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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