Comparison of JBoss AS 7.x and Glassfish 3.x?

Question

I was wondering if there is a (mostly) objective comparison between the JBoss AS 7 and Glassfish 3.x?

I don't care for any differences in standards or their implementation, I was thinking more about startup time, failover, scalability, performance, memory footprint, known problems, administration, security, clustering etc.

Real world examples & experiences are very welcome!

Answer 1

My opinion is that after the aquisition of Red Hat to JBoss the general quality of documentation has dropped significantly. Even if JBoss is the better product in my next project I will shift to GlassFish because of the better documentation. Who cares about the startup plan if you loose 2/3 of your time dealing with lack of proper documentation? JBoss 4 and 5 wer an examples of a properly documented products. Things have changes for worse.

Answer 2

Antonio Goncalves recently did a comparison of all the latest application servers including some of the metrics you requested - http://agoncal.wordpress.com/2011/10/20/o-java-ee-6-application-servers-where-art-thou/ .