In the javadoc header of the class javax.management.openmbean.MXBeanMappingFactory,
there is the following code sample :
 public class MyLinkedListMappingFactory implements MXBeanMappingFactory {
     public MyLinkedListMappingFactory() {}
....

This should be :
 public class MyLinkedListMappingFactory *extends* MXBeanMappingFactory {