Howdy people ...
I have been building a client application that needs to manipulate several
tables through CMP Entity beans ... I read the post on 4/29 about
UserTransaction getting added to the JBOSS source. I downloaded yesterday's
snapshot of JBOSS (jboss-cvs.zip (5-23-01)) and took a crack at it ..
I am using:
Sun JDK 1.3
PostGreSQL 7.1
Windows 2000 Server
my CMP Entity Bean has a "Required" transaction attribute
Here's the summary of my problem: After issuing the commit() on the
transaction object, my changes are gone forever..
My usage of UserTransaction is simple ... I start a transaction with begin()
... then i go to the home interface and use a finder to get a bunch of
objects ... I grab the first object in the enumeration, do some hullabaloo
with it, then do a "setRecord" (it just a shortcut to set all of the bean's
fields) .. then i issue a commit() ... i've trimmed out some stuff to make
the following readable. The name of my bean is "Event" ... (yah, probably a
bad name, but whatever... ;)) ...
try{
initialContext = new InitialContext(env);
log("Got initial context...");
eventHome =
(EventHome)getHome(initialContext,"myblah/Event",EventHome.class);
log("Got EventHome interface...");
trans =
(UserTransaction)getHome(initialContext,"UserTransaction",UserTransaction.cl
ass);
log("Got UserTransaction interface");
}
catch(NamingException e){
log("NamingException during run() method initialization! " + e);
return;
}
Event event = null;
int eventNumber = 0;
while(event != null || eventNumber++ == 0)
{
//We need to begin the transaction here ... if we don't, then the
//call to findByStatus...() is considered part of a different transaction
//and is not encapsulated ...
try{ //Transaction block
trans.begin();
log("Transaction begun...");
//Let's try to find an event
try{
Enumeration eventList =
eventHome.findByStatusOrderByPriority(EventRecord.STATUS_NEW);
//Reset the event
event = null;
//Grab the highest priority event out of the Enumeration
if(eventList != null && eventList.hasMoreElements())
event = (Event)eventList.nextElement();
}
catch(FinderException fe){;}
catch(RemoteException re){
log("RemoteException while trying to get list of pending
events! " + re);
}
//If an event was found, handle it
if(event != null)
{
EventRecord eventRec = event.getRecord();
log("This event is outstanding:" + eventRec.event_id);
//log(eventRec.toString());
//Biz logic here ....
eventRec.update_date = new
Timestamp(System.currentTimeMillis());
if(EventRecord.STATUS_COMPLETE.equals(eventRec.status))
eventRec.completion_date = eventRec.update_date;
log("-----------BEFORE UPDATE---------");
log(eventRec.toString());
event.setRecord(eventRec);
log("-----------AFTER UPDATE---------");
log(event.getRecord().toString());
log("EventRecord has been updated...");
}
//Unless an exception was thrown, commit it
trans.commit();
log("Transaction committed...");
log("-----------AFTER COMMIT---------");
log(event.getRecord().toString());
}
catch(Exception e){
log("Exception caught during event handling block! " + e);
try{
trans.rollback();
log("Transaction rollback succeeded...");
}
catch(Exception rbe){
log("Rollback failed!!!");
}
}
}
Here's what gets output:
-----------------------------------------------------------------------begin
Trying to create InitialContext...
Got initial context...
lookup name: myblah/Event
Got EventHome interface...
lookup name: UserTransaction
Got UserTransaction interface
Transaction begun...
This event is outstanding:5
-----------BEFORE UPDATE---------
event_id = 5
creation_date = 2001-05-23 15:45:59.35
start_after_date = 2001-05-23 15:45:59.35
update_date = 2001-05-24 15:19:27.731
completion_date = null
event_priority = 50
event_type = CatalogItemEvent
status = ERROR
status_detail =
-----------AFTER UPDATE---------
event_id = 5
creation_date = 2001-05-23 15:45:59.35
start_after_date = 2001-05-23 15:45:59.35
update_date = 2001-05-24 15:19:27.731
completion_date = null
event_priority = 50
event_type = CatalogItemEvent
status = ERROR
status_detail =
EventRecord has been updated...
Transaction committed...
-----------AFTER COMMIT---------
event_id = 5
creation_date = 2001-05-23 15:45:59.35
start_after_date = 2001-05-23 15:45:59.35
update_date = null
completion_date = null
event_priority = 50
event_type = CatalogItemEvent
status = NEW
status_detail = null
Transaction begun...
This event is outstanding:5
------------------------------------------------------------------------snip
<on and on we go> ... notice how the AFTER COMMIT snapshot of the bean has
rolled back to the previously committed version
There are no exceptions thrown ... everything seems dandy ... but for the
fact that my changes don't get committed, i'd be quite happy .. ;) ..
What else can I do to debug this problem? My entrance into the world of open
source and J2EE is rather recent so I don't even know where to begin looking
at source code. I've tried a bunch of things ... moving the begin() and
commit() calls to different sections of the application (just wrapping the
setRecord() call, for instance) .. without using UserTransaction, my changes
get committed just fine (without the possibility of rollback, of course) ...
so my bean seems to be fine ...
Any thoughts?
Thanks in advance.
-Dave
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