JDBC/ODBC Local Access

I have wrote a JApplet code that using JDBC/ODBC bridge to connecting a local Database (MS Access).
I have used signed applet but it doesn't work and returns the following error message:
java.lang.SecurityException: class "Project1$5"'s signer information does not match signer information of other classes in the same package
at java.lang.ClassLoader.checkCerts(ClassLoader.java:522)
at java.lang.ClassLoader.defineClass(ClassLoader.java:485)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:142)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:108)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
at Project1.showFieldCombo(Project1.java:328)
at Project1.ComboBoxShow(Project1.java:472)
at Project1.init(Project1.java:489)
at sun.applet.AppletPanel.run(AppletPanel.java:344)
at java.lang.Thread.run(Thread.java:484)
Process Exit...
(I have five class file and I have used them in a signed jar file)
when I change the code and run it as an JFrame Application it works correctly.(without signing and jar file)
What can I do to solving this problem?
Thanks a lot,
Payam

I found the answer by myself:
the application was finding a copy of .class in my classpath before it finds the one in the jar file.

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import java.awt.event.*;
import java.sql.*; //SQL package for the statements
import javax.swing.*;
class DatabaseMan
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import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import DatabaseMan;
import javax.swing.*;
class DBviewer extends JDialog implements ActionListener
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     private JButton m_buttonNext;
     private JButton m_buttonPrevious;
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     private JButton m_buttonClose;
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     private JTextField m_age;
     private JTextField m_weight;
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     private JTextField m_acceleration;
     private JTextField m_jump;
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     private JTextField m_bravery;
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     private JLabel m_labeljump;
     private JLabel m_labelstamina;
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     private JLabel m_labelfitness;
     private JLabel m_labelexperience;
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          m_weight.setBackground(Color.black);
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          m_speed.setBackground(Color.black);
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          m_acceleration.setEditable(false);
          m_acceleration.setBackground(Color.black);
          m_acceleration.setForeground(Color.white);
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          m_professionalism.setEditable(false);
          m_professionalism.setBackground(Color.black);
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          m_jump.setBackground(Color.black);
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          m_stamina.setEditable(false);
          m_stamina.setBackground(Color.black);
          m_stamina.setForeground(Color.white);
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          m_bravery.setEditable(false);
          m_bravery.setBackground(Color.black);
          m_bravery.setForeground(Color.white);
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          m_fitness.setEditable(false);
          m_fitness.setBackground(Color.black);
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          m_experience.setBackground(Color.black);
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          data.add(m_stamina);
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          data.add(m_bravery);
          data.add(m_labelfitness);
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                    if( m_DatabaseMan.m_resultSet.first() )
                         transferData(type1);
               catch (SQLException exSQL )
                    System.err.println( exSQL.toString() );
          //button next record is pressed
          if( evt.getSource() == m_buttonNext )
               try
                    if(!m_DatabaseMan.m_resultSet.isLast())
                         if(m_DatabaseMan.m_resultSet.next())
                              transferData(type1);
               catch (SQLException exSQL )
                    System.err.println( exSQL.toString() );
          //previous button is pressed
          if( evt.getSource() == m_buttonPrevious )
               try
                    if( !m_DatabaseMan.m_resultSet.first())
                         if(m_DatabaseMan.m_resultSet.previous())
                              transferData(type1);
               catch (SQLException exSQL )
                    System.err.println( exSQL.toString() );
