A potential bug on the new feature (12c) of Identity Column?

Question

Hi,
I am testing a newly introduced feature of Identity Column in Oracle 12c. I used EclipseLink (JPA) to access the database.
I may have found a potential bug with this feature. I am getting "ORA-30667: cannot drop NOT NULL constraint on a DEFAULT ON NULL column" when I try to insert a row. My code doesn't explicitly drop "NOT NULL" constraint.
When I delete all the tables under the user and re-define the user and the tables, the error disappear.
Here are the details:
Error:
DatabaseException Internal Exception: java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1 ORA-30667: cannot drop NOT NULL constraint on a DEFAULT ON NULL column Error Code: 604 Call: INSERT INTO MyTable (ID, SOMEID, SOMEDATE) VALUES (?, ?, ?) bind => [null, 100100147, 2013-11-29 Query: InsertObjectQuery(cus.entity.MyTable@1a9ea5b)
Table definition:
CREATE TABLE MyTable (id NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY PRIMARY KEY,
      someId INT NOT NULL,
      someDate DATE NOT NULL,
      PARTITION BY range(someDate)
      interval(numtodsinterval(1,'year'))
      SUBPARTITION BY HASH ( someId)
      SUBPARTITIONS 20
       PARTITION p0 VALUES LESS THAN (TO_DATE('01-12-2013', 'DD-MM-YYYY'))
Could anyone tell me if there might be a bug associated with the new feature or if there was something wrong with my code?
I would be appreciated if anyone can help.

Answer 1

"here is a reproducible test case in the SCOTT schema - if it reproduces for you open an SR with Oracle"
Yes. I have just followed the instruction you posted and managed to re-produce the same error I reported earlier. Here are the details of the script output following your posted instruction:
table MYTABLE dropped.
purge recyclebin
table MYTABLE created.
1 rows inserted.
table MYTABLE dropped.
OBJECT_NAME                                                                                                                      ORIGINAL_NAME                                                                                                                    OPERATION TYPE                      TS_NAME                        CREATETIME          DROPTIME               DROPSCN PARTITION_NAME                                                                                                                   CAN_UNDROP CAN_PURGE    RELATED BASE_OBJECT PURGE_OBJECT      SPACE
BIN$6NCDTxmXTb2QBpUWF0kGqw==$0                                                                                                   SYS_C0010655                                                                                                                     DROP      INDEX                     USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030808                                                                                                                                  NO         YES            98789       98789        98812          8
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:30:56 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98790       98789        98789          0
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                                  NO         NO             98833       98789        98789       1024
BIN$Ka0sgN7XRBeCsjyXTQ76cA==$0                                                                                                   MYTABLE                                                                                                                          DROP      Table Composite Partition USERS                          2013-12-01:10:31:37 2013-12-01:10:32:17    4030812                                                                                                                          &