Errors in sdo_util on 12c

Question

I have installed spatial on an Oracle 12C database and I am receiving the error below when using sdo_util.to_wktgeometry. Some of the other sdo_util functions work as expected. I checked the class files and they are all valid. Has anyone else encountered this error.
ORA-29531: no method structToWktJS in class oracle/spatial/util/Adapters
ORA-06512: at "MDSYS.SDO_JAVA_STP", line 350
ORA-06512: at "MDSYS.SDO_UTIL", line 2813
ORA-06512: at "MDSYS.SDO_UTIL", line 2836
29531. 00000 -  "no method %s in class %s"
*Cause:    An attempt was made to execute a non-existent method in a
           Java class.
*Action:   Adjust the call or create the specified method.

Answer 1

I am not getting any error, as shown below, using a few excerpts from the online documentation.  Can you run the same or similar script without error?  Can you post a run of a test case that does produce the error for you?
SCOTT@orcl12c> set long 2000;
SCOTT@orcl12c> SELECT banner FROM v$version;
BANNER
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
PL/SQL Release 12.1.0.1.0 - Production
CORE    12.1.0.1.0    Production
TNS for 64-bit Windows: Version 12.1.0.1.0 - Production
NLSRTL Version 12.1.0.1.0 - Production
5 rows selected.
SCOTT@orcl12c> CREATE TABLE cola_markets
  2    (mkt_id    NUMBER PRIMARY KEY,
  3      name    VARCHAR2(32),
  4      shape    SDO_GEOMETRY);
Table created.
SCOTT@orcl12c> INSERT INTO cola_markets VALUES
  2    (2, 'cola_b',
  3      SDO_GEOMETRY
  4        (2003, NULL, NULL,
  5         SDO_ELEM_INFO_ARRAY (1,1003,1),
  6         SDO_ORDINATE_ARRAY(5,1, 8,1, 8,6, 5,7, 5,1)));
1 row created.
SCOTT@orcl12c> INSERT INTO user_sdo_geom_metadata (TABLE_NAME, COLUMN_NAME, DIMINFO, SRID) VALUES
  2    ('cola_markets', 'shape',
  3      SDO_DIM_ARRAY
  4        (SDO_DIM_ELEMENT('X', 0, 20, 0.005),
  5         SDO_DIM_ELEMENT('Y', 0, 20, 0.005)),
  6      NULL);
1 row created.
SCOTT@orcl12c> CREATE INDEX cola_spatial_idx ON cola_markets(shape) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
Index created.
SCOTT@orcl12c> SELECT SDO_UTIL.TO_WKTGEOMETRY (shape) FROM cola_markets WHERE name = 'cola_b';
SDO_UTIL.TO_WKTGEOMETRY(SHAPE)
POLYGON ((5.0 1.0, 8.0 1.0, 8.0 6.0, 5.0 7.0, 5.0 1.0))
1 row selected.