Implementing OAuth 2: validation issue

Hi all,

I try to validate accesstoken from the following example (ATeam):

http://www.ateam-oracle.com/implementing-oauth-2-with-oracle-access-manager-oauth-services-part-ii/

if I send Simple Validation request:

curl -i -H ‘Authorization: Basic YnVzaW5lc3NDbGllbnQ6M1dGTHVkVEZ5Qms=’ –request POST http://oxygen.mycompany.com:14100/ms_oauth/oauth2/endpoints/oauthservice/tokens -d ‘grant_type=oracle-idm%3A%2Foauth%2Fgrant-type%2Fresource-access-token%2Fjwt&oracle_token_action=validate&scope=UserProfile.me&assertion=$AccessToken from step 1’

get the following error, is there any solution and/or doc about this issue available?

<Error> <oracle.idaas.oauth.token> <BEA-000000> <null

java.lang.NullPointerException

        at sun.security.provider.JavaKeyStore$JKS.convertAlias(JavaKeyStore.java:57)