运行java项目时出错

Question

I've used this compiler till now and I've never had any problems with it, but now, when I run the following code (in Eclipse LUNA, latest version):

import java.sql.*;

public class TestJDBC {
    public static void main (String[] args) {
        String dbUrl = "jdbc:mysql://localhost:3306/database";
        String user = "user";
        String password = "root";
        try {
            Class.forName("org.gjt.mm.mysql.Driver");
        }
        catch(ClassNotFoundException e) {
            e.printStackTrace();
            System.out.println("Eroare incarcare driver!\n" + e);
        }
        try {
            Connection c=DriverManager.getConnection(dbUrl, user, password);
            Statement s= c.createStatement();
            ResultSet r = s.executeQuery(" SELECT cod, nume FROM localitati"
                                         + " ORDER BY nume");

            while (r.next()) {
                System.out.println(r.getString ("cod") + "," + r.getString ("nume") );
            }
            s.close();
        }
        catch(SQLException e) {
            e.printStackTrace();
        }
    }
}

I get the following errors:

java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at java.lang.Class.forName0(Native Method)
  at java.lang.Class.forName(Unknown Source)
  at TestJDBC.main(TestJDBC.java:8)
   Eroare incarcare driver!
  java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
  java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/database
  at java.sql.DriverManager.getConnection(Unknown Source)
  at java.sql.DriverManager.getConnection(Unknown Source)
  at TestJDBC.main(TestJDBC.java:15)

What can I do to solve this problem?

Answer 1

Your build is missing a JAR library in the build path. You can get it here:

1. Download the Latest MySQL Java Connector / Drive r
2. Unzip the zip file (in my case it was mysql-connector-java-5.1.31.zip)
3. copy the .jar file (mysql-connector-java-5.1.31-bin.jar) and paste it in your Lib folder:

Than do not forget to add the jar library to your build path.

Answer 2

java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver Exception came because of you don't have that class in your application.

To resolve issue you have to check is that class present in your lib file given or download and configure mysql-2_0_12.jar jar file it will support org.gjt.mm.mysql.Driver driver.

Answer 3

Download mysql driver jar click here

Add the jar in build path