If a class file contains RuntimeVisibleTypeAnnotations then jdec tool produces jcod file which has a wrong structure and can't be converted to the same class file. A new class file is longer than the old one.

A new class file causes the following:

...
        Attr(#26) { // RuntimeVisibleTypeAnnotations
          [] { // annotations
            { // type_annotation
              0x13; // target_type: FIELD
              [] { // type_paths
              }
              #0;
              [] { // element_value_pairs
                { // element value pair
                  #256;
                  { // element_value
                    0x1C; // invalid element_value
                  } // element_value
                } // element value pair
                ;
              } // element_value_pairs
            } // type_annotation
          }
// ======== attribute array started at 0x0348 has 3 bytes more:
          0x73001D;
        } // end RuntimeVisibleTypeAnnotations
      } // Attributes
    }
  } // Fields

//------- ClassFormatError: invalid element_value
  0x000500010005001E;
  0x0003001F00000016;
  0x000200020000000A;
  0x2AB700012A1BB500;
  0x07B1000000000020;
  0x0000000501000B00;
  0x00001A0000000F00;
  0x0116000000001B00;
  0x01001C73001D0001;
  0x001000210001001F;
  0x0000001300010001;
  0x000000072ABA000E;
  0x0000B00000000000;
  0x1100140022000100;
  0x1F00000013000100;
  0x01000000072ABA00;
  0x120000AC00000000;
  0x0011001800230001;
  0x001F000000140002;
  0x0002000000082A2B;
  0xBA00160000AC0000;
  0x00000001000B0022;
  0x0002001F00000011;
  0x0001000100000005;
  0x2AB4000DAC000000;
  0x0000240000000B00;
  0x01001B0001001C73;
  0x001D000400250000;
  0x0002002600270000;
  0x001C0001000B000C;
  0x0001001A0000000E;
  0x0001130000001B00;
  0x01001C73001D0028;
  0x0000000C00010029;
  0x0003000800300031;
  0x00320000000A0001;
  0x0033003500370019;
} // end class point