@EJB in @ViewScoped @ManagedBean causes java.io.NotSerializableException

Asked 13/10, 2011 at 23:33 Answered 5/9, 2012 at 15:35

Solved serialization jsf-2 ejb myfaces managed-bean

I've read @EJB in @ViewScoped managed bean causes java.io.NotSerializableException, but my state saving setting is server.

Here is what I have:

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name>sispra</display-name>
    <welcome-file-list>
        <welcome-file>index.jsf</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
    </filter-mapping>

    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>server</param-value>
    </context-param>
    <context-param>
        <param-name>facelets.BUILD_BEFORE_RESTORE</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
        <param-value>false</param-value>
    </context-param>
    <context-param>
        <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>glass-x</param-value>
    </context-param>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Secure Application</web-resource-name>
            <url-pattern>/*</url-pattern>
            <http-method>GET</http-method>
            <http-method>POST</http-method>
        </web-resource-collection>
        <auth-constraint>
            <role-name>user</role-name>
        </auth-constraint>
    </security-constraint>
    <login-config>
        <auth-method>BASIC</auth-method>
        <realm-name>fileRealm</realm-name>
    </login-config>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
    <security-role>
        <role-name>user</role-name>
    </security-role>
</web-app>

customer.xhtml:

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">      

    <h:head>
        <title>TODO supply a title</title>
    </h:head>

    <h:body>

        <p:growl id="messages"/>

        <h:form>

            <p:commandButton actionListener="#{customerController.create}" value="save" update="@form :messages"/>

            <p:panel>
                <f:facet name="header">
                    <h:outputText value="Details"/>
                </f:facet>

                <h:panelGrid columns="3">

                    <h:outputLabel for="name" value="#{bundle['person.name']}"/>
                    <p:inputText id="name" label="#{bundle['person.name']}" value="#{customerController.selected.name}"/>
                    <p:message for="name"/>

                    <h:outputLabel for="surname" value="#{bundle['person.surname']}"/>
                    <p:inputText id="surname" label="#{bundle['person.surname']}" value="#{customerController.selected.surname}"/>
                    <p:message for="surname"/>

                </h:panelGrid>
            </p:panel>

        </h:form>

    </h:body>
</html>

CustomerController.java:

package it.shape.sispra.controllers;

import it.shape.sispra.ejb.PersonFacade;
import it.shape.sispra.entities.Customer;
import javax.ejb.EJB;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;

@ManagedBean
@ViewScoped
public class CustomerController extends AbstractController<Customer>
{
    private static final long serialVersionUID = 134755304347034L;

    @EJB
    private PersonFacade facade;

    public CustomerController()
    {
        super(Customer.class);
    }

    @Override
    public PersonFacade getFacade()
    {
        return facade;
    }
}

PersonFacade.java:

package it.shape.sispra.ejb;

import it.shape.sispra.entities.Person;
import javax.ejb.Stateless;

@Stateless
public class PersonFacade extends AbstractFacade<Person>
{
    private static final long serialVersionUID = 4357823648345L;

    public PersonFacade()
    {
        super(Person.class);
    }

}

AbstractFacade.java:

package it.shape.sispra.ejb;

import it.shape.sispra.entities.AbstractEntity;
import java.io.Serializable;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.eclipse.persistence.jpa.JpaHelper;
import org.eclipse.persistence.queries.QueryByExamplePolicy;
import org.eclipse.persistence.queries.ReadAllQuery;
import org.eclipse.persistence.queries.ReadObjectQuery;

public abstract class AbstractFacade<T extends AbstractEntity> implements Serializable
{
    private static final long serialVersionUID = 12467890452346123L;

