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.