New class, deployment of new war file ? What else ?
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Normally, JBoss does not require a restart on redeploy (at least for JavaEE deployments of EAR, WAR, Ejb jar). But if your app uses some external framework, there might occur strange problems on redeploy - this is actually a bug in the component or the way JBoss handles it, not the "by design" behaviour ;-).
Changes to the server config (e.g. logging, login-config.xml) require server restarts.
I am not sure about services, but I think they are hot-deployable.
Hope this helps
Thanks a lot Wolfgang for your answer ;-) you are right, they are a hot deploy