Trouble: java.rmi.StubNotFoundException: Stub class not found: zad1.HelloImpl_Stub; nested exception is:
    java.lang.ClassNotFoundException: zad1.HelloImpl_Stub
java.rmi.StubNotFoundException: Stub class not found: zad1.HelloImpl_Stub; nested exception is:
    java.lang.ClassNotFoundException: zad1.HelloImpl_Stub
    at sun.rmi.server.Util.createStub(Util.java:297)
    at sun.rmi.server.Util.createProxy(Util.java:142)
    at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:226)
    at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:383)
    at java.rmi.server.UnicastRemoteObject.exportObject(UnicastRemoteObject.java:301)
    at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.exportObject(PortableRemoteObject.java:119)
    at javax.rmi.PortableRemoteObject.exportObject(PortableRemoteObject.java:100)
    at javax.rmi.PortableRemoteObject.<init>(PortableRemoteObject.java:84)
    at zad1.HelloImpl.<init>(HelloImpl.java:8)
    at zad1.HelloServer.main(HelloServer.java:12)
Caused by: java.lang.ClassNotFoundException: zad1.HelloImpl_Stub
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at sun.rmi.server.Util.createStub(Util.java:292)
    ... 9 more