Main-Class can't be set to existing class

I have a build setup that requires that my classes be put into a folder in a subdirectory of my current directory. I.E., if I'm at '.', then the classes could be in './somewhere_else/'

The problem is that when I do this I can't set a value for Main-Class that can find the main class. I have no problem when I build the jar from files at '.', but all the following atte开发者_C百科mpts for main class result in java.lang.NoClassDefFoundError's:

Main-Class: ClassName
Main-Class: FolderName.ClassName
Main-Class: FolderName/ClassName

What should I be using?

---

The classes inside your jar have to be in the same directory structure as your package structure.

• So, if you want to have your class ClassName (without any package) to be the main class, it has to be in the root directory of your jar.
• If you want to have the class in the directory FolderName, this same name has to be the package name, meaning the first (non-empty non-comment) line of your source file should be package FolderName;.

If your problem is only the build setup - this is not a problem, the folder-layout of your directories outside the jar does not necessarily have to be the same as the layout inside your jar. But it still helps if the folder-structure fits to the package-structure (with maybe additionally directories above).

---

I think you should reference Main-Class simply by the class name (without directory structure). What will help you solve this problem is what you put as the classpath. Make sure the directory of Main-Class is in the classpath.

---

If your ClassName resides in package FolderName, then, it should be:-

Manifest-Version: 1.0
Main-Class: FolderName.ClassName
Class-Path: <third-party>.jar <another-third-party>.jar

They are case-sensitive, by the way.