Problems with a Java Trigger

Question

Hello Everyone
I need to create a TRIGGER, and i want to use Java.
this is my java class:
import ...
public class manager {
public static void triggerOnDeleteUser(int u_id){
long dat=(long)System.currentTimeMillis();
try{
#sql{ DELETE FROM apn a WHERE (0 = (SELECT COUNT(*) FROM apn_auth aa WHERE (aa.a_id = a.a_id AND u_id <> :u_id))) };
#sql{ DELETE FROM charging_info c WHERE (0 = (SELECT COUNT(*) FROM users u WHERE (u.charging_set = c.c_id AND u.u_id <> :u_id))) };
#sql{ INSERT INTO test VALUES(:dat) };
#sql{ COMMIT };
}catch(Exception E){E.printStackTrace(); }
this is wrapper procedure:
CREATE OR REPLACE PROCEDURE TR1
(p1 IN NUMBER) AS LANGUAGE JAVA NAME 'manager.triggerOnDeleteUser(int)';
and this is TRIGGER:
CREATE OR REPLACE TRIGGER OnDeleteUser
BEFORE DELETE ON USERS
FOR EACH ROW
CALL TR1(:old.U_ID)
U_ID is a NUMBER column.
When I DELETE on USERS table, trigger doesn't work properly, but if I try this:
SQL> EXEC TR1(3)
STORED PROCEDURE works!!!
I try to change trigger in this way:
CREATE OR REPLACE TRIGGER OnDeleteUser
BEFORE DELETE ON USERS
FOR EACH ROW
DBMS_OUTPUT.PUT_LINE (:old.U_ID + 1)
and it works properly!! (I user +1 to try if was really a NUMBER)...
Maybe I forget some permissions....? Any idea?
Thanks in advance
Dario

Answer 1

thanks, but i solved my problem.
I was triying to access a table during its modification (SELECT from USERS)
I change TRIGGER DECLARATION in this way:
CREATE OR REPLACE TRIGGER OnDeleteUser
BEFORE DELETE ON USERS
FOR EACH ROW
DECLARE
     PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
     TR1(:old.U_ID);
     COMMIT;
END;
/