manager.2015-11-17.log          localhost.2015-11-16.log             localhost_access_log.2015-11-16.txt  manager.2015-11-16.log

[root@localhost webapps]# ls

docs  examples  FileIO_new_interface  FileIO_new_interface.war  host-manager  manager  ROOT

[root@localhost webapps]# netstat -lntpu | grep 8080

tcp        0      0 :::8080                     :::*                        LISTEN      772/java

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