Java – Spring how to set datasource in Spring Boot

I'm just learning Spring and I've been struggling for the past couple of days on how to configure the Spring JdbcTemplate to use my PostgreSQL database. I don't know how to do this. I keep reading the documentation, (such as http://docs.spring.io/spring/docs/current/spring-framework-reference/html/jdbc.html) but it seems like I'm going around in circles.

From the errors thrown it seems that it can't instantiate the RelationalDatabase Class that I wrote as a bean. I'm not sure what it would take to instantiate the class properly.

How do I move from something like the guides (Like https://spring.io/guides/gs/relational-data-access/) which totally work to a more complex solution?

Relational Database Class

@Repository
public class RelationalDatabase 
{

    private JdbcTemplate jdbcTemplate;

    public RelationalDatabase(){}


    public RelationalDatabase(JdbcTemplate jdbcTemplate)
    {
        this.jdbcTemplate = jdbcTemplate;
    }

    @Autowired
    public void setDataSource(javax.sql.DataSource dataSource) {
        this.jdbcTemplate = new JdbcTemplate(dataSource);
    }

    public JdbcTemplate getJdbcTemplate() {
        return jdbcTemplate;
    }


    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

}

\src\main\resources\application-dev.properties

spring.datasource.url=jdbc:postgresql://192.168.56.102:5432/scibase
spring.datasource.type=org.postgresql.ds.PGPoolingDataSource 
spring.datasource.username=lemon
spring.datasource.password=XXXXXX
spring.datasource.platform=postgres
spring.datasource.max-active=100
spring.datasource.name=lime
spring.database.driverClassName=org.postgresql.Drive

Stack Trace (Summary)

org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'relationalDatabase': Injection of autowired
dependencies failed; nested exception is
org.springframework.beans.factory.BeanCreationException: Could not
autowire method: public void
com.scientifi.papers.db.relational.RelationalDatabase.setDataSource(javax.sql.DataSource);

nested exception is
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'dataSource' defined in class path resource
[org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$NonEmbeddedConfiguration.class]:
Bean instantiation via factory method failed;

nested exception is
org.springframework.beans.BeanInstantiationException: Failed to
instantiate [javax.sql.DataSource]: Factory method 'dataSource' threw
exception; nested exception is
org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException:
Cannot determine embedded database driver class for database type
NONE. If you want an embedded database please put a supported one on
the classpath. If you have database settings to be loaded from a
particular profile you may need to active it (the profiles "dev "
are currently active).

Thanks!