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https://issues.apache.org/jira/browse/DERBY-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909171#action_12909171
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Tiago R. Espinha commented on DERBY-4799:
-----------------------------------------

I think this is just the behavior on the server. If you look at 
NetConnectionRequest.buildRDBNAM(String, boolean) you'll find this call:

(line 488)
netAgent_.getCurrentCcsidManager().convertFromJavaString(rdbnam, netAgent_);

Now, if we consider that up until now the only CCSID manager was of the type 
EbcdicCcsidManager, then the client has always been encoding the RDBNAM in 
EBCDIC. It is only the server, when it has to send the RDBNAM back to the 
client (it happens in certain occasions), that will send it in UTF-8 as seen on 
the method you've changed.

I'm not sure this follows the specification and with my changes, rather than 
getting the length like this, I was pulling it from the CCSID manager's 
getByteLength() method. I reckon the override for this method requires some 
adjusting in the EBCDIC case, but I think this would be more correct from a 
DRDA perspective.

> IllegalArgumentException when generating error message on server
> ----------------------------------------------------------------
>
>                 Key: DERBY-4799
>                 URL: https://issues.apache.org/jira/browse/DERBY-4799
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.6.1.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>         Attachments: fix.diff, test.diff
>
>
> If you for example try to connect to a non-existing database using the client 
> driver, and the name of the database has 18 characters or more, and at least 
> one of the characters in the database name is a non-ascii character, the 
> server will throw an IllegalArgumentException when trying to send the 
> "database not found" message back to the client.
> Example:
> ij> connect 'jdbc:derby://localhost/abcdefghijklmnopqå';
> ERROR 08006: A network protocol error was encountered and the connection has 
> been terminated: A PROTOCOL Data Stream Syntax Error was detected.  Reason: 
> 0x12. Plaintext connection attempt to an SSL enabled server?
> Printed to the console by the server:
> Tue Sep 14 09:12:05 CEST 2010 : fromIndex(60) > toIndex(59)
> java.lang.IllegalArgumentException: fromIndex(60) > toIndex(59)
>       at java.util.Arrays.rangeCheck(Arrays.java:1306)
>       at java.util.Arrays.fill(Arrays.java:2567)
>       at org.apache.derby.impl.drda.DDMWriter.padBytes(DDMWriter.java:1254)
>       at 
> org.apache.derby.impl.drda.DDMWriter.writeScalarPaddedBytes(DDMWriter.java:992)
>       at 
> org.apache.derby.impl.drda.DRDAConnThread.writeRDBNAM(DRDAConnThread.java:583)
>       at 
> org.apache.derby.impl.drda.DRDAConnThread.writeRDBfailure(DRDAConnThread.java:1248)
>       at 
> org.apache.derby.impl.drda.DRDAConnThread.parseDRDAConnection(DRDAConnThread.java:1194)
>       at 
> org.apache.derby.impl.drda.DRDAConnThread.processCommands(DRDAConnThread.java:968)
>       at 
> org.apache.derby.impl.drda.DRDAConnThread.run(DRDAConnThread.java:294)

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