OAM OAuth service throws "java.lang.ClassCastException: " while requesting for access token!

OAM OAuth service throws "java.lang.ClassCastException: " while requesting for access token!

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We are trying to integrate OAM with Google Home. We use Googles's oauth playground to validate the Oauth configuration.

While testing

Step 1: OAuth client calls OAM Oauth authorize end point with required parameters. After authentication OAM returns the Authorization code.

Step 2: When OAuth client tries to retrieve Refresh token by passing Authorization code, OAM is returning Json response

{

  "error_description": "java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long",

  "error": "server_error"

}

Error message seen in oam-server1.out log

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long