me puedes ayudar seria de gran ayuda para mi

My first suspicion is the LightEntity inheritance. It looks like you are using Gilead. Are you following all the steps for whatever mode you’ve chosen (stateless, stateful, etc):

http://noon.gilead.free.fr/gilead/index.php?page=documentation

public class EmployeeList extends LightEntity implements IsSerializable
{
private static final long serialVersionUID = 1L;

private int emp_id;
private String firstname;
private String lastname;
private double total_consumption;

public EmployeeList()
{

}

public EmployeeList(int emp_id, String firstname, String lastname,
double total_consumption)
{
this.emp_id = emp_id;
this.firstname = firstname;
this.lastname = lastname;
this.total_consumption = total_consumption;
}

public int getEmpID()
{
return emp_id;
}

public void setEmpID(int emp_id)
{
this.emp_id = emp_id;
}

public String getFirstname()
{
return firstname;
}

public void setFirstname(String firstname)
{
this.firstname = firstname;
}

public String getLastname()
{
return lastname;
}

public void setLastname(String lastname)
{
this.lastname = lastname;
}

public double getTotalConsumption()
{
return this.total_consumption;
}

public void setTotalConsumption(int total_consumption)
{
this.total_consumption = total_consumption;
}
}

In the Service Implementation class:

@Override
public List generateReport(String reportItem, String positionItem)
{
List employeeList =
coDBManager.generateEmployeeReport(reportItem, positionItem);

return employeeList;
}

In my DBManager class:

public List generateEmployeeReport(String reportItem, String reportPosition)
{

Session session =
MyHibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

StringBuffer sql = new StringBuffer();
sql.append(“select employee.emp_id, employee.lastname, employee.firstname, ” +
“(select sum(itemdetails.amount) from Item item, ItemDetails itemdetails ” +
“where item.emp_id=employee.emp_id and item.id = itemdetails.itemid) as total_consumption ” +
“from Employee employee”);

Query query = null;
List result = null;

try
{
query = session.createQuery(sql.toString());
result = query.list();

session.getTransaction().commit();
}
catch (Exception e)
{
e.printStackTrace();
}

return result;
}

ERROR:

[WARN] 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$8.write(ServerSerializationStreamWriter.java:146)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:530)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponse(RPCCopy_GWT16.java:597)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponseForSuccess(RPCCopy_GWT16.java:429)
at com.google.gwt.user.server.rpc.RPCCopy.encodeResponseForSuccess(RPCCopy.java:193)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:157)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:678)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:659)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:593)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:146)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:530)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponse(RPCCopy_GWT16.java:597)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponseForSuccess(RPCCopy_GWT16.java:429)
at com.google.gwt.user.server.rpc.RPCCopy.encodeResponseForSuccess(RPCCopy.java:193)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:157)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type ‘[Ljava.lang.Object;’ was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.
at com.google.gwt.user.server.rpc.impl.StandardSerializationPolicy.validateSerialize(StandardSerializationPolicy.java:83)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:591)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:43)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:678)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:659)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:593)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:146)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:530)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponse(RPCCopy_GWT16.java:597)
at com.google.gwt.user.server.rpc.RPCCopy_GWT16.encodeResponseForSuccess(RPCCopy_GWT16.java:429)
at com.google.gwt.user.server.rpc.RPCCopy.encodeResponseForSuccess(RPCCopy.java:193)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:157)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

Awesome.

For everyone else, the code I suggested was a parameterized HashMap, like
Map map = new HashMap();

This replaced @gwt.typeArgs which used to be a javadoc annotation before GWT 1.4.

See http://code.google.com/docreader/#p=google-web-toolkit-doc-1-5&s=google-web-toolkit-doc-1-5&t=ReleaseNotes_1_5_ImportantNotes

for more.

I have tried using parametrized hashmap as moore suggested , my problem got fixed and the problem is no more reproducible.
thanks moore !!!.

I haven’t used 1.7.1 yet, but my first question would be, what are in those lists (featureNames, appShortcuts)? Are they standard java objects, or custom ones that you’ve created?