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Thread: driver installed but still same error regarding connecting to mysql

  1. #1
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    Default driver installed but still same error regarding connecting to mysql

    hello,

    package g;

    import java.sql.*;
    /**
    *
    * @author ankit
    */
    public class m extends javax.swing.JFrame {

    /**
    * Creates new form m
    */
    public m() {
    initComponents();
    }

    /**
    * This method is called from within the constructor to initialize the form.
    * WARNING: Do NOT modify this code. The content of this method is always
    * regenerated by the Form Editor.
    */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

    db = new javax.swing.JComboBox();

    setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

    db.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
    db.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    dbActionPerformed(evt);
    }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addGap(138, 138, 138)
    .addComponent(db, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addContainerGap(180, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addGap(72, 72, 72)
    .addComponent(db, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addContainerGap(201, Short.MAX_VALUE))
    );

    pack();
    }// </editor-fold>

    private void dbActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    }

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
    * For details see How to Set the Look and Feel (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)
    */
    try {
    for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
    if ("Nimbus".equals(info.getName())) {
    javax.swing.UIManager.setLookAndFeel(info.getClass Name());
    break;
    }
    }
    } catch (ClassNotFoundException ex) {
    java.util.logging.Logger.getLogger(m.class.getName ()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
    java.util.logging.Logger.getLogger(m.class.getName ()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
    java.util.logging.Logger.getLogger(m.class.getName ()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
    java.util.logging.Logger.getLogger(m.class.getName ()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */

    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new m().setVisible(true);
    }
    });
    }

    // Variables declaration - do not modify
    private javax.swing.JComboBox db;
    // End of variables declaration

    String username="root",password="cutiepie_100",host="loca lhost";

    Class.forName("com.mysql.jdbc.Driver");

    }

    and the error is

    run:
    Exception in thread "main" java.lang.ClassFormatError: Method "<error>" in class g/m has illegal signature "(Ljava/lang/ObjectLjava/lang/Class$forName;"
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java :760)
    at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader .java:455)
    at java.net.URLClassLoader.access$100(URLClassLoader. java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 367)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.j ava:360)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:4 24)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308) at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:3 57)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:495)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)

    i haveset classpath jconnector but still this result


  2. #2
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    Default Re: driver installed but still same error regarding connecting to mysql

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly using code or highlight tags per the above link.

    Give your classes meaningful, useful names that start with capital letters. We generally do not help with GUI code generated by drag-and-drop code generators.

  3. #3
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    Default Re: driver installed but still same error regarding connecting to mysql

    Quote Originally Posted by GregBrannon View Post
    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly using code or highlight tags per the above link.

    Give your classes meaningful, useful names that start with capital letters. We generally do not help with GUI code generated by drag-and-drop code generators.
    Class.forName("com.mysql.jdbc.Driver");
    this line shows class not found

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