Error-handling when making Web Services

frande

Hello,

I am currently working on designing a system that at first only should be runned on the NAV Classic client.
However in the short future we will proparly have to make it web-based too through Web Services.

I have a question on how the web-based system reacts if an ERROR(text) is made on a NAV codeunit-object.
Can I catch that error through and try-catch-sentence, or how to I do that?

I have been searching the WWW, but I cannot find any good explanations that helps me answer the question.

Thank you in advance,

Kristian.

kriki

The webservices catches the error-message and sends it to the client who asked for the service in case the client waits for a reply from the webservice.
Otherwise it just errors and the webservice stops running this request and waits for other requests.
If you want to avoid the erroring, you can run a codeunit that runs the real codeunit is follows:

IF CODEUNIT.RUN(CODEUNIT::"Codeunit to be run") THEN
  ....
ELSE
  ...

frande

Hello kriki,

Thank you for your response.

As you said if the client waits for a reply from the webserver it will catch the error-message.
Does it catch the error-message with a try-catch-statement, or?

Thank you in advance,

Kristian.

ara3n

Yes if you need to catch at the client side that consumes the webservice, you need to do it with a try-catch-statement.

freddy.dk

and as an add-on to this answer all transactions are rolled back if an exception is raised when invoking code in web services.

kriki

freddy.dk wrote:

and as an add-on to this answer all transactions are rolled back if an exception is raised when invoking code in web services.

That means : EVEN IF YOU HAVE A COMMIT IN IT!

We hit that bug. And we are proposing to make it into a feature! It can be really useful to have it also in the standard client. Especially if it works like LOCKTIMEOUT. There is also a fix for it.

frande

Hello,

Thanks everybody for your help and your answers.

Im guided in the right direction towards designing the application.

Have a nice day!