#Error Handling

Introduction

If you're solving complex problems in ObjectScript, you probably have a lot of code that works with %Status values. If you have interacted with persistent classes from an object perspective (%Save, %OpenId, etc.), you have almost certainly seen them. A %Status provides a wrapper around a localizable error message in InterSystems' platforms. An OK status ($$$OK) is just equal to 1, whereas a bad status ($$$ERROR(errorcode,arguments...)) is represented as a 0 followed by a space followed by a $ListBuild list with structured information about the error. $System.Status (see class reference) provides several handy APIs for working with %Status values; the class reference is helpful and I won't bother duplicating it here. There have been a few other useful articles/questions on the topic as well (see links at the end). My focus in this article will be on a few debugging tricks techniques rather than coding best practices (again, if you're looking for those, see links at the end).

A beginner’s guide to Exception Handling in RESTful web services. The article gives an example how the various error conditions during processing a service request can be handled.

We expect our client – server communication working in a flawless operational condition, running error free software. But we are prepared to handle exceptions. Are we? So far in the examples of the previous sessions were not. We did not care about exceptions. The result? In any error incident it took ages to figure out what the problem is and more importantly how to fix it.

How can I prevent large number truncation when using the DynamicObject and DynamicArray classes to create JSON in objectscript and then parsing the result in javascript. Are there any global settings that configure the output when using these classes?

I am looking at converting to the new DynamicObject and DynamicArray classes to build JSON. Our current (homegrown) JSON library forces string representation of numbers too long because of errors we were seeing with long numbers being truncated on the client, I am hoping to accomplish the same with the new classes.

Hi developers!

Want to discuss with you the case of %Status.

If you familiar with ObjectScript you know what is it. I'd love to hear the history of the case why it had appeared in ObjectScript but it turned out that almost every system/library classmethods return %Status and there is a whole set of tools to deal with it.

What is does it gives you the responsibility to check the value or %Status of every system method you call.

E.g. if you save the data of the persistent class, you should never call like this:

do obj.%Save()

you need to call:

set sc=obj.%Save()

if $$$ISERR(sc) do // something or quit.

Hello All,

Hi

We have multiple edge production namespaces and want to run query to get errors/alerts from Ens_Util.Log table across namespaces. is it possible?

Error management on InterSystems languages has been evolving along time. Next, we will show the different implementations and why you should use the TRY/THROW/CATCH mechanism.

You can read official error recommendations here.

Some of you might not be aware of this "Known Issue/Limitation" when defining a BPL-based Business Process.

And those who are not might have encountered this (somewhat "unpleasant" error):

Hello,

I used the operation : EnsLib.EMail.AlertOperation to send mail to handle error. However, I want to get more information about the error (session ID message, the date, the namespace... etc).

what is the best way to do it?

I tried to add informations in OnAlertRequest method as below but I need to change mail operation from all namespaces...

The intersystems documentation gives the same description for both <MAXSTRING> and <NETWORK DATA UPDATE FAILED - MAXSTRING>. I suspect that the description for <MAXSTRING> is correct and the description for <NETWORK DATA UPDATE FAILED - MAXSTRING> was an accident. I would like to know what situation triggers the <NETWORK DATA UPDATE FAILED - MAXSTRING> error.

I need assistance to delete an instance of HealthShare that I am sure it way out of date. From the VM Server Control Panel when I try to Uninstall, I get the error Message: "Error: Could not detect INSTANCE name!"

Are there commands in SQL that may help uninstall the instance of the application? Other Suggestions?

Hi,

While HL7 Errors ACKs come back in the soap response, the HL7v2 Error ACK message is not processed.

I used the SOAP Wizard to construct my classes, but the generated code doesn't handle the HL7v2 ACK.
Does health Connect have a class that handles this?

Failing an official solution should I go ahead and make make my own classes based on EnsLib.HL7.Operation.TCPOperation, but wrapping it with the generated SOAP handling code.

How have others dealt with this?

Hi,

When i am using $$$LOGERROR("Message is Discarded") in the class i am getting "Referenced Macro Not defined" error

Can you help me how to use $$$LOGERROR in a class

Thanks,

Smythee