RPC: Error when deserialize a Set

[thangenius]

When making a RPC, GWT cannot deserialize a Set (HashSet as
implementation). In MyBean class, I declare a Set of MyCustomType:

public class MyBean {
/**
* @gwt.typeArgs <mypackage.CampaignAssignment>
*/
Set assignments;

public MyBean() {
assignment = new HashSet();
}
}

When making a RPC and pass this bean as a parameter, the following
error occurs:

[WARN] StandardContext[]Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException:
java.lang.reflect.InvocationTargetException
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:589)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:290)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:186)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
Caused by: java.lang.reflect.InvocationTargetException: null
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:572)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:290)
Caused by: java.lang.NumberFormatException: For input string: "~"
at
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:447)
at java.lang.Integer.parseInt(Integer.java:497)
at
com.google.gwt.user.client.rpc.SerializationStream.readInt(SerializationStream.java:109)
at
com.google.gwt.user.client.rpc.core.java.util.HashSet_CustomFieldSerializer.deserialize(HashSet_CustomFieldSerializer.java:51)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserizeWithCustomSerializer(ServerSerializationStream.java:572)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:512)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeClass(ServerSerializationStream.java:468)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserialize(ServerSerializationStream.java:519)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.readObject(ServerSerializationStream.java:443)
at
com.google.gwt.user.server.rpc.ServerSerializationStream.deserializeValue(ServerSerializationStream.java:411)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:290)

[Rudy Jahchan]

We are having the exact same problem. If we create a HashSet and set it
as the set instance, serialization fails with a NumberFormatException.
This occurs whether the set is empty or has content.

It does not occur when the set is set to null. The bean serializes just
fine.

[Miguel Méndez]

This is a bug in the deserialization logic of the serializer for HashSet.  Your experience would be that a null HashSet would be fine but a HashSet instance, empty or not, could be serialized but not deserialized.  We are tracking this now.

Thanks,

--
Miguel Mendez
GWT Engineer

[dbev...@gmail.com]

Hi

I have a similar problem to this, except that I only see it in hosted
mode with my services on a separate Tomcat instance. Does that help?

Any idea if/when this will be fixed?

Thanks

Dominic

> ------=_Part_20284_21798085.1150285842506
> Content-Type: text/html; charset=ISO-8859-1
> Content-Transfer-Encoding: quoted-printable
> X-Google-AttachSize: 1001
>
> This is a bug in the deserialization logic of the serializer for HashSet.&nbsp; Your experience would be that a null HashSet would be fine but a HashSet instance, empty or not, could be serialized but not deserialized.&nbsp; We are tracking this now.
> <br><br>Thanks,<br><br><div><span class="gmail_quote">On 6/13/06, <b class="gmail_sendername">Rudy Jahchan</b> &lt;<a href="mailto:rudy.j...@gmail.com">rudy.j...@gmail.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
> <br>We are having the exact same problem. If we create a HashSet and set it<br>as the set instance, serialization fails with a NumberFormatException.<br>This occurs whether the set is empty or has content.<br><br>It does not occur when the set is set to null. The bean serializes just
> <br>fine.<br><br><br></blockquote></div><br><br clear="all"><br>-- <br>Miguel Mendez<br>GWT Engineer
>
> ------=_Part_20284_21798085.1150285842506--

[ste...@gmail.com]

I got the same problem now.

Has the bug been fixed?
where can I get the newest version or night build? is there a CVS to
update source?

regards,
steeven

[Miguel Méndez]

I apologize for the delayed response guys.  This bug will be fixed in the next release of GWT which we are working on as we speak.

Unfortunately, we do not have a CVS repository that is public nor do we release nightly builds at this time though this may change in the future.

Again, sorry for the silence on the line.

--
Miguel