I read some articles regarding apache+jk2+jboss saying that:you have to start jboss servers before start apache web server. what's the reason for this order? what happen if one of jboss server failed in the cluser,I have to restart this jboss server while the apache and all of others jboss server are still runing? do I have to stop the apache,wait for this jboss server started,the restart the apache? if so,the web site has to stop for a moment.