java.sql.SQLException:invalid cursor state: identified cursor is not open identified cursor is not open

I am using Apache DBCP to get a pool of connections, I use PoolingDataSource to get a connection each time. It works well when I insert an object into the database, but problem occurs when I try to select an element from database: it always returns a DelegatingPreparedStatement and DelegatingResultSet, and if the next() method of DelegatingResuletSet executes, an error "java.sql.SQLException:invalid cursor state: identified cursor is not open identified cursor is not open" occurs. I don't know why, is there anybody know what the problem is? I am using HSQLDB开发者_如何学运维. The codes are:

String strSql = "select * from " + strTableName + " where " + strColumnName
    + " = ? ";

PreparedStatement aPreparedStatement = con.prepareStatement(strSql);

ResultSet aResultSet = null;

/*
 *  Execute the query
 */
try 
{
  aPreparedStatement.setString(1, strValue);

  aResultSet = aPreparedStatement.executeQuery();
}
catch (SQLException theException) 
{
  aPreparedStatement.close();

  throw theException;
}
aPreparedStatement.close();

while (theResultSet.next())
{
   // do something else
}

Thanks for your help, Ike

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You are closing the PreparedStatement before you are trying to iterate through the ResultSet. I don't think this is right - I think you should close them both at the same time, once you've retrieved all your results from the ResultSet object.

Edit: See the API for close():

"Note:When a Statement object is closed, its current ResultSet object, if one exists, is also closed."

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Closing the Any Statement(Statement/PreparedStatement/CallableStatement) will generally closes the associated ResultSet Object. So try to close the ResultSet first and then the PreparedStatement object.