Add @EnableOAuth2Sso and spring.oauth2.sso.*

User can enable OAuth2 SSO by declaring the intent (@EnableOAuth2Sso)
and also configuring the client properties (spring.oauth2.client.*).
The spring.oauth2.sso.* are only needed to change the path for the
login (defaults to /login) - any other security configuration for the
protected resources can be added in a WebSecurityConfigurerAdapter
which carries the @EnableOAuth2Sso annotation.

spring-boot-cli/samples/oauth2.groovy

@@ -2,11 +2,9 @@ package org.test
 
 @EnableAuthorizationServer
 @EnableResourceServer
-@EnableGlobalMethodSecurity(prePostEnabled = true)
 @RestController
 class SampleController {
 
-	@PreAuthorize("#oauth2.hasScope('read')")
 	@RequestMapping("/")
 	def hello() {
 		[message: "Hello World!"]