Question

This is the first time I got this error.
This code basically gets the sum of each item sold in a particular date.

Any tips on resolving this problem? Thanks.

       Statement statement = connection.createStatement();
       String query = "SELECT itemcode, SUM(quantity) AS 'Total Sales Per Day' "
               + "FROM sales "
               + "WHERE real_pur_date = '" + date + "' "
               + "GROUP BY itemcode ";
       ResultSet rs = statement.executeQuery( query ); // this line gets the error / exception
       while( rs.next() ){
           Vector row = new Vector();
           row.add( rs.getString( "itemcode" ) );
           row.add( rs.getInt( "Total Sales Per Day" ) );
           dailyData.add( row );
       }
       statement.close();

Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at com.mysql.jdbc.Util.handleNewInstance(Util.java:431)
at com.mysql.jdbc.ResultSetImpl.getInstance(ResultSetImpl.java:383)
at com.mysql.jdbc.MysqlIO.buildResultSetWithRows(MysqlIO.java:3140)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:491)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3118)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2288)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2709)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2627)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1556)
at posinventory.Controller.StatisticEngine.getDailyData(StatisticEngine.java:20)
at posinventory.Statistic.refreshTableDailyStat(Statistic.java:36)
at posinventory.Statistic.refreshTableDailyStat(Statistic.java:37)
at posinventory.Statistic.refreshTableDailyStat(Statistic.java:37)
at posinventory.Statistic.refreshTableDailyStat(Statistic.java:37)

Answer 1

You really should post the code from posinventory.Statistic.refreshTableDailyStat, but I’ll guess at it: in that method, line 36 calls StatisticEngine.getDailyData; line 37 calls refreshTableDailyStat recursively — so there’s your problem, Statistic.java, line 37.