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From "Le Guernic (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4247) Null pointer exception generated when preparing a statement containing "IN (?)" or "= ?", but not if using "IN (?, ?)" or enclosing the select query in another query.
Date Mon, 25 May 2009 18:26:45 GMT
Null pointer exception generated when preparing a statement containing "IN (?)" or "= ?", but
not if using "IN (?, ?)" or enclosing the select query in another query.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: DERBY-4247
                 URL: https://issues.apache.org/jira/browse/DERBY-4247
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.5.1.1
         Environment: Nom du système d'exploitation :         Linux
Architecture du système d'exploitation :         i386
Version du système d'exploitation :         2.6.22.18-laptop-1mdv
java.specification.name: Java Platform API Specification
java.specification.version: 1.6
--------- Informations Derby --------
JRE - JDBC: Java SE 6 - JDBC 4.0
[/home/gleguern/office/atelier/jmbrowser/libs/derby.jar] 10.5.1.1 - (764942)
[/usr/local/db-derby-10.4.2.0-bin/lib/derbytools.jar] 10.4.2.0 - (689064)
[/usr/local/db-derby-10.4.2.0-bin/lib/derby.jar] 10.4.2.0 - (689064)
------------------------------------------------------
            Reporter: Le Guernic


Null pointer exception generated when preparing a statement containing "IN (?)", "GROUP BY",
and "HAVING".
The bug occurs if using "IN (?)" or "= ?", but not if using "IN (?, ?)" or enclosing the select
query in another query.

The tables involved are:

	"CREATE TABLE types (" +
	"  id INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY," +
	"  name VARCHAR(128) NOT NULL UNIQUE," +
	"  shortName VARCHAR(64) NOT NULL" +
	")";

	"CREATE TABLE methodParameters (" +
	"  method INT REFERENCES methods (id)," +
	"  position INT," +
	"  parameter INT REFERENCES types (id)" +
	")";

The null pointer exception is generated by the command:   dbConnection.prepareStatement(sqlStr);

when sqlStr is:
  SELECT method   FROM methodParameters AS mp        INNER JOIN types ON mp.parameter = types.id
  WHERE types.name IN (?)   GROUP BY method   HAVING COUNT(method) >= ?
or
  SELECT method   FROM methodParameters AS mp        INNER JOIN types ON mp.parameter = types.id
  WHERE types.name = ?   GROUP BY method   HAVING COUNT(method) >= ?

but not when sqlStr is:
  SELECT method   FROM methodParameters AS mp        INNER JOIN types ON mp.parameter = types.id
  WHERE types.name IN (?, ?)   GROUP BY method   HAVING COUNT(method) >= ?
or
SELECT method FROM methodParameters WHERE method IN (  SELECT method   FROM methodParameters
AS mp        INNER JOIN types ON mp.parameter = types.id   WHERE types.name IN (?)   GROUP
BY method   HAVING COUNT(method) >= ? )

The information about the exception are:

 SQL state: XJ001
 Error code: 0
 Message: Exception Java : ': java.lang.NullPointerException'.

java.sql.SQLException: Exception Java : ': java.lang.NullPointerException'.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
        at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown Source)
        at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
        at org.thinkcollabs.jmbrowser.db.DAO.initSelect(DAO.java:375)
        at org.thinkcollabs.jmbrowser.db.DB_Derby$MethodDataLoader.run(DB_Derby.java:254)
Caused by: java.sql.SQLException: Exception Java : ': java.lang.NullPointerException'.
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown
Source)
        ... 16 more
Caused by: java.lang.NullPointerException
        at org.apache.derby.impl.sql.compile.ColumnReference.remapColumnReferencesToExpressions(Unknown
Source)
        at org.apache.derby.impl.sql.compile.AggregateNode.getNewExpressionResultColumn(Unknown
Source)
        at org.apache.derby.impl.sql.compile.GroupByNode.addAggregateColumns(Unknown Source)
        at org.apache.derby.impl.sql.compile.GroupByNode.addNewColumnsForAggregation(Unknown
Source)
        at org.apache.derby.impl.sql.compile.GroupByNode.addAggregates(Unknown Source)
        at org.apache.derby.impl.sql.compile.GroupByNode.init(Unknown Source)
        at org.apache.derby.iapi.sql.compile.NodeFactory.getNode(Unknown Source)
        at org.apache.derby.impl.sql.compile.SelectNode.genProjectRestrict(Unknown Source)
        at org.apache.derby.impl.sql.compile.SelectNode.modifyAccessPaths(Unknown Source)
        at org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(Unknown Source)
        at org.apache.derby.impl.sql.compile.CursorNode.optimizeStatement(Unknown Source)
        at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
        at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
        at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown
Source)
        ... 9 more

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