java无安全管理器：RMI类加载程序已禁用

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我想打电话给RMI，但有例外。怎么了

Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.lang.ClassNotFoundException: test.Hello (no security manager: RMI class loader disabled) at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source) at java.rmi.Naming.lookup(Unknown Source) at com.xx.rmiproxy.RmiProxy.call(RmiProxy.java:39) at com.xx.rmiproxy.RmiProxy.main(RmiProxy.java:18) Caused by: java.lang.ClassNotFoundException: test.Hello (no security manager: RMI class loader disabled) at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source) at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)

public String call(String rmiId, String json) throws Exception{

    RmiInterfaceDescription desc = dao.getDescriptionById(rmiId);
    desc.setJarFile("d:\\test.jar");

    RmiClientClassLoader rmiClassLoader = new RmiClientClassLoader(null,desc);

    Class interfaceClass = rmiClassLoader.loadClass(desc.getInterfaceName());
    List<String> paraClasses = desc.getParaClasses();

    Class returnClass = rmiClassLoader.loadClass(desc.getReturnClass());

    Object obj = Naming.lookup(desc.getRmiUrl());

    Class[] parameterTypes = new Class[paraClasses.size()];

    for(int i=0;i<paraClasses.size();i++){
        parameterTypes[i]= rmiClassLoader.loadClass(paraClasses.get(i));
    }

    Method method = interfaceClass.getDeclaredMethod(desc.getMethodName(),
            parameterTypes);

    Object params[] = parseParamsFromJson();
    Object result = method.invoke(obj, "ssd");


    return encode(result);
}

public class RmiClientClassLoader extends URLClassLoader {
public static void main(String args[]) throws Exception {
    RmiInterfaceDescription description = new RmiInterfaceDescription();

    description.setJarFile("d:\\test.jar");
    RmiClientClassLoader cl = new RmiClientClassLoader(null, description);

    Class clientClass = cl.loadClass("test.client.HelloClient");
}

private String basedir;
private RmiInterfaceDescription description;

@SuppressWarnings("deprecation")
public RmiClientClassLoader(String basedir,
        RmiInterfaceDescription description) throws MalformedURLException {
    super(new URL[] { new File(description.getJarFile()).toURL() });
    this.basedir = basedir;
    this.description = description;

}

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java无安全管理器：RMI类加载程序已禁用

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