When it comes to problem solving, there are two main approaches that we commonly use—the top-down approach and the bottom-up approach. Not surprisingly, those approaches are applicable in the web service world as well. In the web service world, the two approaches have been given different names but the concepts remain the same:
Code first approach: It is the same as the bottom-up approach, where we first start with the source code and eventually expose our source code as a web service. More concretely, the code first approach helps to easily convert an existing application into a web service. In general, this approach reduces the learning curve, where a user does not need to have a very good understanding of the web service concepts, having a fair understanding of how a specific framework works would help to easily achieve the goal. POJO or Plain Old Java Object is one of the very good examples of the code first approach. Notably, with the code first approach, you...