title: Unable to get a specific properties with @ConfigurationProperties
body: <p>I would like to retrieve a property but when a dot is used, I can't, I get null, 
  Is there a way to do it still using @ConfigurationProperties ?</p>
  
  <p>See the example:</p>
  
  <pre><code>@Component
  @ConfigurationProperties(prefix = "prop.foo")
  public class Test {
      //This is working
      private String myVal;
      //This is not working
      private String barAnotherVal;
  
      public void setMyVal(String myVal) {
          this.myVal= myVal;
      }
      public void setBarAnotherVal(String barAnotherVal) {
          this.barAnotherVal= barAnotherVal;
      }
  }
  </code></pre>
  
  <p>application.properties:</p>
  
  <pre><code>prop.foo.myVal
  prop.foo.bar.anotherVal
  </code></pre>