REST function error in create response

I have an EJB exposed as a REST web service. I'm using Wildfly 8.1.0.

If I deploy the ejb in the war, it work perfectly.
If i deploy it in a EAR, some method returns:

16:14:08,611 ERROR [io.undertow.request] (default task-9) UT005023: Exception handling request to /BssWebCore/webservice/esercizi/test: org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeException: JBAS014154: Failed to marshal EJB parameters
at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:76) [resteasy-jaxrs-3.0.8.Final.jar:]
at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:212) [resteasy-jaxrs-3.0.8.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:149) [resteasy-jaxrs-3.0.8.Final.jar:]
...
Caused by: java.lang.RuntimeException: JBAS014154: Failed to marshal EJB parameters
at org.jboss.as.ejb3.remote.LocalEjbReceiver.clone(LocalEjbReceiver.java:317) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.remote.LocalEjbReceiver.clone(LocalEjbReceiver.java:297) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.remote.LocalEjbReceiver.processInvocation(LocalEjbReceiver.java:254) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:184) [jboss-ejb-client-2.0.1.Final.jar:2.0.1.Final]
at org.jboss.ejb.client.EJBObjectInterceptor.handleInvocation(EJBObjectInterceptor.java:58) [jboss-ejb-client-2.0.1.Final.jar:2.0.1.Final]
...
Caused by: java.io.NotSerializableException: org.jboss.resteasy.specimpl.BuiltResponse
at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:247) [jboss-marshalling-1.4.9.Final.jar:1.4.9.Final]
at org.jboss.marshalling.cloner.SerializingCloner.clone(SerializingCloner.java:125) [jboss-marshalling-1.4.9.Final.jar:1.4.9.Final]
at org.jboss.as.ejb3.remote.LocalEjbReceiver.clone(LocalEjbReceiver.java:314) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
... 58 more

I have an abstract class
@PermitAll public abstract class AbstractFacade<T extends EntityBase> implements InterfacciaFacadeRemote<T>{ protected Class<T> entityClass; private static Logger LOG; protected abstract EntityManager getEntityManager(); ... @Override public T cerca(long id){ return getEntityManager().find(entityClass, id); } @Override public List<T> cercatutti() { javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery(); cq.select(cq.from(entityClass)); return getEntityManager().createQuery(cq).getResultList(); } @Override public int count() { javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery(); javax.persistence.criteria.Root<T> rt = cq.from(entityClass); cq.select(getEntityManager().getCriteriaBuilder().count(rt)); javax.persistence.Query q = getEntityManager().createQuery(cq); return ((Long) q.getSingleResult()).intValue(); } @Override public Long countFilterdRecords(FilterLogic logic, List<FilterForColumn> filtri){ CriteriaBuilder cb = getEntityManager().getCriteriaBuilder(); CriteriaQuery<Long> qcount = cb.createQuery(Long.class); Root<T> root = qcount.from(this.entityClass); qcount.select(cb.count(root)); // filtering --------------------------------------------------------------------- ... // crea query -------------------------------------------------------------------- TypedQuery<Long> numrec = getEntityManager().createQuery(qcount); try{ Long count = numrec.getSingleResult(); return count; }catch(NoResultException nre){ return (long) 0; } } @Override public Response testFacade(){ List<Map<String, String>> response = new ArrayList<>(); Response.ResponseBuilder rb = Response.ok(); Map<String,String> m = new HashMap<>(); m.put("tipo", "info"); m.put("classe", entityClass.getName()); response.add(m); m.clear(); m.put("tipo", "info");m.put("facade",this.getClass().getName()); rb.entity(response).build(); return rb.build(); } @Override public String getEntityClass() { return this.entityClass.getName(); }

that implements an interface:
@javax.ejb.Remote @PermitAll public interface InterfacciaFacadeRemote<T extends EntityBase> extends Serializable{ ... @POST @javax.ws.rs.Path("cerca") @Consumes(MediaType.APPLICATION_FORM_URLENCODED) @Produces(MediaType.APPLICATION_JSON) public T cerca(@FormParam("id") long id); @POST @javax.ws.rs.Path("cercatutti") @Produces(MediaType.APPLICATION_JSON) public List<T> cercatutti(); @GET @javax.ws.rs.Path("count") @Produces(MediaType.APPLICATION_JSON) public int count(); @GET @javax.ws.rs.Path("test") @Produces(MediaType.APPLICATION_JSON) public Response testFacade(); @POST @javax.ws.rs.Path("grid") @Consumes(MediaType.APPLICATION_FORM_URLENCODED) @Produces({MediaType.APPLICATION_JSON, MediaType.TEXT_PLAIN}) public Response getFilterdRecords(MultivaluedMap<String, String> formParams, @QueryParam("callback") String callback); @GET @javax.ws.rs.Path("entity") @Produces(MediaType.TEXT_PLAIN) public String getEntityClass(); }

The ejbs extends the the abstract class.

If I extends this superclass in a WAR, the method return the correct answer for all methods.

If I extends this superclasses in a EAR, the method cerca and cercatutti return the correct answer: they search the records in the database and then they return the list of entity as a JSON array using the JAXB marshaling .
But if I use a more simple function like getEntityClass or test (they return a string or a list of mapped value) I receive the error.

I think that the entity are coded in json well becase i see them with the method cercatutti (findall), but also the string are coded well because they work in the other project.

What did I forget? Is there something that i can try or test?