Thanks a lot guys for your prompt response.

Now I face another error given below: 
SEVERE: Unable to start ReplicatedContext
java.lang.ClassCastException:
org.apache.catalina.cluster.tcp.SimpleTcpCluster
        at
org.apache.catalina.ha.context.ReplicatedContext.start(ReplicatedContext.java:61)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at
org.apache.catalina.core.StandardHost.start(StandardHost.java:719)

The modified server.xml file looks like below:

                <Cluster 
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
                
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
                 expireSessionsOnShutdown="false"
                 useDirtyFlag="true">

            <Membership 
                className="org.apache.catalina.cluster.mcast.McastService"
                mcastAddr="228.0.0.4"
                mcastPort="45564"
                mcastFrequency="500"
                mcastDropTime="3000"/>

            <Receiver 
               
className="org.apache.catalina.cluster.tcp.ReplicationListener"
                tcpListenAddress="127.0.0.1"
                tcpListenPort="4001"
                tcpSelectorTimeout="100"
                tcpThreadCount="6"/>

            <Sender
               
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
                replicationMode="pooled"/>
            <Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
                  
filter=".*\.gif;.*\.js;.*\.jpg;.*\.htm;.*\.html;.*\.txt;"/>
                        <ClusterListener 
                                
className="org.apache.catalina.cluster.session.ClusterSessionListener"/>

        </Cluster>
                <Context 
className="org.apache.catalina.ha.context.ReplicatedContext"
path="/MyApp" docBase="G:\RealNetworks\apache-tomcat-6.0.16\webapps\MyApp"
crossContext="true" debug="0" reloadable="true" privileged="true"/>


Any idea guys on why is that error coming ?

Thanks a lot again for your help.






Filip Hanik - Dev Lists wrote:
> 
> you'd need to define
> 
> <Context className="org.apache.catalina.ha.context.ReplicatedContext" ...
> 
> 
> for each context that you want that to happen
> 
> Filip
> 
> gangadhar p wrote:
>> Hi guys, I am configuring Tomcat 6 clustering to have more than one
>> instance
>> access to each others ServletContext attributes.  It's said that
>> ServletContext is clustered by default when Tomcat 6 is clustered, but my
>> servlets in 2 different instances are not able to access each others
>> ServletContext attributes. The Cluster elements added under the element
>> Host
>> in two different server.xml files in two different instances are given
>> below.
>> In Tomcat Instance 1 :
>>
>>              <Cluster 
>> className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
>>                 
>> managerClassName="org.apache.catalina.cluster.session.DeltaManager"
>>                  expireSessionsOnShutdown="false"
>>                  useDirtyFlag="true">
>>
>>             <Membership 
>>                
>> className="org.apache.catalina.cluster.mcast.McastService"
>>                 mcastAddr="228.0.0.4"
>>                 mcastPort="45564"
>>                 mcastFrequency="500"
>>                 mcastDropTime="3000"/>
>>
>>             <Receiver 
>>                
>> className="org.apache.catalina.cluster.tcp.ReplicationListener"
>>                 tcpListenAddress="127.0.0.1"
>>                 tcpListenPort="4001"
>>                 tcpSelectorTimeout="100"
>>                 tcpThreadCount="6"/>
>>
>>             <Sender
>>                
>> className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
>>                 replicationMode="pooled"/>
>>             <Valve
>> className="org.apache.catalina.cluster.tcp.ReplicationValve"
>>                   
>> filter=".*\.gif;.*\.js;.*\.jpg;.*\.htm;.*\.html;.*\.txt;"/>
>>                      <ClusterListener 
>>                              
>> className="org.apache.catalina.cluster.session.ClusterSessionListener"/>
>>
>>         </Cluster>
>>
>>
>> In Tomcat Instance 2:
>>
>>              <Cluster 
>> className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
>>                 
>> managerClassName="org.apache.catalina.cluster.session.DeltaManager"
>>                  expireSessionsOnShutdown="false"
>>                  useDirtyFlag="true">
>>
>>             <Membership 
>>                
>> className="org.apache.catalina.cluster.mcast.McastService"
>>                 mcastAddr="228.0.0.4"
>>                 mcastPort="45564"
>>                 mcastFrequency="500"
>>                 mcastDropTime="3000"/>
>>
>>             <Receiver 
>>                
>> className="org.apache.catalina.cluster.tcp.ReplicationListener"
>>                 tcpListenAddress="127.0.0.1"
>>                 tcpListenPort="4002"
>>                 tcpSelectorTimeout="100"
>>                 tcpThreadCount="6"/>
>>
>>             <Sender
>>                
>> className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
>>                 replicationMode="pooled"/>
>>             <Valve
>> className="org.apache.catalina.cluster.tcp.ReplicationValve"
>>                   
>> filter=".*\.gif;.*\.js;.*\.jpg;.*\.htm;.*\.html;.*\.txt;"/>
>>                      <ClusterListener 
>>                              
>> className="org.apache.catalina.cluster.session.ClusterSessionListener"/>
>>
>>         </Cluster>
>>
>>
>> Pls. let me know if any more changes are needed. It's very urgent.
>> Thanks a lot in advance for your help.
>>
>>   
> 
> 
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