I've sometimes this exception : why?

Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer
(ServerSerializationStreamWriter.java:696)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:659)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:593)
    at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
$ValueWriter$8.write(ServerSerializationStreamWriter.java:146)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue
(ServerSerializationStreamWriter.java:530)
    at com.google.gwt.user.server.rpc.RPCCopy_GWT15.encodeResponse
(RPCCopy_GWT15.java:597)
    at
com.google.gwt.user.server.rpc.RPCCopy_GWT15.encodeResponseForSuccess
(RPCCopy_GWT15.java:429)
    at com.google.gwt.user.server.rpc.RPCCopy.encodeResponseForSuccess
(RPCCopy.java:154)
    at net.sf.gilead.gwt.PersistentRemoteService.processCall
(PersistentRemoteService.java:157)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
(RemoteServiceServlet.java:86)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter
(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter
(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke
(StandardWrapperValve.java:230)
    at org.apache.catalina.core.StandardContextValve.invoke
(StandardContextValve.java:175)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke
(SecurityAssociationValve.java:179)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke
(JaccContextValve.java:84)
    at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke
(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke
(CachedConnectionValve.java:157)
    at org.apache.catalina.core.StandardEngineValve.invoke
(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:262)
    at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol
$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run
(JIoEndpoint.java:446)
    at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.GeneratedMethodAccessor128.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer
(ServerSerializationStreamWriter.java:678)
    ... 30 more
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type
'com.zensistemi.zeno.model.ordini.StoricoVenduto_gilead_15' was not
included in the set of types which can be serialized by this Seriali
zationPolicy or its Class object could not be loaded. For security
purposes, this type will not be serialized.
    at
com.google.gwt.user.server.rpc.impl.StandardSerializationPolicy.validateSerialize
(StandardSerializationPolicy.java:83)
    at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:591)
    at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
    at
com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize
(Collection_CustomFieldSerializerBase.java:43)
    at
com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize
(ArrayList_CustomFieldSerializer.java:36)
    ... 34 more

I dont' understand....

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