WrongPackageStatement

Detects package statements that do not correspond to the project directory structure. Also, reports classes without package statements if the class is not located directly in source root directory.

While it's not strictly mandated by Java language, it's good practise to keep classes from package com.example.myapp inside a com/example/myapp directory directly under a source root. Failure to do this may confuse code readers and make some tools work incorrectly.