diff --git a/.gitignore b/.gitignore
index b8291a0..cc6e619 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,4 +38,6 @@ target/
 test-output
 
 # local test
-pard-server-test/
+pard-main/etc/distribute.sh
+pard-main/etc/pid
+pard-main/etc/test.sql
diff --git a/pard-assembly/pom.xml b/pard-assembly/pom.xml
index d1893e9..117bdeb 100644
--- a/pard-assembly/pom.xml
+++ b/pard-assembly/pom.xml
@@ -14,4 +14,27 @@
     <properties>
         <main.basedir>${project.parent.basedir}</main.basedir>
     </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <descriptors>
+                        <descriptor>src/main/assembly/pard-final.xml</descriptor>
+                    </descriptors>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>
\ No newline at end of file
diff --git a/pard-assembly/src/main/assembly/pard-final.xml b/pard-assembly/src/main/assembly/pard-final.xml
index 19194d9..52ef244 100644
--- a/pard-assembly/src/main/assembly/pard-final.xml
+++ b/pard-assembly/src/main/assembly/pard-final.xml
@@ -3,15 +3,40 @@
     <id>final</id>
     <formats>
         <format>tar.gz</format>
+        <format>zip</format>
         <format>dir</format>
     </formats>
     <includeBaseDirectory>true</includeBaseDirectory>
+    <baseDirectory>pard-1.0-snapshot</baseDirectory>
     <fileSets>
         <fileSet>
-            <directory>${project.basedir}/../pard-server-test</directory>
-            <outputDirectory>/bin</outputDirectory>
+            <directory>${project.basedir}/../pard-main/etc/sbin</directory>
+            <outputDirectory>sbin</outputDirectory>
             <fileMode>0755</fileMode>
             <directoryMode>0755</directoryMode>
         </fileSet>
+        <fileSet>
+            <directory>${project.basedir}/../pard-main/src/main/resources/webapp</directory>
+            <outputDirectory>webapp</outputDirectory>
+        </fileSet>
     </fileSets>
+
+    <files>
+        <file>
+            <source>${project.basedir}/../pard-main/target/pard-server.jar</source>
+            <outputDirectory>bin</outputDirectory>
+        </file>
+        <file>
+            <source>${project.basedir}/../pard-client/target/pard-client.jar</source>
+            <outputDirectory>bin</outputDirectory>
+        </file>
+        <file>
+            <source>${project.basedir}/../pard-main/etc/pard.properties</source>
+            <outputDirectory></outputDirectory>
+        </file>
+        <file>
+            <source>${project.basedir}/../pard-main/etc/jvm.properties</source>
+            <outputDirectory></outputDirectory>
+        </file>
+    </files>
 </assembly>
\ No newline at end of file
diff --git a/pard-client/pom.xml b/pard-client/pom.xml
index 66c56d8..033aa52 100644
--- a/pard-client/pom.xml
+++ b/pard-client/pom.xml
@@ -52,7 +52,6 @@
                                     <mainClass>cn.edu.ruc.iir.pard.client.PardClient</mainClass>
                                 </transformer>
                             </transformers>
-                            <outputDirectory>${main.basedir}/pard-server-test/</outputDirectory>
                         </configuration>
                     </execution>
                 </executions>
diff --git a/pard-main/etc/connector/mysql.properties b/pard-main/etc/connector/mysql.properties
deleted file mode 100644
index e69de29..0000000
diff --git a/pard-main/etc/connector/postgres.properties b/pard-main/etc/connector/postgres.properties
deleted file mode 100644
index e69de29..0000000
diff --git a/pard-main/etc/sbin/pard-client b/pard-main/etc/sbin/pard-client
new file mode 100755
index 0000000..773dd19
--- /dev/null
+++ b/pard-main/etc/sbin/pard-client
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ $# != 2 ] ; then
+    echo "pard-client <host> <port>"
+    exit
+fi
+
+cd `dirname $0`
+
+exec java -jar ../bin/pard-client.jar $1 $2
diff --git a/pard-main/etc/sbin/pard-server b/pard-main/etc/sbin/pard-server
new file mode 100755
index 0000000..10aa381
--- /dev/null
+++ b/pard-main/etc/sbin/pard-server
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+if [ $# != 1 ] ; then
+    echo "pard-server <run/start/stop>"
+    exit
+fi
+
+cd `dirname $0`
+
+# run in foreground
+if [ $1 == "run" ] ; then
+    if [ -e ../pid ] ; then
+        echo "Pard already started. Please stop it first."
+    else
+        exec java -jar ../bin/pard-server.jar ../pard.properties
+    fi
+    exit
+fi
+
+# run in background
+if [ $1 == "start" ] ; then
+    if [ -e ../pid ] ; then
+        echo "Pard already started. Please stop it first."
+    else
+        nohup java -jar ../bin/pard-server.jar ../pard.properties &
+        pid=$!
+        echo ${pid} > ../pid
+        echo "Pard is running in background as" ${pid}
+    fi
+    exit
+fi
+
+# stop
+if [ $1 == "stop" ]
+then
+    if [ -e ../pid ] && [ -r ../pid ] ; then
+        # read pid
+        pid=$(head -n 1 ../pid)
+        # kill process
+        kill -9 ${pid}
+        # remove file
+        rm ../pid
+        echo "Pard at" ${pid} "is killed."
+    else
+        echo "Pard is not started yet."
+    fi
+    exit
+fi
+
+echo "pard-server <run/start/stop>"
+exit
\ No newline at end of file
diff --git a/pard-main/pom.xml b/pard-main/pom.xml
index 58f68c6..2de0f7f 100644
--- a/pard-main/pom.xml
+++ b/pard-main/pom.xml
@@ -1,119 +1,118 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<parent>
-		<artifactId>pard</artifactId>
-		<groupId>cn.edu.ruc.iir</groupId>
-		<version>1.0-SNAPSHOT</version>
-	</parent>
-	<modelVersion>4.0.0</modelVersion>
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>pard</artifactId>
+        <groupId>cn.edu.ruc.iir</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
 
