I've used Java Architecture for XML Binding (JAXB) successfully for a wide set of problems and generally really like it . However, it is not without its downsides.

Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance. In reality, that ...

Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.