Apache CXF 2.0 User's Guide
JAXB is enabled by default inside CXF. To learn more about annotating your classes or how to generate beans from a schema, please read the JAXB user's guide
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If you are looking for a performance boost inside your application, you may want to examine SXC, which provides a drop in JAXB runtime supplement which can speed up reading/writing JAXB beans.