title: Model Mapper Java 11 Warning
body: <p>I develop a web service with spring boot and I use model mapper. I have changed my project sdk from jdk 1.8 to jdk 11 (oracle open jdk) and this warning is appeared:</p>
  <pre><code>WARNING: An illegal reflective access operation has occurred
  WARNING: Illegal reflective access using Lookup on org.modelmapper.internal.ProxyFactory (file:/home/omid/.m2/repository/org/modelmapper/modelmapper/2.3.8/modelmapper-2.3.8.jar) to interface java.util.Set
  WARNING: Please consider reporting this to the maintainers of org.modelmapper.internal.ProxyFactory
  WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
  WARNING: All illegal access operations will be denied in a future release
  </code></pre>
  <p>I config model mapper to skip some fields of some objects such as:</p>
  <pre><code>this.modelMapper.addMappings(new PropertyMap&lt;SourceObject, DestinationObject&gt;() {
          @Override
          protected void configure() {
              skip(destination.getField1());
              skip(destination.getField2());
          }
      });
  </code></pre>
  <p>I am using spring boot v2.2.6.RELEASE and modelmapper v2.3.8. Why does this error appear?</p>