问题
It is said that java 9 modules will solve classpath hell. However, I am thinking about the following situation: Module A uses modules B and C. Both modules will export a class with same name and package. How will the classloading issue be solved here?
回答1:
This situation is forbidden in the Java 9 module system. If two modules in the same layer have the same package, Java 9 will fail at startup with an error:
java.lang.LayerInstantiationException:
Package <package_name> in both module <moduleB_name> and module <moduleC_name>
来源：https://stackoverflow.com/questions/44086361/java-9-modules-and-classpath-hell-conflicting-class-names