ORA-04020 dead lock ?

Question

I have two procedures need to call each other, like:
create or replace procedure A
as
begin
B;
end A;
create or replace procedure B
as
A;
end B;
when I compiled them, I got a message saying that deadlock detected.
If I have the logic like that, and procs A and B are defenitely needed, how can I handle this issue?
Thanks

Answer 1

An interesting change in 10G. Instead of the deadlock, it immediately reports the compilation errors and running either of the procedures generates an immediate "Object is invalid" error.
SQL> CREATE OR REPLACE PROCEDURE a (p_who IN VARCHAR2) AS
  2  BEGIN
  3     IF p_who <> 'B' THEN
  4        DBMS_OUTPUT.Put_Line('Call B');
  5     ELSE
  6        DBMS_OUTPUT.Put_Line('Called by B');
  7     END IF;
  8  END;
  9  /
Procedure created.
SQL> SHOW ERRORS
No errors.
SQL>
SQL> CREATE OR REPLACE PROCEDURE b (p_who IN VARCHAR2) AS
  2  BEGIN
  3     IF p_who <> 'A' THEN
  4        a('B');
  5     ELSE
  6        DBMS_OUTPUT.Put_Line('Called by A');
  7     END IF;
  8  END;
  9  /
Procedure created.
SQL> SHOW ERRORS
No errors.
SQL>
SQL> CREATE OR REPLACE PROCEDURE a (p_who IN VARCHAR2) AS
  2  BEGIN
  3     IF p_who <> 'B' THEN
  4        b('A');
  5     ELSE
  6        DBMS_OUTPUT.Put_Line('Called by B');
  7     END IF;
  8  END;
  9  /
Procedure created.
SQL> SHOW ERRORS
No errors.
SQL>
SQL> select object_name, object_type from user_objects where status <> 'VALID' ;
OBJECT_NAME                     OBJECT_TYPE
A                               PROCEDURE
B                               PROCEDURE
2 rows selected.
SQL> alter procedure a compile ;
Warning: Procedure altered with compilation errors.
SQL> show errors
Errors for PROCEDURE A:
LINE/COL ERROR
4/7      PL/SQL: Statement ignored
4/7      PLS-00905: object XXXXXXXX.B is invalid
SQL> alter procedure b compile ;
Warning: Procedure altered with compilation errors.
SQL> show errors
Errors for PROCEDURE B:
LINE/COL ERROR
4/7      PL/SQL: Statement ignored
4/7      PLS-00905: object XXXXXXXX.A is invalid
SQL> exec a ;
BEGIN a ; END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00905: object XXXXXXXX.A is invalid
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL> exec b ;
BEGIN b ; END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00905: object XXXXXXXX.B is invalid
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL> disconnect
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL>