Class Mediator Error when receiving scope as null from the Endpoint Security Configurations Token URL

[Nishan-SE]

Description

"Error occurred in the mediation of the class mediator" when Oauth 2.0 protected backend token endpoint returns scope as null value.

Steps to Reproduce

• Start the API Manager and go to the publisher portal.

• Create an API by specifying the backend protected endpoint then navigate to the Endpoint Security Configuration using Oauth 2.0 and select the grant type as Client Credentials or Resource Owner Password with specifying the Token URL, Client ID and Client Secret.

• Save and deploy the API.

If the specified backend token url return the scope as null as below:

{
"access_token": "xxxxxxxxx",
"refresh_token": "xxxxxxxxx",
"token_type": "xxxxxx",
"scope": null,
"expires_in": xxxxx
}

Then the below exception will get triggered -

Error occurred in the mediation of the class mediator.

Affected Component

APIM

Version

4.2.0

Environment Details (with versions)

No response

Relevant Log Output

No response

Related Issues

No response

Suggested Labels

No response

[hisanhunais]

Fix done via wso2/carbon-apimgt#12701