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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DERBY-4333) Exception in getMaxRows() after NullPointerException in SQLClob.readExternal() during query in table with CLOB column
Date Mon, 03 Aug 2009 19:45:15 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan reassigned DERBY-4333:
--------------------------------------

    Assignee: Kristian Waagan

I'll start looking at this issue, since it seems like another problem with the new Clob code.

> Exception in getMaxRows() after NullPointerException in  SQLClob.readExternal() during
query in table with CLOB column
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4333
>                 URL: https://issues.apache.org/jira/browse/DERBY-4333
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.1.1
>            Reporter: Jason Ward
>            Assignee: Kristian Waagan
>         Attachments: derby.log, derby_10.5_debug.zip
>
>
> Observed derby 10.5.1.1 throwing exception in getMaxRows() when querying table with greater
than ~20K rows and CLOB column.
> The exception is : 
> java.sql.SQLException: No current connection.
> 	at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
> 	at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
> 	at org.apache.derby.client.am.Statement.getMaxRows(Unknown Source)
> 	at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.getMaxRows(NewProxyPreparedStatement.java:1200)
> 	at org.hibernate.jdbc.AbstractBatcher.closeQueryStatement(AbstractBatcher.java:298)
> 	at org.hibernate.jdbc.AbstractBatcher.closeQueryStatement(AbstractBatcher.java:234)
> 	at org.hibernate.loader.Loader.getResultSet(Loader.java:1826)
> 	at org.hibernate.loader.Loader.doQuery(Loader.java:697)
> 	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
> 	at org.hibernate.loader.Loader.doList(Loader.java:2232)
> 	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129)
> 	at org.hibernate.loader.Loader.list(Loader.java:2124)
> 	at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:118)
> 	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1597)
> 	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
> 	at com.jw.TestMain.query(TestMain.java:175)
> 	at com.jw.TestMain.main(TestMain.java:189)
> Caused by: org.apache.derby.client.am.SqlException: No current connection.
> 	at org.apache.derby.client.am.Statement.checkForClosedStatement(Unknown Source)
>  
> In digging into the stacktrace a little more it seems that hibernates call to getMaxRows()
blows up because checkForClosedStatement() throws the SQLException, but I have no idea why.
(I've verified the connection is open prior to executing hibenates list(), and it happens
too quickly to be a true timeout.) 
>  
> It only happens once my table reaches any significant size ( > 20K rows), and only
on this particular table which includes a CLOB column. 
> Curiously 10.4.2.1 does not exhibit this behavior. 
> I have prepared a small eclipse project which repros the error and will attach.

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