PostgreSQL JDBC Driver not working for Heroku DB C

问题:

I have a class that tries to connect to a Heroku database:

public class ConnectionFactory {

    public Connection getConnection() {
        System.out.println("Conectando ao banco");
        try {           
            return DriverManager.getConnection("connectionstring", "username", "password");
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}

What it returns is:

java.lang.RuntimeException: java.sql.SQLException: No suitable driver found for jdbc:postgres://osnvehqhufnxzr:[e-mail]:5432/d39mfq0odt56bv

I already tried postgresql-9.3-1103.jdbc3.jar and postgresql-9.4.1209.jre6.jar in the Build Path of the project. What I am doing wrong?

回答1:

Use postgresql in your JDBC URL and not postgres.

Also, you need to change your DB password (because you posted it publicly) by running this command:

$ heroku pg:credentials DATABASE --reset

回答2:

You need to load the driver class first by the class loader:

Class.forName("org.postgresql.Driver");
Connection conn = DriverManager.getConnection(...);

---

Also see: What is the purpose of 'Class.forName("MY_JDBC_DRIVER")'?

回答3:

The solution was simple, System.getenv("JDBC_DATABASE_URL") returns it in server and it does the correct configuration of login and password.

public Connection getConnection() throws URISyntaxException, SQLException 
{   
String urlDB = System.getenv("JDBC_DATABASE_URL");          
return DriverManager.getConnection(urlDB);  
}