    @PersistenceContext(unitName = "sispra")
    private EntityManager em;

    private final Class<T> entityClass;

    public AbstractFacade(Class<T> entityClass)
    {
        this.entityClass = entityClass;
    }

    public EntityManager getEntityManager()
    {
        return em;
    }

    public void create(T entity)
    {
        getEntityManager().persist(entity);
    }

    public void edit(T entity)
    {
        getEntityManager().merge(entity);
    }

    public void remove(T entity)
    {
        getEntityManager().remove(getEntityManager().merge(entity));
    }

    public void refresh(T entity)
    {
        getEntityManager().refresh(entity);
    }

    public T find(Object id)
    {
        return getEntityManager().find(entityClass, id);
    }

    public List<T> findAll()
    {
        CriteriaQuery<T> cq = getEntityManager().getCriteriaBuilder().createQuery(entityClass);
        cq.select(cq.from(entityClass));

        return getEntityManager().createQuery(cq).getResultList();
    }

    public List<T> findRange(int first, int max)
    {
        CriteriaQuery<T> cq = getEntityManager().getCriteriaBuilder().createQuery(entityClass);
        cq.select(cq.from(entityClass));

        TypedQuery<T> q = getEntityManager().createQuery(cq);
        q.setMaxResults(max);
        q.setFirstResult(first);

        return q.getResultList();
    }

    public int count()
    {
        CriteriaQuery<Long> cq = getEntityManager().getCriteriaBuilder().createQuery(Long.class);
        Root<T> rt = cq.from(entityClass);
        cq.select(getEntityManager().getCriteriaBuilder().count(rt));
        TypedQuery<Long> q = getEntityManager().createQuery(cq);
        return q.getSingleResult().intValue();
    }

    @SuppressWarnings("unchecked")
    public T findByExample(T entity)
    {
        // Create a native EclipseLink query using QBE policy
        QueryByExamplePolicy policy = new QueryByExamplePolicy();
        policy.addSpecialOperation(String.class, "like");

        ReadObjectQuery roq = new ReadObjectQuery(entity, policy);

        // Wrap the native query in a standard JPA Query and execute it
        Query query = JpaHelper.createQuery(roq, getEntityManager());

        return (T) query.getSingleResult();
    }

    @SuppressWarnings("unchecked")
    public List<T> findAllByExample(T entity)
    {
        // Create a native EclipseLink query using QBE policy
        QueryByExamplePolicy policy = new QueryByExamplePolicy();
        policy.addSpecialOperation(String.class, "like");

        ReadAllQuery raq = new ReadAllQuery(entity, policy);

        // Wrap the native query in a standard JPA Query and execute it
        Query query = JpaHelper.createQuery(raq, getEntityManager());

        return query.getResultList();
    }

    @SuppressWarnings("unchecked")
    public List<T> findByExample(T entity, int start, int max)
    {
        // Create a native EclipseLink query using QBE policy
        QueryByExamplePolicy policy = new QueryByExamplePolicy();
        policy.addSpecialOperation(String.class, "like");

        ReadAllQuery raq = new ReadAllQuery(entity, policy);

        // Wrap the native query in a standard JPA Query and execute it
        Query query = JpaHelper.createQuery(raq, getEntityManager());
        query.setFirstResult(start);
        query.setMaxResults(max);

        return query.getResultList();
    }

    public int countByExample(T entity)
    {
        //TODO find a better way...
        return findAllByExample(entity).size();
    }
}

and this is the stacktrace:

GRAVE: Exiting serializeView - Could not serialize state: com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate
java.io.NotSerializableException: com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
  at java.util.HashMap.writeObject(HashMap.java:1001)
  at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
  at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1346)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1154)
  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
  at java.util.HashMap.writeObject(HashMap.java:1001)
  at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
  at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1346)
  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1154)
  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
  at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.serializeView(ServerSideStateCacheImpl.java:357)
  at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.saveSerializedViewInServletSession(ServerSideStateCacheImpl.java:220)
  at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.saveSerializedView(ServerSideStateCacheImpl.java:798)
  at org.apache.myfaces.renderkit.html.HtmlResponseStateManager.saveState(HtmlResponseStateManager.java:127)
  at org.apache.myfaces.application.StateManagerImpl.saveView(StateManagerImpl.java:166)
  at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1554)
  at org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:281)
  at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85)
  at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239)
  at javax.faces.webapp.FacesServlet.service(FacesServlet.java:191)
  at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
  at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
  at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
  at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
  at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
  at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
  at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
  at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
  at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
  at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
  at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
  at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
  at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
  at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
  at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
  at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
  at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
  at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
  at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
  at java.lang.Thread.run(Thread.java:662)

I know I can workaround this by declaring PersonFacade as transient and use JNDI to get EJB reference after recontruction, but I really dislike this approach.

