Table is locked by app server

Question

I am using MS SQL Server 2000 with MS SQL Server JDBC Driver and JBoss 3.2.3.
I have a stored procedure. This stored procedure does one insert in Table1 and multiple inserts in Table2. The stored procedure starts with a begin transaction; if any of the inserts fails (I check @@error) then i rollback transaction; if everything works ok then i do a commit transaction.
I have a Stateless Session Bean one of its method is calling this stored procedure.
If the stored procedure runs successfully then every thing is ok. But if one of the inserts in stored procedure fails, i see 2 bad things happening:
* no SQLException is thrown
* the Table1 gets locked and only unlocks when i close application server.
Any explanation?
Thanks

Answer 1

ok to perform simple tests, I:
* create 2 identical tables "ttt" and "ttt1" for testing purpose with each's one column not accepting nulls:
CREATE TABLE [dbo].[ttt] (
     [id] [int] IDENTITY (1, 1) NOT NULL PRIMARY KEY,
     [col1] [varchar(50)] NULL ,
     [col2] [varchar(50)] NULL ,
     [col3] [varchar(50)] NOT NULL )
CREATE TABLE [dbo].[ttt1] (
     [id] [int] IDENTITY (1, 1) NOT NULL PRIMARY KEY,
     [col1] [varchar(50)] NULL ,
     [col2] [varchar(50)] NULL ,
     [col3] [varchar(50)] NOT NULL ) * Simplify the stored proc to insert one row in ttt and one row in ttt1. The ttt row will be successfully inserted while ttt1 row insertion will fail as i try to insert null in a non-null column:
CREATE  PROCEDURE ta_ProcessPayroll
AS
BEGIN
declare @v_CommitTransaction     int
declare @v_ErrorCode          int
declare @v_ErrorMessage     varchar(300)
SET NOCOUNT OFF
SET @v_CommitTransaction = 0
SET @v_ErrorCode = 0
-- Manage separate transaction if not invoked from within another transaction.
if ( @@trancount = 0 )
begin
     begin transaction ta_ProcessPayroll
     set @v_CommitTransaction = 1
end
insert into ttt (col1, col2, col3) values ('A', 'B', 'C')
set @v_ErrorCode = @@error
if ( @v_ErrorCode <> 0 )
begin
     set @v_ErrorMessage = cast( @@PROCID as varchar(300) )+ ': failed with error code ' + cast( @v_ErrorCode as varchar(20) )
     goto error_handler
end
insert into ttt1 (col1, col2, col3) values ('A1', 'B1', null)
set @v_ErrorCode = @@error
if ( @v_ErrorCode <> 0 )
begin
     set @v_ErrorMessage = cast( @@PROCID as varchar(300) )+ ': failed with error code ' + cast( @v_ErrorCode as varchar(20) )
     goto error_handler
end
if ( @v_CommitTransaction = 1 )
begin
     commit transaction ta_ProcessPayroll
end
error_handler:
if ( @v_ErrorCode <> 0 )
begin
     if ( @v_CommitTransaction = 1 )
     begin
          rollback transaction ta_ProcessPayroll
     end
     RAISERROR( @v_ErrorMessage, 16, 1 )
end
END
GO* use this java code in a SSB's method to execute the stored proc :
Connection conn = null;
CallableStatement stmt = null;
try {
  conn = ConnectionHelper.getConnection(); // get connection (use JNDI)
  stmt = conn.prepareCall("{call ta_ProcessPayroll()}");
  stmt.execute();
} catch (SQLException sqle) {
  sqle.printStackTrace();
} finally {
}Now I execute the stored proc through my java code and get the SQLException but the table ttt gets locked while table ttt1 does not get locked.
I checked it through query analyzer tool of sql server by typing " select * from ttt " and it hangs instead of giving me result set until i cancel it. No such thing happens when i type " select * from ttt1 " in query analyzer. When I type "select * from ttt with (nolock)" I can see the row being inserted by my stored proc.
Now here is what I observe:
* If i shut down my JBoss right away the lock on ttt gets released. When I query it there is no data in it which is good as the transaction gets rollback.
* If I dont shut down my JBoss and instead go to another jsp in the same web application which retrieves data from another table, then the llock on ttt gets released. But when I query it I can see 1 row in there which was put by my stored proc. So the transaction do not gets rollback.
I have a feeling I am missing some thing on my java code side. Please explain.
Thanks