Class.forName(“org.postgresql.Driver”) error

Question

I have simple class. Then I try to compile and run it I see ClassNotFoundException.

import java.sql.*;

public class DBProcessor{

private static String serverAd         


        

Answer 1

On the command line, this

java DBProcessor

should be

java -cp .;postgresql.jar DBProcessor

And, because it includes java.sql.Driver, when you have it working you could remove

// try {
//    Class.forName("org.postgresql.Driver");
// } catch (ClassNotFoundException e) {
//    System.err.println("Where is your PostgreSQL JDBC Driver? "
//            + "Include in your library path!");
//    e.printStackTrace();
// }

Per the DriverManager Javadoc,

The DriverManager methods getConnection and getDrivers have been enhanced to support the Java Standard Edition Service Provider mechanism. JDBC 4.0 Drivers must include the file META-INF/services/java.sql.Driver. This file contains the name of the JDBC drivers implementation of java.sql.Driver. For example, to load the my.sql.Driver class, the META-INF/services/java.sql.Driver file would contain the entry:

 my.sql.Driver

Applications no longer need to explictly load JDBC drivers using Class.forName(). Existing programs which currently load JDBC drivers using Class.forName() will continue to work without modification.