OAuth2 Using Database Derby cannot return to 'getAccessToken()' at AbstractTokenGranter.java:65

I created testing project using Spring Security OAuth2 with Derby ClientDriver Connection to OAuth2 table

running on GlassFish Server 4.1

I have already done debugging

Why cannot return to next process on 'getAccessToken()' AbstractTokenGranter.java:65 ?

then that process to stopped at ClientCredentialsTokenEndpointFilter.java:132.

get { "error": "server_error", "error_description": null }

I Hope Somebody can help me ...