@Target({TYPE, METHOD, FIELD})
 @Retention(RUNTIME)
 public @interface Converter {
    String name();
    Class converterClass(); 
 }

 @Entity
 public class Employee implements Serializable{
     ...
     @Basic
     @Converter (
         name="genderConverter",
         converterClass=org.myorg.converters.GenderConverter.class
     )
     @Convert("genderConverter")
     public String getGender() {
         return gender;
     }
     ...
 }