CAS 6.4 REST Authentication to External Service - Missing type id property '@class'-CodePudding

I am trying to replace MongoAuthentication (cas-server-support-mongo) with RestAuthentication (cas-server-support-rest-authentication). Here are what I achieved so far:

Be able to ask CAS call to my external REST URI to authenticate the user.
My REST URI is also be able to return data as CAS required. Here is the log I got. It seems to be OK at this step.

[36m2021-12-18 00:19:18,155 DEBUG [org.apereo.cas.adaptors.rest.RestAuthenticationHandler] 
- <REST authentication response received
[{"_class":"org.apereo.cas.authentication.principal.SimplePrincipal","id":"[email protected]","attributes":{}}]>

Here is the error CAS threw

ERROR [org.apereo.cas.adaptors.rest.RestAuthenticationHandler] 
- <Could not resolve subtype of [simple type, class org.apereo.cas.authentication.principal.Principal]: 
missing type id property '@class'

I am pretty sure that my REST response has id

return {
    '@class': "org.apereo.cas.authentication.principal.SimplePrincipal",
    'id': '[email protected]',
    'attributes': {}
}

I tried all @class or _class. Both of them didn't work at all.

Finally. Cas said

Unable to detect the authentication principal for [email protected]

Could you please kindly advise what I forgot?

THanks, Quang

CodePudding user response：

I don't understand java, i have the same question, i just use the error log and read the document to try, maybe the json can help you

{
"@class": "org.apereo.cas.authentication.principal.SimplePrincipal",
"id": "abc",
"attributes": {
    "@class": "java.util.LinkedHashMap",
    "username": [
        "java.util.List",
        ["jackson"]
    ]
 }
}