java.sql.SQLSyntaxErrorException: ORA-00904: "columnName": invalid identifier

Mind letter case.

By default, names of all objects in Oracle are stored in uppercase, but you can reference them using any case you want. For example:

SQL> create table test (id number);

Table created.

SQL> insert into test (ID) values (1);

1 row created.

SQL> select iD from TeST;

        ID
----------
         1

SQL> select ID from test;

        ID
----------
         1

But, if you used double quotes and mixed case, then you have to use double quotes and exactly the same letter case, always:

SQL> create table "Test" ("iD" number);

Table created.

SQL> insert into test (id) values (1);
insert into test (id) values (1)
            *
ERROR at line 1:
ORA-00942: table or view does not exist


SQL> insert into "Test" (ID) values (1);
insert into "Test" (ID) values (1)
                    *
ERROR at line 1:
ORA-00904: "ID": invalid identifier


SQL> insert into "Test" ("ID") values (1);
insert into "Test" ("ID") values (1)
                    *
ERROR at line 1:
ORA-00904: "ID": invalid identifier


SQL> insert into "Test" ("iD") values (1);

1 row created.

SQL>

As of two errors you posted: they are the same. The only difference is that the 2nd shows owner (schema) name along with column name. Note that it is NOT database name (as "DB_Name" suggests); in Oracle, database is something different. If you're trying to make a relation between Oracle and some other DBMS', then what is a "database" there is "user" (or "schema") in Oracle.

Apart from that, no difference. ORA-00904 means that you're referencing a column which doesn't exist in that table. Again: mind letter case.