[DERBY-26] Dropping a nested trigger and rerunning the querry causes NullPointerException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 10.0.2.0
• Component/s: SQL
• Assignee: Yip Ng
• Reporter: Ramandeep Kaur
• Created: 01/Oct/04 18:42
• Updated: 03/Jan/07 21:14
• Resolved: 03/Jan/07 21:13

Description

Opening this bug on behalf of Satheesh Babdaram.

----------------------------------------------------------
Dropping a nested trigger and reruning the orignial query
causes NullPointerException. Here is the test case, with
pointers to incorrect behaviour:

ij> – test the default (should be 16)
create table t1 (x int);
0 rows inserted/updated/deleted
ij> create table t2 (x int);
0 rows inserted/updated/deleted
ij> create table t3 (x int);
0 rows inserted/updated/deleted
ij> create table t4 (x int);
0 rows inserted/updated/deleted
ij> create table t5 (x int);
0 rows inserted/updated/deleted
ij> create table t6 (x int);
0 rows inserted/updated/deleted
ij> create table t7 (x int);
0 rows inserted/updated/deleted
ij> create table t8 (x int);
0 rows inserted/updated/deleted
ij> create table t9 (x int);
0 rows inserted/updated/deleted
ij> create table t10 (x int);
0 rows inserted/updated/deleted
ij> create table t11 (x int);
0 rows inserted/updated/deleted
ij> create table t12 (x int);
0 rows inserted/updated/deleted
ij> create table t13 (x int);
0 rows inserted/updated/deleted
ij> create table t14 (x int);
0 rows inserted/updated/deleted
ij> create table t15 (x int);
0 rows inserted/updated/deleted
ij> create table t16 (x int);
0 rows inserted/updated/deleted
ij> create table t17 (x int);
0 rows inserted/updated/deleted
ij> create trigger tr1 before insert on t1 for each row MODE
DB2SQL insert into t2 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr2 before insert on t2 for each row MODE
DB2SQL insert into t3 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr3 before insert on t3 for each row MODE
DB2SQL insert into t4 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr4 before insert on t4 for each row MODE
DB2SQL insert into t5 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr5 before insert on t5 for each row MODE
DB2SQL insert into t6 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr6 before insert on t6 for each row MODE
DB2SQL insert into t7 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr7 before insert on t7 for each row MODE
DB2SQL insert into t8 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr8 before insert on t8 for each row MODE
DB2SQL insert into t9 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr9 before insert on t9 for each row MODE
DB2SQL insert into t10 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr10 before insert on t10 for each row MODE
DB2SQL insert into t11 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr11 before insert on t11 for each row MODE
DB2SQL insert into t12 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr12 before insert on t12 for each row MODE
DB2SQL insert into t13 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr13 before insert on t13 for each row MODE
DB2SQL insert into t14 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr14 before insert on t14 for each row MODE
DB2SQL insert into t15 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr15 before insert on t15 for each row MODE
DB2SQL insert into t16 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr16 before insert on t16 for each row MODE
DB2SQL insert into t17 values 666;
0 rows inserted/updated/deleted
ij> create trigger tr17 before insert on t17 for each row MODE
DB2SQL values 1;
0 rows inserted/updated/deleted

*******Here we go
ij> insert into t1 values 1;
ERROR X0Y73: The maximum trigger recursion level of 16 was exceeded
while processing statement: 'insert into t17 values 666'.

********prove it
ij>select * from t1;
X

********INCORRECT BEHAVIOUR STARTS FROM HERE. Droping tr17 should
make the insert pass, but it doesn't. Still raises MaximumRecursionException.

ij> drop trigger tr17;
0 rows inserted/updated/deleted

********The following will fail
ij> insert into t1 values 1;
ERROR X0Y73: The maximum trigger recursion level of 16 was exceeded
while processing statement: 'insert into t2 values 666'.
ij>select * from t1;
X

Issue Links

• is related to: DERBY-2195 Nested triggers not working properly after maximum trigger count exception is thrown