Java + postegre connection problem in Heroku

Question

Trying to connect java to the Heroku database (postgre), I have checked the url several times and there are no errors. I am not using Hibernate. By pgadmin I can enter it into the database normally. How to fix this error? Should I make a change to pom.xml?

private static Connection getConnection() {
    try {
        String dbUrl = "jdbc:postgresql://ec2-54-83-27-147.compute-1.amazonaws.com:5432/d1o8bcicho5jj?user=usuario&password=senha&sslmode=require";
        return DriverManager.getConnection(dbUrl);
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}

Error:

java.sql.Sqlexception: No suitable driver found for jdbc:postgresql://ec2...

pom.xml:

<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.0-801.jdbc4</version>
</dependency>