Did you read this and follow along? http://opensource.atlassian.com/confluence/oss/display/GERONIMO/Geronimo+Clustering+Example
Following the steps in the link should yield you replication. Jeff 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
