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Thread: JDBC code not included into JAR file??

  1. #1
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    Question JDBC code not included into JAR file??

    Hi there, was wondering if anyone could help me.

    I developed an application which works with MySQL using JDBC. It all works fine, but when I try to create a JAR file for my program, the code that uses mySQL seems not to be included into the jar file!

    I added code for displaying messages in different parts of my code to find out at what point the problem is. It looks like the code that goes after line "Statement statement = connection.createStatement();" does not get included into the jar file.

    Here is my main class code:
    import java.sql.*;
    import javax.swing.JFrame;
    import javax.swing.JOptionPane;
     
    public class ResourceManagementApplication extends JFrame {
    	private static MainFrame mainFrame;
     
    	public static void main(String[] args) {		
               Database db = new Database();		
     
              try {
            	JOptionPane.showMessageDialog(null, "here 1",
    	    			"There was an error!", JOptionPane.ERROR_MESSAGE);	    	
     
            	Connection connection = db.connect("jdbc:mysql://localhost:3306/", "root", "pw");
     
            	JOptionPane.showMessageDialog(null, "here 2",
    	    			"There was an error!", JOptionPane.ERROR_MESSAGE);
     
            	Statement statement = connection.createStatement();
     
    		JOptionPane.showMessageDialog(null, "here 3",
    	    			"There was an error!", JOptionPane.ERROR_MESSAGE);
     
                   statement.executeUpdate("USE ResourceManagementApplication;");
     		JOptionPane.showMessageDialog(null, "here 4",
    	    			"There was an error!", JOptionPane.ERROR_MESSAGE);
     
                   statement.close();
          		mainFrame = new MainFrame(connection);      
            }
            catch( SQLException e ) {
    	    	e.printStackTrace();
    	}
    	catch( Exception e ) {
    	    	e.printStackTrace();
    	}
        }
    }
    If I create and run the jar file, I get error message saying "here 1" and "here 2", but nothing at all happens after that.

    Any ideas why that could be? I really need to get this working!
    Last edited by copeg; December 17th, 2010 at 11:01 AM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: JDBC code not included into JAR file??

    For future reference, please flank you code with the [highlight=java][/highlight] tags. I've edited your post to highlight the java code.

    Any exceptions being thrown? What does the console look like during runtime? My guess is that you are missing the driver on your classpath, which would cause an exception to be thrown and the behavior you see. Package the drive in your jar, or include it on the classpath when you run the jar.

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    friday (December 17th, 2010)

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    Default Re: JDBC code not included into JAR file??

    oh, sorry, will do next time.

    no, no exceptions as far as I could see.

    that sounds like a very good guess! The problem is - I have no idea how to do it. Could you help or tell me what to google?

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    Default Re: JDBC code not included into JAR file??

    Quote Originally Posted by friday View Post
    The problem is - I have no idea how to do it. Could you help or tell me what to google?
    Lesson: Packaging Programs in JAR Files (The Java™ Tutorials > Deployment)

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    friday (December 17th, 2010)

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    Default Re: JDBC code not included into JAR file??

    thanks everyone, it works now!

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