Issues with Generating Authorization code and User Token using Apache OAuth client 2.0 library in Java

Question

I trying to Automate the User Level Token Creation/Generation process (REST/Authorization Grant Code) using Apache OAuth Client 2.0 Library in Java. And below is the Code that a

Answer 1

I have used this authentication code method. I got this error while making the auth code

> location->[] 
[ERROR] 2018-10-12 14:16:59.414 [http-nio-8080-exec-3]
> [dispatcherServlet] - Servlet.service() for servlet
> [dispatcherServlet] in context with path [] threw exception [Request
> processing failed; nested exception is
> java.lang.ArrayIndexOutOfBoundsException: 0] with root cause
> java.lang.ArrayIndexOutOfBoundsException: 0