Newbie can write bad code on any platform, but it‘s a short period of life of software developer - the problem of beginners is solved not by the tools they use, but through a reasonable composition of the team with sufficient number of experienced developers who can define the architecture and best practices.
From what I can tell, the "bad" Spring code is the code following the recommended Best Practices, at least according to the tutorials that pop up in Google search results.
There’s one “must read” tutorial - documentation on official Spring website. There’s also github account with lots of examples. It’s better to ignore the trash that comes from search results, because either it’s trivial or obsolete.
