The main issue with Java-based projects (possibly using Spring) is the amount of existing resources: there are thousands/millions of example projects, code snippets, answers on StackOverflow etc. and majority of them is very old (as far as software development is considered). Even fresh resource are often using outdated techniques.
Modern Java is pretty good (although Kotlin is a bit cleaner IMO), but you should really use Spring documentation (if you are using Spring) and avoid code snippets from SO/Github.
Modern Java is pretty good (although Kotlin is a bit cleaner IMO), but you should really use Spring documentation (if you are using Spring) and avoid code snippets from SO/Github.