classloader - two jars with different versions of same classes

cload.java

public class Main {
    public static void main(String[] args) {
        Main m = new Main();
        TestClassIface t1 = m.load("test/1.jar");
        TestClassIface t2 = m.load("test/2.jar");
        t1.execute();
        t2.execute();
    }
    TestClassIface load(String path) {
        try {
            System.out.println(new File(path).canRead());
            ClassLoader cl1 = new URLClassLoader(new URL[] { new File(path).toURL()});
            Class<?> cls = cl1.loadClass("Test");
            return (TestClassIface) cls.newInstance();
        } catch (MalformedURLException | IllegalAccessException | ClassNotFoundException | InstantiationException e) {
            e.printStackTrace();
        }
        return null;
    }
}