[jboss-user] [Clustering] - Hot deply new version of a webapp

[jdcmember]

JBoss configuration:
* JBoss/Tomcat with a web app, clustered using ehcache (not JBoss caching -- 
but that's not important). 5 JBoss instances in the cluster.
* Apache mod_jk-based loadbalancing with sticky sessions

The problem:
How to deply a new version of the webapp *without bringing down JBoss*. We'd 
like to upgrade webapp so that
* New sessions get routed to the upgraded version of the webapp
* Existing sessions stay routed to older version of the webapp
* Clients are essentially unaware that upgrade is going on -- URLs to the 
webapp don't change, existing sessions continue without interruption, new 
sessions can be started, app never appears to come down from a client POV.

Any advise on which load balancer to use to achieve this? Particular brand of 
hardware or software? We think we got a handle on JBoss configuration and 
management, and management of the distributed caches, but getting we don't have 
any experience on involving the load balancer in the mix.

Thanks in advance for any advise, wisdom, revelations, or knowledge!

Best regards,
Brian Maso

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[jboss-user] [JBossWS] - Re: WSDL First Model?

[jdcmember]

If you're looking to build JSR-181 endpoints, then you can "handcraft" the 
implement class, endpoint interface, and all the JAXB value classes using 
JSR-181 annotations.

I'm using the JAX-WS 2.0 RI "wsimport" tool to generate these classes frm a 
hand-crafted WSDL. (Throw away the "-Service.java" class that gets generated as 
that's client-side only stuff.) Implement the endpoint interface, package as a 
beas or in a WAR, and you're off. I've run in to a few deployment-time problems 
in complex WSDL/schema cases, but generally seems to be working well with this 
technique.

Brian Maso

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