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https://issues.apache.org/jira/browse/DERBY-6923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884309#comment-15884309
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Bryan Pendleton commented on DERBY-6923:
----------------------------------------

Assuming that this is in fact a strange behavior of Derby's locator  
implementation in the NetworkClient, DERBY-2496 is probably the relevant code 
to study.

> Passing a ClientClob or ClientBlob from another connection to an INSERT 
> statement results in 'null' being written.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-6923
>                 URL: https://issues.apache.org/jira/browse/DERBY-6923
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client, Network Server
>    Affects Versions: 10.13.1.1
>         Environment: Java 8
> MacOS
> Windows
>            Reporter: Gordon Innes
>            Priority: Critical
>         Attachments: DerbyEmbeddedOnly.java, DerbyNetworkOnly.java, 
> DerbyNetworkRead.java, DerbyNetworkWrite.java
>
>
> When assigning a Blob or Clob from a ResultSet to a PreparedStatement 
> parameter on a second connection, null is written to the column instead.
> Attached the same example using Embedded->Embedded, Embedded->Network, 
> Network->Embedded and Network->Network.
> Only the Network->Network example exhibits the fault.
> Originally discovered in HA-JDBC's sync code with 2 derby instances on 
> Windows. Example were tested using MacOS. Both were running on Oracle Java 8 
> VMs.



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