GWT 2.0 serialization policy file

[Oleg K.]

Hi all.

I have the following problem.

My project tries to use GWT RPC.

It has one jar in dependency libs which contain several model classes.
All of that classes implements Serializable and IsSerializable
interfaces (one of that classes is CHAttrGroup). That jar also
includes .java files with source code and Module.gwt.xml file so that
model classes can be used in main GWT application by including
<inherits name="...." />.

GWT compiler (2.0-rc1) doesn't write error messages when building
application and all that model classes (e.g. CHAttrGroup) work
correctly in client-side code (like other gwt client classes). But
when I try to send objects of that class from server to client I get
following exception:

2009-11-22 02:34:49.688:tasktrackgwt: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:760)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:723)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:612)
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:152)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue
(ServerSerializationStreamWriter.java:534)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass
(ServerSerializationStreamWriter.java:700)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl
(ServerSerializationStreamWriter.java:730)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:612)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject
(AbstractSerializationStreamWriter.java:129)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue
(ServerSerializationStreamWriter.java:534)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:607)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess
(RPC.java:465)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
(RPC.java:562)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall
(RemoteServiceServlet.java:188)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost
(RemoteServiceServlet.java:224)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost
(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.google.inject.servlet.ServletDefinition.doService
(ServletDefinition.java:216)
at com.google.inject.servlet.ServletDefinition.service
(ServletDefinition.java:141)
at com.google.inject.servlet.ManagedServletPipeline.service
(ManagedServletPipeline.java:93)
at com.google.inject.servlet.FilterChainInvocation.doFilter
(FilterChainInvocation.java:63)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch
(ManagedFilterPipeline.java:122)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:
110)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle
(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle
(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
536)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:930)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:747)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run
(QueuedThreadPool.java:582)
Caused by: java.lang.reflect.InvocationTargetException
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:742)
... 42 more
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type
'ru.codehouse.tasktrack.model.objects.CHAttributeGroup' 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.: instance =
ru.codehouse.tasktrack.model.objects.CHAttributeGroup[id=10]
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize
(ServerSerializationStreamWriter.java:610)
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)
... 47 more


GWT serialization policy file contains following line:

ru.codehouse.tasktrack.model.objects.CHAttribute, false, false, true,
true, ru.codehouse.tasktrack.model.objects.CHAttribute/3607536941,
3607536941

which tells us that field and instant serialization is not permitted
(first, and second 'false's) and that field and instance
deserialization is permitted (3rd and 4th 'true's).

How can I enable serialization of my model objects ?

[rla...@googlemail.com]

Hi Oleg,

i'm facing the same problem for 5 days now... Can you tell me please
how you solved it?

Many thanks in advance

Rodrigue

[Dan]

Is this the problem with the classes you want to serialize not having
a no arguments constructor?

On Nov 21, 11:56 pm, "Oleg K." <seq...@gmail.com> wrote:
> Hi all.
>
> I have the following problem.
>
> My project tries to use GWT RPC.
>
> It has one jar in dependency libs which contain several model classes.
> All of that classes implements Serializable and IsSerializable
> interfaces (one of that classes is CHAttrGroup). That jar also
> includes .java files with source code and Module.gwt.xml file so that
> model classes can be used in main GWT application by including
> <inherits name="...." />.
>
> GWT compiler (2.0-rc1) doesn't write error messages when building
> application and all that model classes (e.g. CHAttrGroup) work
> correctly in client-side code (like other gwt client classes). But
> when I try to send objects of that class from server to client I get
> following exception:
>
> 2009-11-22 02:34:49.688:tasktrackgwt: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.seriali zeWithCustomSerializer
> (ServerSerializationStreamWriter.java:760)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali zeImpl
> (ServerSerializationStreamWriter.java:723)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:612)
>         at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write Object

> (AbstractSerializationStreamWriter.java:129)
>         at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
> $ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
>         at

> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali zeValue
> (ServerSerializationStreamWriter.java:534)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali zeClass
> (ServerSerializationStreamWriter.java:700)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali zeImpl
> (ServerSerializationStreamWriter.java:730)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:612)
>         at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write Object

> (AbstractSerializationStreamWriter.java:129)
>         at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
> $ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
>         at
> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali zeValue

> com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali ze
> (ServerSerializationStreamWriter.java:610)
>         at
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write Object
> (AbstractSerializationStreamWriter.java:129)
>         at
> com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSeriali zerBase.serialize
> (Collection_CustomFieldSerializerBase.java:43)
>         at
> com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializ er.serialize

[Rodrigue Lagoue]

hi!

No my classes have a no arguments constructors. There are just defined in another project. The GWT project uses it from a jar file.

Thanks

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[Rodrigue Lagoue]

It's really frustrating. since the error tells: "Type 'java.lang.Boolean' 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.: instance = true"

When i try to make the following generic rpc call

@RemoteServiceRelativePath("testService")

public interface TestService extends RemoteService {

public <T extends Response<V>, V extends Serializable, D extends Serializable> T execute(

Action<T, V, D> action);

}

here is the implementation:

@SuppressWarnings("serial")

public class TestServiceImpl extends RemoteServiceServlet implements

TestService {

@SuppressWarnings("unchecked")

@Override

public <T extends Response<V>, V extends Serializable, D extends Serializable> T execute(

Action<T, V, D> action) {

System.out.println("action.data: " + action.toString());

DefaultResponse<Boolean> result = new DefaultResponse<Boolean>();

result.value = Boolean.TRUE;

return (T) result;

}

}

Thanks

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