[jboss-dev-forums] [JBoss XML Binding Development] - Re: XB profiling during the AS start-up

[jason.greene@jboss.com]

"alex.loubyansky at jboss.com" wrote : "adrian at jboss.org" wrote : anonymous wrote : 
  |   |   | jaxb parsers had been generated and compiled before the test run.
  |   | 
  |   | Ok, so what is fast jaxb doing that it is 3 times slower on the first iteration
  |   | (even though you have already pre-generated classes)?
  |   | Is it parsing the xml schema or something? Are you comparing apples to apples?
  | 
  | I actually can't comment at the moment of what the bottleneck is. Maybe I'm missing something, but it looks to me like apples to apples.
  | At least that's how a simple parsing client is supposed to use the API.

Perhaps it's something like Adrian suggests where the fast-jaxb classes are using schema validation. It just doesn't make sense that a pregenerated parser would be slower than a dynaimc reflection based model. The pregenerated version has less work to actually do, and it can do direct method invocation as opposed to reflection which is definitely faster.

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