I can't compile program as below.
When I compiled it, error occured and it says

[ERROR] Type 'TestManager<TestImpl>' was not serializable and has no
concrete serializable subtypes


Is there any problem in the code ?

thanx


public interface ITest {
        int getId();
        String getName();
}
public class TestImpl implements ITest {
        public int getId() {
                return -1;
        }
        public String getName() {
                return "test";
        }
}
public class TestManager<E extends ITest> {
        private List<E> list;
}


public interface TestService extends RemoteService {
        TestManager<TestImpl> getTest();
}
public interface TestServiceAsync {
        void getTest(AsyncCallback<TestManager<TestImpl>> callback);
}
public class TestServiceImpl extends RemoteServiceServlet implements
TestService {
        public TestManager<TestImpl> getTest() {
                return null;
        }
}

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