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Spring in Action

 
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In your opinion,what has proven to be the best/most useful new feature in Spring 3 ?
 
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My favorite features to talk about are the Spring Expression Language (SpEL) and the new @Async and @Scheduled annotations. That's because they have a lot of "wow" factor when I present them.

In a more practical sense (not that SpEL and those annotations aren't practical...I just don't use them quite as often), I enjoy using @RequestBody and @ResponseBody in my controllers and relying on message converters to work their magic in converting messages to and from whatever object I need to work with them as.

Of course, the Java configuration option is pretty awesome, too.
 
paul nisset
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Thanks for the input.
 
Don't get me started about those stupid light bulbs.
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