Created attachment 100760 [details]
Module suite to show the enum dependency problem

1. Define a public enum in a private package  in a module of a module suite
2. Use this enum in a package of another module of the module suite
  -> It is possible to import the enum 
  -> The IDE does not show any error badges
  -> The compiler compiles it without problems
  -> Only when starting the program and trying to use the enum an exception appears.

Reason for this incorrect behaviour is that the enum is inside the 
build/public-package-jars/module.jar file.

I created an attachment with an example module suite named EnumTest for this problem containing two modules:

1. The first module named LibMod contains two packages
   a. libmod.api  which is public in the module. This package contains 
      the public class ApiTest.
   b. libmod.priv which is private in the module. This package contains
      the public enum PrivateEnum.
2. The second module named Main contains one package named test. The module defines a dependency to the LibMod Module. It contains a class named TestClass in which it is possible to define and compile a variable of type ApiTest (which is correct) and of enum PrivateEnum (which is wrong).