how to debug apim-km-extension

[polyaha]

Description: I'm trying to debug this apim-km-extension but i don't know how.

The need start from testing the folowing scenario :

• frontend call keycloak for access token (after validating the login)
• apim validate the token and proceed to backend
• backend respond

by far,

• i made keycloak as key manager in http://locahost:9443/admin
• Create the api + attach the key manager
• create the application in http://localhost:9443/devportal + subscribe to the api

After testing from curl/postman/myApp, i always got the error 900900.

In order to check that everything is fine, i extract the token send to apim and make a manuel introspection that return that the token is valid

Please let's me know how to debug this extension to undestand the issue.

FYI: i already build carbon-apim with IntellJ and make it in debug mode but each time it reach getTokenMetadata i cant find source.