Re: GWT RPC Serialization - circular references not allowed?

2011-02-17 Thread Paul Robinson 

Circular references over RPC do generally work, but when it comes to hash maps 
and hash sets, it doesn't always work out-of-the-box.

See this issue for details, and a work-around:
http://code.google.com/p/google-web-toolkit/issues/detail?id=3577

Paul


On 17/02/11 18:14, Karthik Abram 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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Re: GWT RPC Serialization - circular references not allowed?

2011-02-17 Thread kabram 
This is using GWT 2.1.1 with JDK 1.6

On Feb 17, 1:14 pm, Karthik Abram  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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GWT RPC Serialization - circular references not allowed?

2011-02-17 Thread Karthik Abram 
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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