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public class John implements BasicLibraryService {

    public boolean basicLoad(Ruby ruby) throws IOException {
        RubyModule module = ruby.getModule("MyRubyModule");
        module.defineAnnotatedMethods(JohnExtension.class);

        return true;
    }

}

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public class JohnExtension {

    @JRubyMethod(name="my_method")
    public static String myMethod(String html, String namespace) {
        return "hello world";
    }

}