Use @Transactional where appropriate

spring-boot-samples/spring-boot-sample-data-jpa/src/main/java/org/springframework/boot/sample/data/jpa/web/SampleController.java

@@ -19,6 +19,7 @@ package org.springframework.boot.sample.data.jpa.web;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.sample.data.jpa.service.CityService;
 import org.springframework.stereotype.Controller;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
 
@@ -30,6 +31,7 @@ public class SampleController {
 
 	@RequestMapping("/")
 	@ResponseBody
+    @Transactional(readOnly = true)
 	public String helloWorld() {
 		return this.cityService.getCity("Bath", "UK").getName();
 	}