[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.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 10.4.2.1, 10.5.1.1, 10.6.1.0
• Component/s: SQL

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)
------------------------------------------------------

• Bug behavior facts: Crash, Regression
• Assignee: Unassigned
• Reporter: Le Guernic
• Created: 25/May/09 18:25
• Updated: 21/Jan/11 17:52
• Resolved: 10/Jun/09 21:49

Description

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

Issue Links

• duplicates: DERBY-4071 AssertFailure when selecting rows from a table with CHARACTER and VARCHAR columns
• relates to: DERBY-4071 AssertFailure when selecting rows from a table with CHARACTER and VARCHAR columns