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From "Haolan Qin (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3033) select query results in nullpointer exception in skipScan()
Date Wed, 29 Aug 2007 20:36:30 GMT
select query results in nullpointer exception in skipScan()
-----------------------------------------------------------

                 Key: DERBY-3033
                 URL: https://issues.apache.org/jira/browse/DERBY-3033
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.2.2.0
         Environment: Windows XP, Java 5.0, JDBC, Derby 10.2.2.0
            Reporter: Haolan Qin


The following error was repeatedly thrown when we tried to run a select query via JDBC. Strangely,
the exact same select query did not trigger any error when run from the command line console.
After we added an index, the error went away completely. 

java.lang.NullPointerException
 at org.apache.derby.impl.sql.execute.NoPutResultSetImpl.skipScan(Unknown Source)
 at org.apache.derby.impl.sql.execute.TableScanResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.IndexRowToBaseRowResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.JoinResultSet.openRight(Unknown Source)
 at org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown Source)
 at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown Source)
 at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
 at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
 at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown Source)
 at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(Unknown Source)
 at org.apache.derby.impl.drda.DRDAStatement.execute(Unknown Source)
 at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown Source)
 at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)

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