Question

This question might have asked here number of times . After doing some google search for the above error and doing some update, I can’t understand why I’m still getting that error. I’ve already put my driver– mysql-connector-java-5.1.5-bin in the classpath:

Java_Home\jre\lib\
Java_Home\jre\lib\ext\
Java_Home\lib

and the code which I’m using to connect to mysql database is:

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

Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mail","root","");

Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select message_body from deadletter");
String dbtime;
while (rs.next()) {
dbtime = rs.getString(1);
System.out.println(dbtime);
} 

con.close();

}
catch (SQLException e) {
        System.out.println("Connection Failed! Check output console");
        e.printStackTrace();
        }

    }

and the complete stacktrace of the above exception is:

java.lang.ClassNotFoundException: com.mysql.jdbc:Driver
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.Class.forName0(Native Method)  
    at java.lang.Class.forName(Class.java:169)
    at mail.main(mail.java:114)  

Now, what’s wrong I’m doing here?

Answer 1

The most common cause is that you have some conflict in where your classes are loaded from. For example if you have 2 locations and one has JDBC drivers and the other one not then if your classloader loads from the 1st location and some class from the 1st location wants to use the driver – the driver is not there. So look for the duplicate JARs that are using your driver