Spring 2.6.3: Failed to configure a DataSource: 'url' attribute

I have created a new Spring Starter Project and I specified in application.properties the db settings:

spring.jpa.hibernate.ddl-auto=update
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.datasource.url=jdbc:mysql://localhost:3306/mydb?&useLegacyDatetimeCode=false&serverTimezone=UTC&useUnicode=yes&character_set_server=utf8mb4
spring.datasource.username=.....
spring.datasource.password=.....

in pom.xml I have the mysql dependency:

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
</dependency>

I have also done maven -> Update....

When starting the project the console says:

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

I don´t understand..i just provided what he needs...the datasource.url...

When I change the spring version to 2.3.0.RELEASE...it works. But why not with the newer one 2.6.3?

As far as I know, Spring .properties file uses kebab-case for its key values.

You have

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

when it should be

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver