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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4584) Unable to connect to network server if client thread name has Japanese characters
Date Mon, 29 Mar 2010 17:09:27 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851006#action_12851006
] 

Knut Anders Hatlen commented on DERBY-4584:
-------------------------------------------

Thanks, the fix looks fine to me, but I think we need to add comments to the code both in
NetConnection and in the test, as the purpose of this code is not obvious just by looking
at it. Also, I think the connection returned by BaseJDBCTestCase.openConnection(String) is
not closed automatically by the test harness, so it needs to be closed manually in the test
case. DRDAProtocolTest.tearDown() also needs to call super.tearDown().

> Unable to connect to network server if client thread name has Japanese characters
> ---------------------------------------------------------------------------------
>
>                 Key: DERBY-4584
>                 URL: https://issues.apache.org/jira/browse/DERBY-4584
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0
>            Reporter: Brett Wooldridge
>            Assignee: Tiago R. Espinha
>         Attachments: DERBY-4584-fix.diff, DERBY-4584-test.diff, DERBY-4584.diff
>
>
> I am opening this bug, which is probably a duplicate of bug#728 so that other's may find
it and save the hours I spent chasing it down.  Feel free to mark this as a duplicate.  However,
while related, it may not be a true duplicate of 728.
> The exception is similar to 728:
> Exception in thread "main" org.apache.derby.client.am.SqlException: Unicode string can't
convert to Ebcdic string
> (Here is the version of the exception I received -- excuse the Japanese characters):
> Caused by: org.apache.derby.client.am.SqlException: Unicode ストリングを EBCDIC
ストリングに変換することはできません。
> 	at org.apache.derby.client.net.EbcdicCcsidManager.convertFromUCS2(Unknown Source)
> 	at org.apache.derby.client.net.Request.writeScalarString(Unknown Source)
> 	at org.apache.derby.client.net.Request.writeScalarString(Unknown Source)
> 	at org.apache.derby.client.net.NetConnectionRequest.buildEXTNAM(Unknown Source)
> 	at org.apache.derby.client.net.NetConnectionRequest.buildEXCSAT(Unknown Source)
> 	at org.apache.derby.client.net.NetConnectionRequest.writeExchangeServerAttributes(Unknown
Source)
> 	at org.apache.derby.client.net.NetConnection.writeServerAttributesAndKeyExchange(Unknown
Source)
> 	at org.apache.derby.client.net.NetConnection.flowServerAttributesAndKeyExchange(Unknown
Source)
> 	at org.apache.derby.client.net.NetConnection.flowUSRIDPWDconnect(Unknown Source)
> 	at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
> 	at org.apache.derby.client.net.NetConnection.initialize(Unknown Source)
> 	at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
> 	at org.apache.derby.client.net.NetConnection40.<init>(Unknown Source)
> 	at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(Unknown
Source)
> 	at org.apache.derby.client.net.NetXAConnection.createNetConnection(Unknown Source)
> 	at org.apache.derby.client.net.NetXAConnection.<init>(Unknown Source)
> 	at org.apache.derby.client.ClientPooledConnection.getNetXAConnection(Unknown Source)
> 	... 45 more
> However, the difference is that the database name (and connection URL) does NOT contain
unicode characters.  In this case, the *thread name* contains Japanese characters.  If the
thread performing java.sql.DriverManager.getConnection() has characters that cannot be translated
into EBCDIC the above exception is the result.  If the thread name is changed to contain only
standard ASCII characters, the connection to the DB is successful.  Note again, in my case,
the connection URL is a standard connection URL with no i18n characters, something similar
to:
> jdbc:derby://localhost/database
> It is only the thread-name that contains i18n characters.  I don't know why the client
feels it necessary to marshall the client-thread name, but that seems to be the problem. 
The fix for this issue is likely easier than 728 if the requirement that the client marshall
the thread name can be removed (it seems senseless).
> Finally, just for the record, a typical thread name that tickles this bug is:
> "Running-2 (MOTDバナーの設定 for 10.0.0.90@Default)"
> If the Japanese is removed from the thread names, there is no problem.
> The workaround in our case was to change the thread names in our code to not contain
Japanese characters.

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