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    <p>It looks like your problem is here:</p> <pre><code> Class&lt;?&gt; c= klass.forName("Foo"); Method method = c.getDeclaredMethod ("getNome", String.class); System.out.println(method.invoke(c)); </code></pre> <p><code>klass.forName("Foo")</code> is actually equivalent to <code>Class.forName("Foo")</code>, which results in <code>Class.forName("Foo", nclass.class.getClassLoader());</code>.</p> <p>The class loader which loaded <code>nclass</code> obviously does not know a <code>Foo</code> class, since it was created by your anonymous class loader (which is a child of this class loader). So, don't use this <code>forName</code> call here, but simply use your <code>klass</code> object to get the method and invoke it.</p> <hr> <p>And of course, invoking and retrieving a method works not like you did.</p> <ul> <li><p>The <code>getMethod</code> and <code>getDeclaredMethod</code> take beside the name a list of argument types (not return types) - in your case <code>getNome</code> has no arguments, so it should be:</p> <pre><code>Method method = klass.getDeclaredMethod ("getNome"); </code></pre></li> <li><p>the invoke methods first argument is an object of the methods receiving type (<code>Foo</code> in your case), or <code>null</code> for static methods. The following arguments are the parameters to the method (i.e. none in your case). So you should use here:</p> <pre><code>System.out.println(method.invoke(null)); </code></pre> <p>It may be that the argument is simply ignored in your case, so <code>c</code> might not get an error. But there still is no reason to use a class object here, if you are not actually invoking a method of class <code>Class</code> by reflection.</p></li> </ul> <p>This all is assuming your error occurs in your <code>forName</code> call and not already earlier. Please learn to describe your error message, so we don't have to guess.</p>
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    1. COi found a bug, i messed some declarations "simple" and "Foo" and then resulting in a error, thanks for your quick explanation! ...
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