RollbackException hiding other exceptions in WL 5.1
Hi,
over here we're using Javlin (www.exceloncorp.com) as data resource under
Weblogic 5.1.0 (latest SP). One of the characteristics of Javlin is that it
can throw a com.odi.jmtl.GlobalTransaction.AbortAndRetryException during
commit. This exception means that the transaction should be retried.
However, Weblogic 5.1 transforms this exception when it occurs into a
javax.transaction.RollbackException. The only possibility I have found to
test whether this exception actually occurred is by using the following
hack:
try {
do_service_call();
} catch (UnexpectedException e) {
if (isJavlinRollbackException(e))
retry;
else throw e;
private boolean isJavlinRollbackException(UnexpectedException e) {
if (!(e.detail instanceof RollbackException))
return false;
String msg = e.detail.getMessage();
return ((msg != null) &&
(msg.indexOf("com.odi.jmtl.GlobalTransaction$AbortAndRetryException") >=
0));
Under Weblogic 4.5, there simply was no RollbackException and I could easily
test as follows:
try {
do_call_to_bean();
} catch (TransactionRolledbackException e) {
if (e.detail instanceof
com.odi.jmtl.GlobalTransaction.AbortAndRetryException) {
... retry ...
I was wondering whether there is a more appropriate way to see whether the
exception has occurred under WL 5.1. And if there is not, if this is a
problem with Javlin or with Weblogic or with EJB.
thanks,
Bert
WebLogic has acknowledged that this is a bug and is supposedly fixed in 6.0.
I've been trying to get them to give me a patch for this for 5.1 as this
makes it really difficult to provide an adequate user-level error message in
certain situations. It would add fuel to the fire if you would also file a
bug report with BEA and request a patch..
-brian
"Bert" <[email protected]> wrote in message
news:[email protected]...
> Hi,
>
> over here we're using Javlin (www.exceloncorp.com) as data resource under
> Weblogic 5.1.0 (latest SP). One of the characteristics of Javlin is that
it
> can throw a com.odi.jmtl.GlobalTransaction.AbortAndRetryException during
> commit. This exception means that the transaction should be retried.
>
> However, Weblogic 5.1 transforms this exception when it occurs into a
> javax.transaction.RollbackException. The only possibility I have found to
> test whether this exception actually occurred is by using the following
> hack:
>
>
> try {
> do_service_call();
> } catch (UnexpectedException e) {
> if (isJavlinRollbackException(e))
> retry;
> else throw e;
> }
>
> private boolean isJavlinRollbackException(UnexpectedException e) {
> if (!(e.detail instanceof RollbackException))
> return false;
> String msg = e.detail.getMessage();
> return ((msg != null) &&
> (msg.indexOf("com.odi.jmtl.GlobalTransaction$AbortAndRetryException") >=
> 0));
> }
>
> Under Weblogic 4.5, there simply was no RollbackException and I could
easily
> test as follows:
>
> try {
> do_call_to_bean();
> } catch (TransactionRolledbackException e) {
> if (e.detail instanceof
> com.odi.jmtl.GlobalTransaction.AbortAndRetryException) {
> ... retry ...
>
>
> I was wondering whether there is a more appropriate way to see whether the
> exception has occurred under WL 5.1. And if there is not, if this is a
> problem with Javlin or with Weblogic or with EJB.
>
> thanks,
>
> Bert
>
>
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In Invoice monito system pls check the what setting is done for Duplicate invoice, Missing GR and other invoice.
Based on these setting only system identifies what type of exception it is.
In other errors you should mention in Settings for Invoice Monitor what are the fileds your consider for other exception.
Hope this information will help.
Thanks & Best regards
Girish -
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Thanks.937643 wrote:
Ok. But. Do you think that in these cases the use of a runtime exception could be considered a bad practice?That's actually a matter of some debate.
