[jira] [Commented] (DIRMINA-930) Problems with ObjectSerializationCodecFactory using MINA in between Java 6 and Java 7

["Emmanuel Lecharny (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DIRMINA-930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122869#comment-14122869 ] 

Emmanuel Lecharny commented on DIRMINA-930:
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It's quite clear : serializing an instance using Java 6 won't be deserialized by a Java 7 server (and it fails both ways).

Here, I would suggest not to use the ObjectSerializationCodecFactory which is clearly Java version dependent, but instead write your own encoder/decoder.

For MINA 3.0, we have to implement an Java independent serialization mechanism.

> Problems with ObjectSerializationCodecFactory using MINA in between Java 6 and Java 7
> -------------------------------------------------------------------------------------
>
>                 Key: DIRMINA-930
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-930
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.7
>         Environment: Windows 7, Java 7, Java 6
>            Reporter: Marco Waimer
>            Priority: Critical
>             Fix For: 3.0.0-trunk
>
>         Attachments: MinaClient.java, MinaServer.java, Server6Client7.txt, Server7Client6.txt
>
>
> We use mina with the org.apache.mina.filter.codec.serialization.ObjectSerializationCodecFactory for our communication framework. Using Java 7 on one side (i.e. server) and Java 6 on the other side (i.e. client) leads to problems with the deserialisation, in our case with a java.util.Locale object, which has additional fields in Java 7. See attached stack traces.
> We tracked the problem to org.apache.mina.core.buffer.AbstractIoBuffer.putObject(Object) and org.apache.mina.core.buffer.AbstractIoBuffer.getObject(ClassLoader), since this part is overriding java serialisation and omitting some class information, which will be needed for the deserialisation. 
> Using the attached example the stack traces could easily be reproduced, running one part with Java 7 and the other with Java 6. The MinaServer will simply open a port and the MinaClient will send a java.util.Locale object to that port.
> In MINA 1.1.7 ObjectOutputStream and ObjectInputStream were used without overriding writeClassDescriptor/readClassDescriptor, therefore the problem does not exist there.



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