Bump up spring boot version to 2.2.1

Author: callicoder

polling-app-server/pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.1.6.RELEASE</version>
+		<version>2.2.1.RELEASE</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 

polling-app-server/src/main/java/com/example/polls/service/PollService.java

@@ -124,7 +124,7 @@ public PagedResponse<PollResponse> getPollsVotedBy(String username, UserPrincipa
         // Retrieve all poll details from the voted pollIds.
         List<Long> pollIds = userVotedPollIds.getContent();
 
-        Sort sort = new Sort(Sort.Direction.DESC, "createdAt");
+        Sort sort = Sort.by(Sort.Direction.DESC, "createdAt");
         List<Poll> polls = pollRepository.findByIdIn(pollIds, sort);
 
         // Map Polls to PollResponses containing vote counts and poll creator details