Deployment

[Mandan Happy]

Hello,
Am not new to j2ee however I havent done any large scale application development using j2ee .
Can some one eXplain ( or point me to some resources )with respect to an Appserver(
weblogic or websphere) how large scale applications are deployed .
for Eg-
On weblogic 7.O a single domain will have a administration server and many managed servers and the j2ee applications would reside in the managed servers .
On what criteria is a deployment unit created say an EAR file.
Do EJBs in a EAR file communicate with another EJB in another EAR file in another managed server
in a typical scenario ?
ThanX
Mandan

[Matt Rasking]

Mandan,
for Bea Weblogic 6.1/7.0:
the managed servers are just instances of the same Application Server in a cluster. Therefore all EJBs in an .ear package can and would talk to EJBs on other managed servers, meaning on other nodes of the cluster.
However I have never deployed ear files, only jar files, since we migrated from WLS5.1 to 6.1 and the Classloader setting shave changes substantially. We found individual jar files a lot easier to handle than complete ear files. Check this out for more info:
WLS 6.1 Deploy EJB's
Regards,
Matt.

[Simon Brown]

And here's a good article that explains how J2EE packaging works -> http://www.theserverside.com/resources/article.jsp?l=J2EE-Deployment
Simon