ORA-04088: error during execution of trigger - additional errors - sql

Question

I have a blank table for which I've set up a trigger:
CREATE OR REPLACE TRIGGER authors_bir
BEFORE INSERT ON authors
FOR EACH ROW
begin
if upper(:new.name) = 'TEST' then
raise_application_error(-20001, 'Sorry, that value is not allowed.');
end if;
end;
After executing:
insert into AUTHORS
VALUES (1, 'test', '1-Jan-1989', 'M');
Why am I getting ORA-06512 and ORA-04088 error messages in addition to the expected ORA-20001 error prompt?
ErrorMessage
Error starting at line : 5 in command -
insert into AUTHORS
VALUES (1, 'test', '1-Jan-1989', 'M')
Error report -
ORA-20001: Sorry, that value is not allowed.
ORA-06512: at "RPS.AUTHORS_BIR", line 3
ORA-04088: error during execution of trigger 'RPS.AUTHORS_BIR'

Answer 1

Your trigger works perfectly and ORA-06512 is part of debugging mode and tells you what line of code raised that ORA-20001 that you coded. While ORA-04088 is saying that an error has occurred in the trigger. Both error codes are GENERIC part of oracle troubleshooting report.

Answer 2

According to documentation:
ORA-06512: at stringline string
Cause: Backtrace message as the stack is unwound by unhandled exceptions.
Basically, this error is part of the error stack telling at which line the actual error occurred.
And documentation:
ORA-04088: error during execution of trigger 'string.string'
Cause: A runtime error occurred during execution of a trigger.
And this error is a part of the error stack telling you that error actually occurred in a trigger.
When an unhandled error occurs, error stack is always displayed. If you want to display just the error message, you could use an exception handling part so body of the trigger would look something like this:
begin
if upper(:new.name) = 'TEST' then
raise_application_error(-20001, 'Sorry, that value is not allowed.');
end if;
exception
when others then
dbms_output.put_line(sqlcode|' '|sqlerrm);
end;