I am heavily involved in developing with the Spring Framework, which we use as glue and (little) helper in our banking application which grew quite big over the years.
I started learning Spring 2006 and it really has a steep learning curve (in the old-fashing meaning), meaning that it is quite simple to understand the core concepts. However, there are bits and bobs about the Spring Framework which really make use of it productive (vs. just using dependency injection and JDBCTemplate).
There exists (at least!) two really useful bits of documentation for Spring, namely the main documentation and several books, but the first one is too overwhelming for new users, the examples are too short and all the books do not fit the release cycles of the Spring Framework.
Therefore, I will write all the small tips & tricks I know down here, hoping that it will be more than a knowledge collection for me.