On the one hand, Java has defined two major kinds of exceptions since the very beginning (unchecked exceptions, which are RuntimeException, Error, and their descendants; and checked exceptions which are everything else). The intended use of those was that checked exceptions should be for things that can normally go wrong in the execution of a program, even without a bug or without a major internal JVM error, such as a failed attempt to persist something or a network connection dropping--stuff that a programmer might normally be expected to deal with; while unchecked exceptions were created for things that a programmer would not normally handle in his code (except possibly at major architectural boundaries), like buggy code or an internal JVM failure.
With the rule about having to catch or declare checked exceptions, but not unchecked ones, that makes it easy for programmers so say, "Okay, I know exactly what can go wrong here that I might be expected to handle and I can therefore choose what to do with it; there will be no surprises. But I don't have to deal with problems that are outside my normal responsibility, like somebody passing me a null when they shouldn't have." It gives a programmer a nice bit of control, and the ability to know he hasn't missed something, kind of like the type safety provided by a strongly typed language.
At least that's the theory.
In practice, most checked exceptions either just get bubbled up to the next layer (via a throws clause), or caught wrapped in a fairly generic layer-appropriate exception and rethrown. There's not a whole lot of use made of what checked exceptions provide, and there's a lot of ugly boilerplate code that doesn't do anything useful for the app but is just there to satisfy the compiler.
So, some people think that checked exceptions are useless, or mostly useless, and favor unchecked exceptions in most or all cases. I believe that's part of the philosophy of Spring, but I'm not totally sure.
The idea is that since most of the time you can't do anything about exceptions that might be thrown to you, it's wasteful and pointless to have all that code to catch and rethrow. In this viewpoint, it would be better if, for example, not providing a throws clause at all meant that you could throw any exception. Any given code can still catch specific exceptions that it knows it can handle, but we don't have to write a bunch of code notating something that we're not really doing anything about.
Personally, I used to be totally in the checked exception camp. However, all the pointless boilerplate is wearing me down. I'm still not completely convinced though, and here's why: If I'm calling a method, I'd like to at least be able to see what might go wrong, so that I can decide how to deal with it. If all exceptions were unchecked, and the throws clause were optional, a conscientious developer could still provide it, and list the unchecked exceptions his method might throw to me, and/or he could document them in the javadoc comments. But a lot of developers won't do that, or even if they start to, as their method evolves, without the compiler to enforce it, they won't keep it up to date.
So there are advantages to both approaches. I personally would to know that the information will always be available to me, but for the small percentage of the time where I actually use it (like handle one specific exception one way and some other exception differently), I'm not sure if it's worth the overhead. -
Exception Handling - WHEN OTHERS
Good Day to All,
When i am running a procedure in TOAD-Expert... it says below message.
*'Avoid using a WHEN OTHERS clause in an exception section without any other specific handlers.'*
PROCEDURE...
IS
BEGIN
EXCEPTION
WHEN OTHERS THEN
ROLLBACK;
-- Checking whether cursor is open
IF cur%ISOPEN THEN
CLOSE cur;
END IF;
UPDATE TABLE
SET COL..
WHERE ...
COMMIT;
RAISE;
END procedure;The manner in which you are dealing with the exception is not wrong. Your handler does a couple of things:
- rollbacks the existing transaction as failed
- attempts resource protection (guard against resource leakage)
- logs the error
- re-raises the exception
None of these are invalid actions when dealing with an exception.
A suggestion though - move the UPDATE out of the exception and create a procedure that performs the logging for you (as an autonomous transaction). This way you have a reusable logging code unit that can be called from anywhere in your code.
Resource protection for explicit cursors are also not that critical in PL/SQL - as cursor handles that go out of scope are automatically released. The exception being a ref cursor handle. Of course, you need to resource protect other handles (like socket and file handles). And seeing that PL/SQL does not offer resource protection blocks, the only alternative is to use the "+when OTHERS+" exception handler for that. -
On my I pad cannot get mail. Screen says 'the connection to server failed.No problem with others except I cannot get new apps.
Hi David,
Based on your description of the issues, you may want to verify that you have an active network connection (either WiFi or cellular). You may find the following articles helpful:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
Regards,
- Brenden
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