Is it possible that Glassfish 3.1.1 provides non-serializable EJBs? Is there a way to use @EJB and @ViewScoped together?

update: i found that this is a MyFaces related issue, all is working fine using mojarra

Vancevancleave answered 13/10, 2011 at 23:33 Comment(3)

I gather that AbstractFacade<T> implements Serializable? – Implement 14/10, 2011 at 0:30

yes, just edit post with AbstractFacade code too :) – Vancevancleave 14/10, 2011 at 7:15

however, setting @SessionScoped will work. how can this happen? if i am right, @SessionScoped beans follow same serialization of @ViewScoped – Vancevancleave 14/10, 2011 at 7:24

:) I had the same problem: https://issues.apache.org/jira/browse/MYFACES-3581

David Blevins over at the Apache TomEE helped me a log a bug and patch for MyFaces. The problem was generated proxy classes aren't on the classloader path for their deserializer.

A workaround is to set this web-app param to false: org.apache.myfaces.SERIALIZE_STATE_IN_SESSION

Splayfoot answered 5/9, 2012 at 15:35 Comment(0)

I have seen the problem too. What I have done in the past is split my bean into a StateBean which is @ViewScoped and an ActionsBean which is @RequestScoped. The ActionBean is injected with the StateBean as well as any EJBs or non-serializable resource accessing objects. On the front-end you use the StateBean for accessing properties and ActionsBean for performing actions.

I would love to hear from someone else who would make my "bean splitting" pattern deprecated.

This is an example of what I do:

@ManagedBean
@ViewScoped
public class CustomControllerStateBean implements Serializable {

  private static final long serialVersionUID = 134755304347034L;

  private Person selected;

  public Person getSelected() {
    return selected;
  }

  public void setSelected(Person selected) {
    this.selected = selected;
  }
}

Notice CustomControllerStateBean is @ViewScoped and is Serializable an only contains Serializable objects.

@ManagedBean
@RequestScoped
public class CustomControllerActionsBean {

  @EJB
  private PersonFacade facade;
  @Inject
  private CustomControllerStateBean state;

  public void create() {
    facade.create(state.getSelected());
  }
}

Notice CustomControllerActionsBean is @RequestScoped and is NOT Serializable an contains non-Serializable objects.

Your front-end will no look like this:

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">      

    <h:head>
        <title>TODO supply a title</title>
    </h:head>

    <h:body>

        <p:growl id="messages"/>

        <h:form>

            <p:commandButton actionListener="#{customerControllerActionsBean.create}" value="save" update="@form :messages"/>

            <p:panel>
                <f:facet name="header">
                    <h:outputText value="Details"/>
                </f:facet>

                <h:panelGrid columns="3">

                    <h:outputLabel for="name" value="#{bundle['person.name']}"/>
                    <p:inputText id="name" label="#{bundle['person.name']}" value="#{customerControllerStateBean.selected.name}"/>
                    <p:message for="name"/>

                    <h:outputLabel for="surname" value="#{bundle['person.surname']}"/>
                    <p:inputText id="surname" label="#{bundle['person.surname']}" value="#{customerControllerStateBean.selected.surname}"/>
                    <p:message for="surname"/>

                </h:panelGrid>
            </p:panel>

        </h:form>

    </h:body>
</html>

Notice CustomControllerActionsBean is used at the top in the p:commandButton and CustomControllerStateBean is used in the p:inputTexts.

