no security manager: RMI class loader disabled

Question

i like to call RMI,but the Exception is throwed.what's wrong with it?

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;

}

user207421 user207421 · Accepted Answer · 2013-12-18T10:45:10

You're looking at the wrong thing. The important part of this exception is the ClassNotFoundException and the class it names. Whatever class that is need to be deployed at the client, and available to the Registry if you're running it as a separate process.

I don't know why you're defining your own class loader. The codebase feature is generally sufficient.

no security manager: RMI class loader disabled

1 Answers