Java Tomcat警告集群上下文管理器没有'；不存在

我在集群中有两台服务器运行Tomcat 7.0.54，有时在其中一台服务器上关闭或重新启动JVM时，我会看到这些上下文管理器警告：

2016-03-01 10:14:53,414 [Thread-8] INFO  org.apache.coyote.ajp.AjpProtocol- Pausing ProtocolHandler ["ajp-bio-8106"]
2016-03-01 10:14:53,471 [Thread-8] INFO  org.apache.coyote.http11.Http11Protocol- Pausing ProtocolHandler ["http-bio-8206"]
2016-03-01 10:14:53,521 [Thread-8] INFO  org.apache.catalina.core.StandardService- Stopping service MyService
2016-03-01 10:14:53,678 [Catalina-startStop-2] INFO  org.apache.catalina.ha.session.JvmRouteBinderValve- JvmRouteBinderValve stopped
2016-03-01 10:14:53,757 [localhost-startStop-2] INFO org.apache.catalina.ha.session.DeltaManager- Manager [] expiring sessions upon shutdown
2016-03-01 10:14:53,921 [Tribes-Task-Receiver-5] WARN  org.apache.catalina.ha.session.ClusterSessionListener- Context manager doesn't exist:
2016-03-01 10:14:53,936 [Tribes-Task-Receiver-5] WARN  org.apache.catalina.ha.session.ClusterSessionListener- Context manager doesn't exist:
2016-03-01 10:14:53,936 [Tribes-Task-Receiver-5] WARN  org.apache.catalina.ha.session.ClusterSessionListener- Context manager doesn't exist:
2016-03-01 10:14:53,994 [Tribes-Task-Receiver-5] WARN  org.apache.catalina.ha.session.ClusterSessionListener- Context manager doesn't exist:
2016-03-01 10:14:54,018 [Tribes-Task-Receiver-1] WARN  org.apache.catalina.ha.session.ClusterSessionListener- Context manager doesn't exist:
...

在运行Tomcat5.5的旧环境中也会发生这种情况。警告消息一直持续到Tomcat java进程被终止。在我所做的研究中，所有的例子在“context manager不存在：”之后都有一个context manager的名称，但我的没有。此外，我还看到一些人说将日志记录级别更改为严重级别以抑制这些消息。首先，如果java进程继续运行，除非我手动终止它，那么抑制警告不会有任何帮助。其次，我想知道为什么我会收到这些警告以及它们的含义。。。我还没有找到答案

我有3个问题：

这些警告意味着什么

为什么在“上下文管理器不存在：”之后为空

Tomcat在等待什么来停止java进程？（即，为什么不停止而不终止流程？）

conf/context.xml:

<Context path="" docBase="ROOT" debug="0" reloadable="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
</Context>

<?xml version='1.0' encoding='utf-8'?>
<Server port="8006" shutdown="SHUTDOWN">
    <GlobalNamingResources>
        <Environment name="simpleValue" type="java.lang.Integer" value="30"/>
        <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml" />
    </GlobalNamingResources>

    <Service name="MyService">
        <Connector port="8106" maxThreads="300" acceptCount="200" keepAliveTimeout="5" enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
        <Connector port="8206" enableLookups="false" redirectPort="8443" protocol="HTTP/1.1" />

        <Engine name="Catalina" defaultHost="localhost">
            <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>

            <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false">

                <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
                    <Manager className="org.apache.catalina.ha.session.DeltaManager"
                        expireSessionsOnShutdown="false"
                        notifyListenersOnReplication="true"/>

                    <Channel className="org.apache.catalina.tribes.group.GroupChannel">
                        <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                            address="<ip address of server 1>"
                            port="4006"
                            autoBind="100"
                            selectorTimeout="5000"
                            maxThreads="6"/>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">
                            <Member className="org.apache.catalina.tribes.membership.StaticMember"
                                port="4006" securePort="-1"
                                host="<ip address of server 2>"
                                domain="tomcat-server-cluster"
                                uniqueId="{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}" />
                        </Interceptor>

                        <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
                            <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
                        </Sender>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
                    </Channel>

                    <Valve className="org.apache.catalina.ha.tcp.ReplicationValve" filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;.*Monitor\.jsp;"/>
                    <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

                    <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
                    <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
                </Cluster>
            </Host>
        </Engine>
    </Service>
</Server>

WEB-INF/WEB.xml

conf/server.xml:

<Context path="" docBase="ROOT" debug="0" reloadable="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
</Context>

<?xml version='1.0' encoding='utf-8'?>
<Server port="8006" shutdown="SHUTDOWN">
    <GlobalNamingResources>
        <Environment name="simpleValue" type="java.lang.Integer" value="30"/>
        <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml" />
    </GlobalNamingResources>

    <Service name="MyService">
        <Connector port="8106" maxThreads="300" acceptCount="200" keepAliveTimeout="5" enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
        <Connector port="8206" enableLookups="false" redirectPort="8443" protocol="HTTP/1.1" />

        <Engine name="Catalina" defaultHost="localhost">
            <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>

            <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false">

                <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
                    <Manager className="org.apache.catalina.ha.session.DeltaManager"
                        expireSessionsOnShutdown="false"
                        notifyListenersOnReplication="true"/>

                    <Channel className="org.apache.catalina.tribes.group.GroupChannel">
                        <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                            address="<ip address of server 1>"
                            port="4006"
                            autoBind="100"
                            selectorTimeout="5000"
                            maxThreads="6"/>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">
                            <Member className="org.apache.catalina.tribes.membership.StaticMember"
                                port="4006" securePort="-1"
                                host="<ip address of server 2>"
                                domain="tomcat-server-cluster"
                                uniqueId="{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0}" />
                        </Interceptor>

                        <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
                            <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
                        </Sender>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
                        <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
                    </Channel>

                    <Valve className="org.apache.catalina.ha.tcp.ReplicationValve" filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;.*Monitor\.jsp;"/>
                    <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

                    <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
                    <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
                </Cluster>
            </Host>
        </Engine>
    </Service>
</Server>

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我找到了你问题的答案