A global Glassfish outage

One of the exciting things about teaching is the fact no matter how well you prepare for a class, events will always surprise you.Yesterday I was caught by surprise in the middle of a class by what seemed like a global Glassfish admin console outage. I was teaching my Software Architecture students at IGTI how to change the default maximum thread pool size for the HTTP listener in Glassfish 3.0.1. We needed to do that in order to run a JMeter load test against our example application. The default maximum thread pool size in Glassfish is just 5 threads, which makes it impossible to stress the system with a decent  number of concurrent users. I tried to access the Glassfish admin console on http://localhost:4848 on my notebook. It started loading but hang after the "Admin Console is starting..." screen. Restarted Glassfish, no change. So I thought: "well, my Glassfish instance must be broken somehow". Tried it on a student notebook, same thing: admin console would still failed to load. Switched to a remote virtual desktop(Ubuntu Lucid) running on Amazon EC2, started Glassfish, tried to load management console. Same result, hangs after the starting screen. Luckily we had a coffee break coming up so I sent the students to eat something while I tried to figure out what was going on. What could possibly have broken admin console in 4 Glassfish instances running under two operating systems (Windows and Linux) in two different co...

Date: November, 10 2010
Url: http://www.java.net/blog/jjviana/archive/2010/11/10/global-glassfish-outage

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