Agreed with this 100%, reading the source code of well documented libraries is highly valuable. I feel that personally it helps be better understand the interna

Agreed with this 100%, reading the source code of well documented libraries is highly valuable. I feel that personally it helps be better understand the internals and what I can leverage. The documentation in Spring's source is really great, along with their reference docs online. I've had similar experiences with SO being out of date or kind of poor - when I run across those I have been trying to add a newer answer (I do a lot of Spring so I run across this a lot).