spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.datasource.url=jdbc:mariadb://localhost:3306/mydb
spring.datasource.username=uasername
spring.datasource.password=password

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-jdbc</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
        <version>2.6.0</version><!--$NO-MVN-MAN-VER$-->
    </dependency>

spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.datasource.url=jdbc:mariadb://localhost:3306/mydb
spring.datasource.username=uasername
spring.datasource.password=password

spring.datasource2.driver-class-name=org.mariadb.jdbc.Driver
spring.datasource2.url=jdbc:mariadb://localhost:3306/mydb2
spring.datasource2.username=uasername
spring.datasource2.password=password

@Bean
@Primary
@Qualifier("datasource-default")
@ConfigurationProperties( "spring.datasource")
public DataSource dataSource() {
    return DataSourceBuilder.create().build();
}

@Bean
@Qualifier("datasource-2")
@ConfigurationProperties( "spring.datasource2")
public DataSource dataSource2() {
    return DataSourceBuilder.create().build();
}

java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName.
    at com.zaxxer.hikari.HikariConfig.validate(HikariConfig.java:850) ~[HikariCP-2.6.0.jar:na]

spring.datasource2.jdbcUrl=jdbc:mariadb://localhost:3306/mydb2