What a title! Totally vague opener followed by a very specific set of open source Java tool project names. One can view the four listed tools from the outside as a representative, complete (err, throw in Eclipse and a half dozen plugins, actually, in my case) development toolkit; four powerful, cross-platform (oh yeah, and free and open source) tools for today's professional. Internal to the professional Java world, these open source tools are four out of dozens of others (not to mention non-free and/or non-open source tools) that developers use by choice or by company standard on projects today.
XDoclet and WebWork are for totally different purposes (attribute-oriented code generator and MVC framework, respectively), but closely related by birth (Rickard Oberg), while Hibernate (as far as my ignorance goes) is a more recent close cousin -- an XML-based O/R mapping code generator for Java and SQL. JUnit is of course the trusty, ubiquitous Java unit testing framework. It could be said that the four tools in the title are in at least one sense an arbitrary set, but on the other hand they have widely overlapping user and developer communities.
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