The syncronize command is incorrect with enums.
To see the bug:
  1. Create a class like
       package m2test;
       public class NewClass implements java.sql.ResultSet { 
          public NewClass() {
          }   
       }
  2. Run syncronize
     The missing methodes are created. Try to build. It fails! 
     The error message is:
        ...m2test.NewClass is not abstract and does not override abstract method
        getObject(java.lang.String,java.util.Map<java.lang.String,
        java.lang.Class<?>>) in java.sql.ResultSet...
  3. This method is forgotten by the command. Try also the same with
     javax.sql.RowSet