title: Spring Boot not reading application.properties for DataSource
body: <p>I've put my DataSource details in /resources/application.properties file:</p>
  
  <pre><code>spring.datasource.url = jdbc:mysql://localhost:3306/dsm
  spring.datasource.username = root
  spring.datasource.password = admin123
  spring.datasource.testWhileIdle = true
  spring.datasource.validationQuery = SELECT 1
  
  spring.jpa.show-sql = true
  spring.jpa.hibernate.ddl-auto = update
  spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
  
  spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
  </code></pre>
  
  <p>I've tried adding a direct reference to the properties file, this this didn't make any difference.</p>
  
  <pre><code>@PropertySource("classpath:application.properties")
  </code></pre>
  
  <p>The error being generated is:</p>
  
  <pre><code>2015-11-23 14:44:30.232  INFO 54329 --- [on(2)-127.0.0.1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'requestContextFilter' to: [/*]
  2015-11-23 14:44:31.522  INFO 54329 --- [on(2)-127.0.0.1] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
  2015-11-23 14:44:31.535  INFO 54329 --- [on(2)-127.0.0.1] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
      name: default
      ...]
  2015-11-23 14:44:31.629  INFO 54329 --- [on(2)-127.0.0.1] org.hibernate.Version                    : HHH000412: Hibernate Core {4.3.11.Final}
  2015-11-23 14:44:31.632  INFO 54329 --- [on(2)-127.0.0.1] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
  2015-11-23 14:44:31.636  INFO 54329 --- [on(2)-127.0.0.1] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
  2015-11-23 14:44:31.824  INFO 54329 --- [on(2)-127.0.0.1] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
  23-Nov-2015 14:44:32.005 WARNING [RMI TCP Connection(2)-127.0.0.1] org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver Not loading a JDBC driver as driverClassName property is null.
  23-Nov-2015 14:44:32.008 SEVERE [RMI TCP Connection(2)-127.0.0.1] org.apache.tomcat.jdbc.pool.ConnectionPool.init Unable to create initial connections of pool.
   java.sql.SQLException: The url cannot be null
  </code></pre>
  
  <p>Looking at my properties file, both the dialect and the url are defined, and they're not being picked up, which is leading me to believe that the file isn't being ready.</p>
  
  <p>My application class incase it helps:</p>
  
  <pre><code>@SpringBootApplication
  public class Application extends SpringBootServletInitializer {
  
      public static void main(String[] args) {
          ApplicationContext ctx = SpringApplication.run(Application.class, args);
      }
  
  }
  </code></pre>