From 5aca6f4a7d087e4acd9423a44fab63f8852cc6a3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A1rton=20Balassi?= <mbalassi@apache.org>
Date: Tue, 1 Mar 2016 21:42:40 +0100
Subject: [PATCH] [build] Consolidate scala checkstyle usage and update version
 to 0.8.0

Consolidation is done via plugin management.

Closes #1753
---
 flink-batch-connectors/flink-hcatalog/pom.xml | 17 +---------
 flink-contrib/flink-streaming-contrib/pom.xml | 17 +---------
 flink-examples/flink-examples-batch/pom.xml   | 21 ++-----------
 .../flink-examples-streaming/pom.xml          | 18 +----------
 flink-libraries/flink-gelly-examples/pom.xml  | 17 +---------
 flink-libraries/flink-gelly-scala/pom.xml     | 31 +++++--------------
 flink-libraries/flink-ml/pom.xml              | 17 +---------
 flink-libraries/flink-table/pom.xml           | 17 +---------
 flink-runtime/pom.xml                         | 17 +---------
 flink-scala-shell/pom.xml                     | 17 +---------
 flink-scala/pom.xml                           | 17 +---------
 flink-streaming-scala/pom.xml                 | 17 +---------
 flink-test-utils/pom.xml                      | 17 +---------
 flink-tests/pom.xml                           | 19 ++----------
 flink-yarn-tests/pom.xml                      | 17 +---------
 flink-yarn/pom.xml                            | 17 +---------
 pom.xml                                       | 28 +++++++++++++++--
 17 files changed, 51 insertions(+), 270 deletions(-)

diff --git a/flink-batch-connectors/flink-hcatalog/pom.xml b/flink-batch-connectors/flink-hcatalog/pom.xml
index b0394da1e4a..f79431d1ab3 100644
--- a/flink-batch-connectors/flink-hcatalog/pom.xml
+++ b/flink-batch-connectors/flink-hcatalog/pom.xml
@@ -150,27 +150,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-contrib/flink-streaming-contrib/pom.xml b/flink-contrib/flink-streaming-contrib/pom.xml
index 4da88386e73..c85635f093e 100644
--- a/flink-contrib/flink-streaming-contrib/pom.xml
+++ b/flink-contrib/flink-streaming-contrib/pom.xml
@@ -191,27 +191,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/flink-examples/flink-examples-batch/pom.xml b/flink-examples/flink-examples-batch/pom.xml
index 67b4f309afc..08923ea6211 100644
--- a/flink-examples/flink-examples-batch/pom.xml
+++ b/flink-examples/flink-examples-batch/pom.xml
@@ -138,33 +138,16 @@ under the License.
 				</executions>
 			</plugin>
 
-			<!-- Scala Code Style -->
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 			
-			<!-- create the exampe JAR files -->
-			
+			<!-- create the example JAR files -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-jar-plugin</artifactId>
diff --git a/flink-examples/flink-examples-streaming/pom.xml b/flink-examples/flink-examples-streaming/pom.xml
index d5166354a9e..79403c89c83 100644
--- a/flink-examples/flink-examples-streaming/pom.xml
+++ b/flink-examples/flink-examples-streaming/pom.xml
@@ -85,28 +85,12 @@ under the License.
 	<build>
 		<plugins>
 
-			<!-- Scala Code Style -->
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 			
diff --git a/flink-libraries/flink-gelly-examples/pom.xml b/flink-libraries/flink-gelly-examples/pom.xml
index ab7eacc911c..5ed0fa4157c 100644
--- a/flink-libraries/flink-gelly-examples/pom.xml
+++ b/flink-libraries/flink-gelly-examples/pom.xml
@@ -177,27 +177,12 @@
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/flink-libraries/flink-gelly-scala/pom.xml b/flink-libraries/flink-gelly-scala/pom.xml
index 2a8ca6df744..cbcdac13254 100644
--- a/flink-libraries/flink-gelly-scala/pom.xml
+++ b/flink-libraries/flink-gelly-scala/pom.xml
@@ -185,29 +185,14 @@ under the License.
                 </executions>
             </plugin>
 
-            <plugin>
-                <groupId>org.scalastyle</groupId>
-                <artifactId>scalastyle-maven-plugin</artifactId>
-                <version>0.5.0</version>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>check</goal>
-                        </goals>
-                    </execution>
-                </executions>
-                <configuration>
-                    <verbose>false</verbose>
-                    <failOnViolation>true</failOnViolation>
-                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
-                    <failOnWarning>false</failOnWarning>
-                    <sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-                    <testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
-                    <configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-                    <outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-                    <outputEncoding>UTF-8</outputEncoding>
-                </configuration>
-            </plugin>
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
+			<plugin>
+				<groupId>org.scalastyle</groupId>
+				<artifactId>scalastyle-maven-plugin</artifactId>
+				<configuration>
+					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
+				</configuration>
+			</plugin>
         </plugins>
     </build>
 
