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https://issues.apache.org/jira/browse/DERBY-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Ward closed DERBY-4333.
-----------------------------
verified fixed in 10.5.2.0
> 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
> Fix For: 10.5.2.0, 10.6.0.0
>
> 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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