Tech highlights from Javapolis 2007:
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Glassfish open source application server
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is now the reference implementation of the Servlet API
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v3 (currently in beta) is more modular. The demo had a fast startup time.
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Resin (commercial servlet container) claims to serve static content faster than Apache
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FindBugs will find a lot of potential Java bugs for you!
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provides a combination of modern scripting features and tight Java integration. For example, Groovy classes can implement Java interfaces.
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v1.5 offers signficant performance gains
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JRuby on Rails = Rails + support for calling Java code
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JavaRebel is a commercial product that enables auto-reloading of classes without restarting the server