Polish

spring-boot-samples/spring-boot-sample-tomcat/src/main/java/sample/tomcat/web/SampleController.java

@@ -20,8 +20,10 @@ import sample.tomcat.service.HelloWorldService;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.ModelAndView;
 
 @Controller
 public class SampleController {
@@ -32,7 +34,12 @@ public class SampleController {
 	@GetMapping("/")
 	@ResponseBody
 	public String helloWorld() {
-		return this.helloWorldService.getHelloMessage();
+		throw new RuntimeException("Fail");
+	}
+
+	@ExceptionHandler(RuntimeException.class)
+	public ModelAndView handle(RuntimeException ex) {
+		return null;
 	}
 
 }