How to Print Stack Trace via Script

The SN Nerd · ‎10-07-2015

Does anyone know if it is possible to print a stack trace out from a try/catch? I want to find out the line of code to store in an error record for my application.

Example code:

try {
         var gr = new GlideRecord('incident');
         var test = gr.madeUpFunction();
         test.adssad();
} catch (e) {
         var stackTrace = e.????;
         gs.print('Stack trace: ' + stackTrace);
}

Expected output:

Evaluator: org.mozilla.javascript.EcmaError: "est" is not defined.

Caused by error in script at line 4

1:

2: var gr = new GlideRecord('incident');

3: var test = gr.madeUpFunction();

==> 4: est.adssad();

Evaluator: org.mozilla.javascript.EcmaError: "est" is not defined.

Caused by error in script at line -1

ServiceNow Nerd
ServiceNow Developer MVP 2020-2022
ServiceNow Community MVP 2019-2022

bernyalvarado · ‎10-08-2015

Hi Paul, the following is what I believe you have available for an exception:

try { 


         var gr = new GlideRecord('incident'); 


         madeUpVariable.madeUpFunction(); 


} catch (e) { 


         gs.print('LineNumber :' + e.lineNumber);


         gs.print('SourceName :' + e.sourceName);


         gs.print('Name: ' + e.name);


         gs.print('Message : ' + e.message);       


}

outcome:

*** Script: LineNumber :3

*** Script: SourceName :<refname>

*** Script: Name: ReferenceError

*** Script: Message : "madeUpVariable" is not defined.

Thanks,

Berny

View solution in original post

The SN Nerd · ‎10-07-2015

P.S.

e.stack returns undefined

ServiceNow Nerd
ServiceNow Developer MVP 2020-2022
ServiceNow Community MVP 2019-2022

sergiu_panaite · ‎10-08-2015

Hi Paul,

GlideLog has a method for dumping the stack trace in the log files:

GlideLog.dumpStack();

Regards,

Sergiu

The SN Nerd · ‎10-08-2015

Ironically, an exception is thrown when I try and use that method.

Attempted script access to inaccessible member denied - com.glide.util.Log:dumpStack:()V

Evaluator: java.lang.SecurityException: Illegal access to method dumpStack() in class com.glide.util.Log

Caused by error in script at line 9

6: gss.fakeMethod();

7:

8: } catch (e) {

==> 9: GlideLog.dumpStack();

10: gs.print('caught' + e );

11:

12:

Evaluator: java.lang.SecurityException: Illegal access to method dumpStack() in class com.glide.util.Log

Caused by error in script at line -1

Background message, type:error, message: Illegal access to method dumpStack() in class com.glide.util.Log

Anyway, I'm looking for a way to capture the output of the stack trace of the last caught exception so I can put it in my own logs.

I need to store it as a string temporarily.

The log files are not reliable enough.

Does anyone have any ideas?

ServiceNow Nerd
ServiceNow Developer MVP 2020-2022
ServiceNow Community MVP 2019-2022

sergiu_panaite · ‎10-08-2015

Paul,

What about this type of exercise:

try {


       foo.somethingThatThrows();


} catch (err) {


       gs.error("There was an error doing something", err);


}

gives me on my own instance:

[0:00:00.004] Script completed in scope global: script

*** Script: There was an error doing something: ReferenceError: "foo" is not defined.: no thrown error

Is this good enough?

Regards,

Sergiu