jar javac java command with module

Automatic module do not have module-info.
but that is named automatically or we indicate module-name with manifest.mf.

AutoProject.java

public class AutoProject {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("i am auto module");
    }
    
}

NamedProject.java

public class NamedProject {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        AutoProject.main(null);
    }
    
}

make jar file of automatic module from classfiles.
you can use manifest.mf file , if you indicate module name
by using option -m.

C:\Users\java\Documents\NetBeansProjects> jar -cvfm AutoProject\dist\AutoProject.jar AutoProject\manifest.mf AutoProject\build\classes
マニフェストが追加されました
AutoProject/build/classes/を追加中です(入=0)(出=0)(0%格納されました)
AutoProject/build/classes/.netbeans_automatic_buildを追加中です(入=0)(出=0)(0%格納されました)
AutoProject/build/classes/.netbeans_update_resourcesを追加中です(入=0)(出=0)(0%格納されました)
AutoProject/build/classes/autoproject/を追加中です(入=0)(出=0)(0%格納されました)
AutoProject/build/classes/autoproject/AutoProject.classを追加中です(入=595)(出=365)(38%収縮されました)

named module reffers automatic module
named module is NamedModule
automatic module is AutoProject

C:\Users\java\Documents\NetBeansProjects\NamedProject\src>java --module-path C:\Users\java\Documents\NetBeansProjects\AutoProject\dist\AutoProject.jar;C:\Users\java\Documents\NetBeansProjects\NamedProject\dist\NamedProject.jar -m NamedModule
i am auto module

noname module can reffers named module .
we can use jar --add-modules option for indicate using named module.
In Addition, automatic module reffers named module , same as noname module reffers named module.

NonameProject.java

public class NonameProject {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        ChildProject.main(null);
        System.out.println("i am noname module");
    }
    
}

module-info.java

module ChildModule {
    exports childproject;
    requires ParentModule;
}

ChildProject.java

public class ChildProject {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Object o = Factory.create();
        try{
            Method m = o.getClass().getMethod("method");
            m.invoke(o);
            
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

C:\Users\java\Documents\NetBeansProjects> javac --module-path C:\Users\java\Documents\NetBeansProjects\ChildProject\dist\ChildProject.jar --add-modules ChildModule nonameproject\NonameProject.java
C:\Users\java\Documents\NetBeansProjects> java --module-path C:\Users\java\Documents\NetBeansProjects\ChildProject\dist\ChildProject.jar;C:\Users\java\Documents\NetBeansProjects\ParentProject\dist\ParentProject.jar --add-modules ChildModule nonameproject.NonameProject
 i am parentproject method
i am noname module

Automatic module refers noname module

C:\Users\java\Documents\NetBeansProjects\AutoProject\build\classes>java --class-path C:\Users\java\Documents\NetBeansProjects\NonameProject\dist\NonameProject.jar;. autoproject.AutoProject
i am noname module
i am auto module