gentlemen,
looks like there is an attribute missing from the
"<Cluster...>*<Receiver.../>*</Cluster>" element.
the ReplicationListener.listen() method just gets the listen address (or
tries to resolve the name, then gets the port)
then it starts up a server socket using NIO.
the other error, no active members in group, just means that the tomcat
instances didn't discover each other using multicast heart beats.
Lets get the ReplicationListener error first, then we can move on to
membership, can you post your tomcat config file
PS. the error is not related to mod_jk, its in the tomcat java code.
thanks
Filip
Phani Madgula wrote:
Hi,
I have been trying to use tomcat clustering with Geronimo for a
customer application. Sometimes, I face the following problem.
I downloaded apache2.0.54 and mod_jk_1.2.15 and tested clustering. I
have three machines on a same subnet one windows and other are linux
boxes. I have also enabled IPMulticast and no firewalls between systems.
To my observation, session replication is not working. However,
loadbalancer is able to fail-over successfully.
When I shutdown the instance which is serving the HttpRequests, it
will throw an exception stating "not able to start cluster listener"
and also "no active members in the cluster"
11:09:10,572 DEBUG [WebappLoader] Stopping this Loader
11:09:10,573 ERROR [ReplicationListener] Unable to start cluster listener.
java.lang.NullPointerException
at
org.apache.catalina.cluster.tcp.ReplicationListener.listen(ReplicationListener.java(Compiled
Code))
at
org.apache.catalina.cluster.tcp.ReplicationListener.run(ReplicationListener.java:125)
at java.lang.Thread.run(Thread.java:570)
11:09:10,573 DEBUG [StandardContext] resetContext Geronimo
:j2eeType=WebModule,name=//localhost/servlet-examples-cluster,J2EEApplication=none,J2EEServer=none
null
11:09:10,575 DEBUG [StandardContext] Stopping complete
or
11:03:07,998 INFO [DeltaManager] Manager [/servlet-examples-cluster]:
skipping state transfer. No members active in cluster group.
I have tested with both mod_jk_1.2.14 & mod_jk_1.2.15, but failed.
Any ideas on why this error comes?..
Thx
phani
