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From Peter Ondruška <peter.ondru...@gmail.com>
Subject Re: Bug in Derby 10.5.1.1 or misuse ?
Date Mon, 25 May 2009 15:59:41 GMT
Would you please try if there is any difference if you remove "name IN (?)".

2009/5/25, Gurvan Le Guernic <gleguern@gmail.com>:
> The NullPointer exception is thrown by the statement:
> ps = dbConnection.prepareStatement(sqlStr);
> ,with ps a PreparedStatement ans sqlStr a string equal to
>
> SELECT method, COUNT(method) FROM methodParameters      INNER JOIN types
> ON parameter = id WHERE name IN (?) GROUP BY method HAVING COUNT(method)
>  >= ?
>
> I use similar code to prepare other statements and they work well. So I
> guess that if there is an error in my code, it lies in the SQL select query.
>
> Bryan Pendelton suggested filling a bug query. If I have no clue what
> happens this evening, I' ll do it.
>
> Peter Ondruška wrote:
>> Can we see how you set parameters for this prepared statement?
>>
>> 2009/5/25, Gurvan Le Guernic <gleguern@gmail.com>:
>>
>>>    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
>>>
>>>
>
>

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