Spring Boot-ban külső adatbázis (PostgreSql) elérése?

Ezt a hibát kapom.

H2-t el tudom érni de külső adatbázist nem.

Properties fájlban be vannak jól állítva a dolgok.

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.

2018-02-11 16:40:29.983 ERROR 4136 --- [ main] o.s.boot.SpringApplication : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.postgresql.Driver