Re: GWT RPC Serialization - circular references not allowed?

[kabram]

This is using GWT 2.1.1 with JDK 1.6

On Feb 17, 1:14 pm, Karthik Abram <karthik.ab...@gmail.com> wrote:
> I'm serializing to the client from Java using the standard GWT RPC
> mechanism (using Async Service, not the factory introduced in 2.1).
> I'm seeing an issue with deserialization at the client when my
> serialized object has circular references. This is what I see:
>
> Serializing a "Result" object that has a "Fund" object reference. This
> fund has a reference to a "Distributor" object that contains a list of
> Funds, one of which is the same as the Fund that result references. So
> it is a two-hop circular reference.
>
> The Fund object's hashCode method is overridden to use the fund-id's
> hashcode (fund-id is a string). The error I get is that the hashcode
> threw a NullPointerException.
>
> Here is the stacktrace:
> at com.foo.dm.fund.Fund.hashCode(Fund.java:709)
>         at java.util.HashMap.put(HashMap.java:372)
>         at java.util.HashSet.add(HashSet.java:200)
>         at 
> com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSeriali­zerBase.deserialize(Collection_CustomFieldSerializerBase.java:35)
>         at 
> com.google.gwt.user.client.rpc.core.java.util.HashSet_CustomFieldSerializer­.deserialize(HashSet_CustomFieldSerializer.java:32)
>         at 
> com.google.gwt.user.client.rpc.core.java.util.HashSet_FieldSerializer$Handl­er.deserialize(HashSet_FieldSerializer.java:11)
>         at 
> com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBa­se.java:91)
>         at 
> com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deseria­lize(ClientSerializationStreamReader.java:108)
>         at 
> com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readO­bject(AbstractSerializationStreamReader.java:119)
>         at 
> com.foo.dm.user.Distributor_FieldSerializer.deserialize(Distributor_FieldSe­rializer.java:42)
>
> Are circular references not allowed? I can't believe this is the first
> time I'm running across this in 2 years!

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