Using SQL Tacker one may see this error
Select OBJECT_NAME, OBJECT_TYPE, STATUS, SYS.DBMS_JAVA.LONGNAME(OBJECT_NAME) LONGNAME, LAST_DDL_TIME, OBJECT_ID, CREATED, '<USER>' OWNER
from sys.user_objects
where object_type in ('JAVA CLASS', 'JAVA SOURCE', 'JAVA RESOURCE', 'JAVA DATA')
Error occurred: [904] (ORA-00904: : invalid identifier)
Error occurred: [904] (ORA-00904: : identificador no válido)