How to resolve the error - System.UnexpectedException: Script-thrown exception?
I'm trying to create an Apex callout and running into the following error message:
System.UnexpectedException: Script-thrown exception
My analysis shows that
System.UnexpectedException is not catchable in Apex.
There are some reports of exceptions with “Script-thrown exception” message by other users, but the exception type in those cases happen to be System.CalloutException. [1]
The only reported case of a System.UnexpectedException with the same message appears to be triggered by log level of Callouts. (Note: the recommended workaround did not solve the problem in our case.) [2]
This is the code that causes the error:
HttpRequest req = new HttpRequest(); req.setEndpoint('callout:AmazonConnectAPI/contact/start-recording'); req.setMethod('POST'); String body = String.format( ''{'"ContactId": "{0}","InitialContactId": "{1}","InstanceId": "{2}","VoiceRecordingConfiguration": '{'"VoiceRecordingTrack": "{3}"'}''}'', new List{ contactId, initialContactId, instanceId, voiceRecordingTrack } ); if (body != '') { req.setBody(body); } Http http = new Http(); HttpResponse resp = http.send(req); Other notable facts:
The HTTP callout is made to a Named Credential called AmazonConnectAPI
AmazonConnectAPI is configured for "https://connect.us-east-1.amazonaws.com“
The authentication method of the Named Credential is Named Principal with protocol "AWS Signature Version 4"
The authentication method uses the credentials for an IAM user with a full-access managed policy to Amazon Connect.
The formatting of the body is correct. There is no syntax error.
The error comes from this line HttpResponse resp = http.send(req);
I was having some issues with my Named Credential (Named Principal) AWS Signature Version 4 and found some resolutions for the below error: HttpResponse resp = http.send(req); System.UnexpectedException: Script-thrown exception
1. Named Credential Name
Double check your 'callout:Named_Credential' in Apex matches the Named Credential API 'Name'.No brainer, but it got me for a few hours.
2. URL Encoded Endpoint
Make sure to escape any URL reserved characters: https://developers.google.com/maps/documentation/urls/url-encoding.
String endpoint = 'callout:Named_Credential/contactId/start=2021-02-10Thh:mm:ss.msm-00:00';
Should probably be:
String endpoint = 'callout:Named_Credential/contactId/start=2021-02-10Thh:mm:ss.msm-00:00';
No brainer, but it got me for a few more hours.
3. Escaping Curly Braces in String.format()
I just ran this in Dev Console for your body and got the below:
System.debug((Map) JSON.deserializeUntyped(String.format( ''{'"ContactId": "{0}","InitialContactId": "{1}","InstanceId": "{2}","VoiceRecordingConfiguration": '{'"VoiceRecordingTrack": "{3}"'}''}'', new List{ 'contactId', 'initialContactId', 'instanceId', 'voiceRecordingTrack' } ))); 15:46:47:008 FATAL_ERROR System.JSONException: Unexpected character (''' (code 39)): was expecting comma to separate OBJECT entries at [line:1, column:171]
Changing the last few escaped curly braces from "{3}"'}''}'', to "{3}"'}'}', got me a correct string
System.debug((Map) JSON.deserializeUntyped(String.format( ''{'"ContactId": "{0}","InitialContactId": "{1}","InstanceId": "{2}","VoiceRecordingConfiguration": '{'"VoiceRecordingTrack": "{3}"'}'}', new List{ 'contactId', 'initialContactId', 'instanceId', 'voiceRecordingTrack' } ))); 15:40:31:006 USER_DEBUG [45]|DEBUG|{ContactId=contactId, InitialContactId=initialContactId, InstanceId=instanceId, VoiceRecordingConfiguration={VoiceRecordingTrack=voiceRecordingTrack}}