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From "Pitre, Russell" <RPI...@shawmut.com>
Subject Tomcat 4.1.29 Clustering
Date Thu, 11 Dec 2003 21:18:25 GMT
Hello All,  

 

I think this may be a question for Filip.....I am testing a network load
balancing and tomcat clustering configuration
(InMemorySessionReplication)......Here's my setup:

 

I have two servers both of which have IIS 5 and Tomcat 4.1.29 installed.
I am using Microsoft Network Load Balancing Services to do my front end
load balancing/failover detection in front of the two IIS web
servers....I implemented the JK2 connector between IIS and Tomcat on
both of the boxes.  NLB services and the JK2 Connector setup are working
great!  I downloaded tomcat-javagroups.jar and javagroups.jar and put
them in my /server/lib directory.....I also have the following in webapp
<context> element:

 

<Manager
className="org.apache.catalina.session.InMemoryReplicationManager"
protocolStack="UDP(mcast_addr=228.1.2.3;mcast_port=45566;ip_ttl=32)
:PING(timeout=3000;num_initial_members=6):FD(timeout=5000):
VERIFY_SUSPECT(timeout=1500):pbcast.STABLE
(desired_avg_gossip=10000):pbcast.NAKACK(gc_lag=10;retransmit_timeout=30
00):
UNICAST(timeout=5000;min_wait_time=2000):MERGE2:FRAG:pbcast.GMS
(join_timeout=5000;join_retry_timeout=2000;shun=false;print_local_addr=f
alse)">
</Manager>

 

I copied and pasted the above from here:
http://www.theserverside.com/resources/article.jsp?l=Tomcat

 

When I start up Tomcat I see the EXPECTED error that the
InSessionMemoryReplication mbean is not found.   Cool.....

 

I can access static content no problem such as an html page but, when I
go to access .jsp page I receive the following error in the localhost
log.....

 

2003-12-11 15:55:56 JspFactoryImpl: Exception initializing page context

java.lang.NullPointerException

            at
org.apache.catalina.session.InMemoryReplicationManager.createSession(InM
emoryReplicationManager.java:212)

            at
org.apache.catalina.session.InMemoryReplicationManager.createSession(InM
emoryReplicationManager.java:242)

            at
org.apache.coyote.tomcat4.CoyoteRequest.doGetSession(CoyoteRequest.java:
1882)

 

 

 

I'm not sure what to make of this....I know I need to make all of my
session attributes implement java.io.Serializable......But, I haven't
even put anything into my session yet........I'm just accessing a jsp
that is bare bones with just a simple "hello" string......

 

 

Any Ideas?

 

 

 


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