Spring 3 - Как правильно настроить сохранение сеансов?

Question

В Jetty настроено сохранение сеанса. Простой пример с Spring Security и JSP-страницей работает нормально. Сессия восстанавливается после перезапуска сервера, я все еще аутентифицирована. Но после использования EntityManager и некоторых компонентов Spring у меня появляется исключение при запуске:

java.lang.IllegalStateException: Cannot deserialize BeanFactory with id org.springframework.web.context.WebApplicationContext:/MyApp: no factory registered for this id
    at org.springframework.beans.factory.support.DefaultListableBeanFactory$SerializedBeanFactoryReference.readResolve(DefaultListableBeanFactory.java:955)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1061)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1762)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
    at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:480)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.readObject(SharedEntityManagerCreator.java:267)

Похоже, проблема, связанная с EntityManager.

 2010-06-25 09:35:55.906:INFO:/MyApp:Initializing Spring root WebApplicationContext null null

только после исключения