lookup parent from repository

whatsmars-spring-boot/pom.xml

@@ -23,6 +23,7 @@
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
     <dependencies>