Mure answered 13/4, 2012 at 17:38 Comment(12)

drawback is that you need to split every ViewScoped controller and it requires a lot of refactoring effort. however this is a nicer workaround than EJB lookup, so deserves a +1 :) thx – Vancevancleave 14/4, 2012 at 10:39

You do have to split everything. In my experience it isn't always bad. Having state and actions separate helps keep things clean. I don't have huge beans anymore. However, sometimes splitting small beans makes it less readable. In those instances, it is very annoying. – Mure 16/4, 2012 at 19:52

Nice workaround... although I don't understand why the OP doesn't work. – Splayfoot 7/7, 2012 at 1:34

@exabrial The problem is @ViewScoped beans are stored in the session and anything stored in the session is supposed to be Serializable. CustomerController isn't Serializable, so it can't be ViewScoped. I split my code so that everything that isn't Serializable is RequestScoped, so that they don't need to be Serializable. – Mure 9/7, 2012 at 8:8

My EJBs are serializable, so they can be passivated on demand. Take a look at this too: issues.apache.org/jira/browse/MYFACES-3581 – Splayfoot 9/7, 2012 at 14:39

@Mure CustomerController is Serializable, just as contained EJB. my problem was about this: how is it possible that a Serializable Object cannot be serialized? – Vancevancleave 5/9, 2012 at 10:33

@exabrial put this link in a new answer and i'll accept it :) – Vancevancleave 5/9, 2012 at 10:36

@animanera To be truly Serializable, it requires more than just adding the interface Serializable to a class. By default, Java will try to serialize a class by serializing all fields that aren't transient. So all fields of a class also will need to be serializable. If they aren't you can see serializable exceptions similar to what you are seeing. You can override the default mechanism to how your class is serialized by overriding writeObject(), readObject(), and/or readObjectNoData(). I could be mistaken, but I don't think EntityManager is serializable. Could you move it to an EJB? – Mure 26/10, 2012 at 3:34

@Mure each object contained in my EJB should be serializable, but you are right EntityManager (and in my case org.eclipse.persistence.internal.jpa.EntityManagerImpl and every parent interface) does NOT implement Serializable. this is very strange. maybe EJB generated proxy have a transient reference to injected EntityManager. i can't move it to EJB since i changed my business model and now i'm using mojarra without problem. but i'm sure that mojarra let me inject it in a parent class while myfaces don't. how can this be possible if the EJB container is the same?? – Vancevancleave 26/10, 2012 at 8:26

@animanera you are verging on the edge of my knowledge. The invisible magic that could be affecting things is proxies. With a lot of these frameworks that handle scoping, they proxy most all of the classes. They normally create a singleton proxy that is injected and the proxy determines the correct delegate based upon the scope. The proxy can be smart enough to handle serialization. This is where my experience ends. I have never checked the proxying code, so the times I thought the proxy was doing it, it could have been something else. However, I don't see why a proxy couldn't do it. – Mure 26/10, 2012 at 12:46

@MicheleMariotti: The EJB container might be the same, but then there is a concept of shallow & deep copy. – Clo 13/4, 2016 at 11:29

@MicheleMariotti: On the server side, the state can be stored as a shallow or a deep copy. In a shallow copy, state is not serialized in the session (JSF stores only pointers to the state in a session and only the container deals with serialization stuff), which requires less memory and allows you to inject EJBs in the view scoped beans (use this technique carefully, since the changes that affect objects in one copy will be reflected in the rest of the copies). The deep copy represents a full serialization of the state in a session, which requires more memory and doesn't allow injecting EJBs. – Clo 13/4, 2016 at 11:29

:) I had the same problem: https://issues.apache.org/jira/browse/MYFACES-3581

David Blevins over at the Apache TomEE helped me a log a bug and patch for MyFaces. The problem was generated proxy classes aren't on the classloader path for their deserializer.

A workaround is to set this web-app param to false: org.apache.myfaces.SERIALIZE_STATE_IN_SESSION

Splayfoot answered 5/9, 2012 at 15:35 Comment(0)

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