[CI] add check formater valadator

.gitlab-ci.yml

@@ -25,6 +25,7 @@ style_job:
   stage: style
   script:
     - mvn $MAVEN_CLI_OPTS checkstyle:checkstyle
+    - mvn $MAVEN_CLI_OPTS formatter:validate
 
 build_job:
   stage: build

pom.xml

@@ -116,14 +116,21 @@
 				<configuration>
 					<encoding>UTF-8</encoding>
 					<configFile>Formatter.xml</configFile>
+					<directories>
+						<directory>src/</directory>
+						<directory>test/src</directory>
+					</directories>
+					<includes>
+						<include>**/*.java</include>
+					</includes>
 				</configuration>
-<!-- 				<executions> -->
-<!-- 					<execution> -->
-<!-- 						<goals> -->
-<!-- 							<goal>validate</goal> -->
-<!-- 						</goals> -->
-<!-- 					</execution> -->
-<!-- 				</executions> -->
+				<executions>
+					<execution>
+						<goals>
+							<goal>validate</goal>
+						</goals>
+					</execution>
+				</executions>
 			</plugin>
 		</plugins>
 	</build>