Spring Boot - Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

Question

I am running a spring boot application that should connect to a database using hibernate, however I am getting the following exception: Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

My application.properties

server.port=9000
spring.datasource.url=jdbc:mysql://localhost/Users
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root

Here is my pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.1.9.RELEASE</version>
</parent>
<properties>
    <spring.boot.version>1.1.8.RELEASE</spring.boot.version>
    <start.class>com.server.boot.Starter</start.class>
    <spring.core.version>4.0.6.RELEASE</spring.core.version>
    <log4j.version>1.2.17</log4j.version>
    <tomcat.version>8.0.8</tomcat.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.core.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
    </dependency>
</dependencies>

My configuration class:

@Configuration
@ComponentScan({"com.server"})
@EnableAutoConfiguration
public class Starter {
    public static void main(String[] args){
        SpringApplication.run(Starter.class,args);
        System.out.println("started application");
    }   
    @Bean
    public LoginController loginController(){
        return new LoginController();
    }   
}

And my controller:

@Service
@Transactional
@RestController
@RequestMapping("/user")
public class LoginController {
    
    @PersistenceContext
    private EntityManager entityManager;
    
    @RequestMapping(value="/login",method=RequestMethod.POST)
    public String login(@RequestParam(value="username",required=true) String username, 
                        @RequestParam(value="password",required=true) String password){
        return "Tried to login as "+username + " where em is "+entityManager;
    }
}

What is the cause of this?

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Upon further research

I believe the answer to this question org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set solved it