Fix broken Rest Template.

src/main/java/com/gmu/bookshare/BookshareApplication.java

@@ -19,6 +19,7 @@ import org.springframework.security.core.authority.AuthorityUtils;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.web.authentication.logout.LogoutFilter;
 import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
+import org.springframework.web.client.RestTemplate;
 import org.springframework.web.filter.ForwardedHeaderFilter;
 
 import javax.servlet.http.HttpSessionEvent;
@@ -36,8 +37,13 @@ public class BookshareApplication {
     }
 
     @Bean
-    FilterRegistrationBean forwardedHeaderFilter() {
-        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+
+    @Bean
+    FilterRegistrationBean<ForwardedHeaderFilter> forwardedHeaderFilter() {
+        FilterRegistrationBean<ForwardedHeaderFilter> filterRegistrationBean = new FilterRegistrationBean<>();
         filterRegistrationBean.setFilter(new ForwardedHeaderFilter());
         filterRegistrationBean.setOrder(Ordered.HIGHEST_PRECEDENCE);
         return filterRegistrationBean;