diff --git a/flink-libraries/flink-ml/pom.xml b/flink-libraries/flink-ml/pom.xml
index 2a26e515927..986cb0f5640 100644
--- a/flink-libraries/flink-ml/pom.xml
+++ b/flink-libraries/flink-ml/pom.xml
@@ -160,27 +160,12 @@
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/flink-libraries/flink-table/pom.xml b/flink-libraries/flink-table/pom.xml
index 2c278cdb870..2d56ec961b7 100644
--- a/flink-libraries/flink-table/pom.xml
+++ b/flink-libraries/flink-table/pom.xml
@@ -217,27 +217,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-runtime/pom.xml b/flink-runtime/pom.xml
index e77dfc60d79..7fa967ec53e 100644
--- a/flink-runtime/pom.xml
+++ b/flink-runtime/pom.xml
@@ -289,27 +289,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-scala-shell/pom.xml b/flink-scala-shell/pom.xml
index faea2065476..d75c62654b1 100644
--- a/flink-scala-shell/pom.xml
+++ b/flink-scala-shell/pom.xml
@@ -195,27 +195,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-scala/pom.xml b/flink-scala/pom.xml
index e19c3db49bd..9dc15b46ec1 100644
--- a/flink-scala/pom.xml
+++ b/flink-scala/pom.xml
@@ -202,27 +202,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-streaming-scala/pom.xml b/flink-streaming-scala/pom.xml
index 81918701692..4310852526c 100644
--- a/flink-streaming-scala/pom.xml
+++ b/flink-streaming-scala/pom.xml
@@ -207,27 +207,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/flink-test-utils/pom.xml b/flink-test-utils/pom.xml
index 3dc298d8bfc..5891b17503d 100644
--- a/flink-test-utils/pom.xml
+++ b/flink-test-utils/pom.xml
@@ -198,27 +198,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-tests/pom.xml b/flink-tests/pom.xml
index b0b70b9e690..34b3d668edb 100644
--- a/flink-tests/pom.xml
+++ b/flink-tests/pom.xml
@@ -292,28 +292,13 @@ under the License.
 					</execution>
 				</executions>
 			</plugin>
-			
+
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		
diff --git a/flink-yarn-tests/pom.xml b/flink-yarn-tests/pom.xml
index f01ca3be222..1d0951d476b 100644
--- a/flink-yarn-tests/pom.xml
+++ b/flink-yarn-tests/pom.xml
@@ -278,27 +278,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 
diff --git a/flink-yarn/pom.xml b/flink-yarn/pom.xml
index 43b78675eea..63869ee48a0 100644
--- a/flink-yarn/pom.xml
+++ b/flink-yarn/pom.xml
@@ -188,27 +188,12 @@ under the License.
 				</executions>
 			</plugin>
 
+			<!-- Scala Code Style, most of the configuration done via plugin management -->
 			<plugin>
 				<groupId>org.scalastyle</groupId>
 				<artifactId>scalastyle-maven-plugin</artifactId>
-				<version>0.5.0</version>
-				<executions>
-					<execution>
-						<goals>
-							<goal>check</goal>
-						</goals>
-					</execution>
-				</executions>
 				<configuration>
-					<verbose>false</verbose>
-					<failOnViolation>true</failOnViolation>
-					<includeTestSourceDirectory>true</includeTestSourceDirectory>
-					<failOnWarning>false</failOnWarning>
-					<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
-					<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
 					<configLocation>${project.basedir}/../tools/maven/scalastyle-config.xml</configLocation>
-					<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>
-					<outputEncoding>UTF-8</outputEncoding>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/pom.xml b/pom.xml
index 9e3e8c7cb9c..ace4ec6a61f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -813,7 +813,7 @@ under the License.
 						<exclude>flink-runtime-web/web-dashboard/assets/fonts/FontAwesome.otf</exclude>
 						<exclude>flink-runtime-web/web-dashboard/assets/fonts/fontawesome*</exclude>
 
-                        <!-- generated contents -->
+						<!-- generated contents -->
 						<exclude>flink-runtime-web/web-dashboard/web/**</exclude>
 
 						<!-- downloaded and generated web libraries. -->
@@ -836,7 +836,7 @@ under the License.
 						<exclude>**/flink-bin/conf/slaves</exclude>
 						<exclude>**/flink-bin/conf/masters</exclude>
 						<exclude>**/flink-bin/conf/zoo.cfg</exclude>
-                        <exclude>flink-contrib/docker-flink/flink/conf/slaves</exclude>
+						<exclude>flink-contrib/docker-flink/flink/conf/slaves</exclude>
 						<!-- Administrative files in the main trunk. -->
 						<exclude>**/README.md</exclude>
 						<exclude>CHANGELOG</exclude>
@@ -1117,6 +1117,30 @@ under the License.
 						</lifecycleMappingMetadata>
 					</configuration>
 				</plugin>
+
+				<!-- configure scala style -->
+				<plugin>
+					<groupId>org.scalastyle</groupId>
+					<artifactId>scalastyle-maven-plugin</artifactId>
+					<version>0.5.0</version>
+					<executions>
+						<execution>
+							<goals>
+								<goal>check</goal>
+							</goals>
+						</execution>
+					</executions>
+					<configuration>
+						<verbose>false</verbose>
+						<failOnViolation>true</failOnViolation>
+						<includeTestSourceDirectory>true</includeTestSourceDirectory>
+						<failOnWarning>false</failOnWarning>
+						<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
+						<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
+						<outputFile>${project.basedir}/target/scalastyle-output.xml</outputFile>
+						<outputEncoding>UTF-8</outputEncoding>
+					</configuration>
+				</plugin>
 			</plugins>
 		</pluginManagement>
 	</build>
-- 
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