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From "A B (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-318) SYS.SYSCOLUMN problem with "GENERATED BY DEFAULT" column w/ Network Server
Date Thu, 26 May 2005 17:51:52 GMT
SYS.SYSCOLUMN problem with "GENERATED BY DEFAULT" column w/ Network Server
--------------------------------------------------------------------------

         Key: DERBY-318
         URL: http://issues.apache.org/jira/browse/DERBY-318
     Project: Derby
        Type: Bug
  Components: Network Server  
    Versions: 10.1.0.0    
 Environment: Derby in Network Server mode with either JCC or Derby Net Client.
    Reporter: A B


When connected to the Derby Network Server, if one has a table with a column defined as "GENERATED
BY DEFAULT" and then one tries to select the "COLUMNDEFAULT" field from SYS.SYSCOLUMNS, the
result is an NPE in the server code that leads to connection deallocation.

I don't know if this is a problem with the "GENERATED BY DEFAULT" feature or if it's a problem
with Network Server--more investigation is required.

To reproduce, use ij to connect to a database using Network Server, and then:

ij> create table t1 (i int generated by default as identity);
0 rows inserted/updated/deleted
ij> select columndefault from sys.syscolumns;

COLUMNDEFAULT

----------------------------------------------------------------------------------------------------
----------------------------
null
java.lang.NullPointerException
        at org.apache.derby.impl.drda.DRDAConnThread.writeFdocaVal(DRDAConnThread.java:6550)
        at org.apache.derby.impl.drda.DRDAConnThread.writeFDODTA(DRDAConnThread.java:5973)
        at org.apache.derby.impl.drda.DRDAConnThread.writeQRYDTA(DRDAConnThread.java:5796)
        at org.apache.derby.impl.drda.DRDAConnThread.processCommands(DRDAConnThread.java:595)
        at org.apache.derby.impl.drda.DRDAConnThread.run(DRDAConnThread.java:226)
agentThread[DRDAConnThread_2,5,main]
ERROR 58009: Execution failed due to a distribution protocol error that caused deallocation
of the conversation.  A DRDA Data Stream Syntax Error was detected.  Reason: 0x3


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