Hi,
I have a java.lang.NullPointerException when preparing the following
statement:
SELECT method, COUNT(method) FROM methodParameters INNER JOIN types
ON parameter = id WHERE name IN (?) GROUP BY method HAVING COUNT(method)
>= ?
with the command: dbConnection.prepareStatement(sqlStr);
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" +
")"
and
"CREATE TABLE methodParameters (" +
" method INT REFERENCES methods (id)," +
" position INT," +
" parameter INT REFERENCES types (id)" +
")"
SQL information for the exception are:
SQL state: XJ001
Error code: 0
And the stack trace is:
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:370)
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
I can't see what I am doing wrong, but I am not an SQL expert. So, I am
doing something wrong or is there a problem with Derby 10.5.1.1?
Thank you,
Gurvan