          //last button is pressed
          if( evt.getSource() == m_buttonLast )
               try
                    if(m_DatabaseMan.m_resultSet.last())
                         transferData(type1);
               catch (SQLException exSQL )
                    System.err.println( exSQL.toString() );
          // close button(s) pressed
          if( evt.getSource() == m_buttonClose)
               setVisible( false );
               dispose(); //return the dialog window resources
               m_DatabaseMan.CloseConnection();
          if( evt.getSource() == m_mainbuttonClose)
               setVisible( false );
               dispose(); //return the dialog window resources
               m_DatabaseMan.CloseConnection();
     public void transferData(String type1) throws SQLException //return a String
          if(type1 =="Horse")
               //transfer horse details
               m_name.setText(m_DatabaseMan.m_resultSet.getString("NAME"));
               m_professionalism.setText(m_DatabaseMan.m_resultSet.getString("PROFESSIONALISM"));
               m_speed.setText(m_DatabaseMan.m_resultSet.getString("SPEED"));
               m_stamina.setText(m_DatabaseMan.m_resultSet.getString("STAMINA"));
               m_weight.setText(m_DatabaseMan.m_resultSet.getString("WEIGHT"));
               m_experience.setText(m_DatabaseMan.m_resultSet.getString("EXPERIENCE"));
               m_fitness.setText(m_DatabaseMan.m_resultSet.getString("FITNESS"));
               m_jump.setText(m_DatabaseMan.m_resultSet.getString("JUMP"));
               m_age.setText(m_DatabaseMan.m_resultSet.getString("AGE"));
               m_bravery.setText(m_DatabaseMan.m_resultSet.getString("BRAVERY"));
               m_acceleration.setText(m_DatabaseMan.m_resultSet.getString("ACCELERATION"));
          if(type1 =="Jockey")
               m_name.setText(m_DatabaseMan.m_resultSet.getString("NAME"));
               m_age.setText(m_DatabaseMan.m_resultSet.getString("AGE"));
          if(type1 =="Course")
               //transfer course details not implemented yet
} //end of class DBviewer
I ve set up an odbc driver and the database has data in it but I still get this run time error an no data is transfered to the dialog box
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1525)
at sun.jdbc.odbc.JdbcOdbcResultSet.reWordAsCountQuery(JdbcOdbcResultSet.java:6268)
at sun.jdbc.odbc.JdbcOdbcResultSet.calculateRowCount(JdbcOdbcResultSet.java:6061)
at sun.jdbc.odbc.JdbcOdbcResultSet.initialize(JdbcOdbcResultSet.java:150)
at sun.jdbc.odbc.JdbcOdbcStatement.getResultSet(JdbcOdbcStatement.java:420)
at sun.jdbc.odbc.JdbcOdbcStatement.executeQuery(JdbcOdbcStatement.java:250)
at DatabaseMan.<init>(DatabaseMan.java:34)
at DBviewer.<init>(DBviewer.java:83)
at MainWindow.actionPerformed(MainWindow.java:266)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)
at java.awt.Component.processMouseEvent(Component.java:3715)
at java.awt.Component.processEvent(Component.java:3544)
at java.awt.Container.processEvent(Container.java:1164)
at java.awt.Component.dispatchEventImpl(Component.java:2593)
at java.awt.Container.dispatchEventImpl(Container.java:1213)
at java.awt.Component.dispatchEvent(Component.java:2497)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)
at java.awt.Container.dispatchEventImpl(Container.java:1200)
at java.awt.Window.dispatchEventImpl(Window.java:914)
at java.awt.Component.dispatchEvent(Component.java:2497)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
Im really stuck!!! any suggestions? thanks in advance

Thank you for your response and sorry for the length
of code,
Thats was my first idea that it was asking for
or something I dont have but I checked my database and
I dont have any unusually large data entries (most
between 8-15 letters, the others are numbers) could it
be something wrong with how I've entered the database
in MsAccess, or am i barking up the wrong tree again!
Many thanks
RobI think you've misunderstood me. This has nothing to do with unusually large data entries, but rather the opposite. You are wrongly expecting data that is shorter than you think. When you call rs.getString(i) to retrieve a column value of a field, and you only want the first 5 characters in the column (instead of 10 or whatever the column size is), you would do something similar to the following:
String column_value = rs.getString(1).subtstring(0,5);The above expects a String that is at least 5 characters. Your problem is when your column value returned is less than the specified substring index ( in this case 5 ) it will throw an exception. If you changed your code to this, the error will not occur:
String column_value = rs.getString( 1 ).subtstring( 0, 5);
if ( column_value.length() > 5 )
column_value = column_value.substring( 0, 5 );
}Jamie

JDBC/ODBC Local Access

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