New dependency is required for validation annotations to work.

pom.xml

@@ -33,6 +33,10 @@
             <artifactId>javax.inject</artifactId>
             <version>1</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
         <dependency>
             <groupId>javax.validation</groupId>
             <artifactId>validation-api</artifactId>