-	<artifactId>pard-main</artifactId>
+    <artifactId>pard-main</artifactId>
 
-	<properties>
-		<main.basedir>${project.parent.basedir}</main.basedir>
-	</properties>
+    <properties>
+        <main.basedir>${project.parent.basedir}</main.basedir>
+    </properties>
 
-	<dependencies>
-		<!-- pard -->
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-commons</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-communication</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-parser</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-catalog</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-connector-postgresql</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-nodekeeper</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>cn.edu.ruc.iir</groupId>
-			<artifactId>pard-optimizer</artifactId>
-		</dependency>
-		<!-- grpc -->
-		<dependency>
-			<groupId>io.grpc</groupId>
-			<artifactId>grpc-netty</artifactId>
-		</dependency>
-		<!-- marshalling -->
-		<dependency>
-			<groupId>org.jboss.marshalling</groupId>
-			<artifactId>jboss-marshalling-serial</artifactId>
-		</dependency>
+    <dependencies>
+        <!-- pard -->
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-commons</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-communication</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-parser</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-catalog</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-connector-postgresql</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-nodekeeper</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>cn.edu.ruc.iir</groupId>
+            <artifactId>pard-optimizer</artifactId>
+        </dependency>
+        <!-- grpc -->
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-netty</artifactId>
+        </dependency>
+        <!-- marshalling -->
+        <dependency>
+            <groupId>org.jboss.marshalling</groupId>
+            <artifactId>jboss-marshalling-serial</artifactId>
+        </dependency>
 
-		<dependency>
-			<groupId>org.testng</groupId>
-			<artifactId>testng</artifactId>
-			<scope>test</scope>
-		</dependency>
-		<!-- jetty -->
-		<dependency>
-			<groupId>org.eclipse.jetty.aggregate</groupId>
-			<artifactId>jetty-all</artifactId>
-			<version>9.2.14.v20151106</version>
-		</dependency>
-		<dependency>
-			<groupId>javax.servlet</groupId>
-			<artifactId>javax.servlet-api</artifactId>
-			<version>3.1.0</version>
-		</dependency>
-		<dependency>
-			<groupId>org.eclipse.jetty</groupId>
-			<artifactId>jetty-jsp</artifactId>
-			<version>9.2.15.v20160210</version>
-		</dependency>
-	</dependencies>
+        <dependency>
+            <groupId>org.testng</groupId>
+            <artifactId>testng</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <!-- jetty -->
+        <dependency>
+            <groupId>org.eclipse.jetty.aggregate</groupId>
+            <artifactId>jetty-all</artifactId>
+            <version>9.2.14.v20151106</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>3.1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.jetty</groupId>
+            <artifactId>jetty-jsp</artifactId>
+            <version>9.2.15.v20160210</version>
+        </dependency>
+    </dependencies>
 
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-shade-plugin</artifactId>
-				<executions>
-					<execution>
-						<phase>package</phase>
-						<goals>
-							<goal>shade</goal>
-						</goals>
-						<configuration>
-							<finalName>pard-server</finalName>
-							<shadedArtifactAttached>true</shadedArtifactAttached>
-							<shadedClassifierName>allinone</shadedClassifierName>
-							<filters>
-								<filter>
-									<artifact>*:*</artifact>
-									<excludes>
-										<exclude>META-INF/*.SF</exclude>
-										<exclude>META-INT/*.DSA</exclude>
-										<exclude>META-INT/*.RSA</exclude>
-									</excludes>
-								</filter>
-							</filters>
-							<transformers>
-								<transformer
-									implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-									<mainClass>cn.edu.ruc.iir.pard.server.PardServer</mainClass>
-								</transformer>
-							</transformers>
-							<outputDirectory>${main.basedir}/pard-server-test/</outputDirectory>
-						</configuration>
-					</execution>
-				</executions>
-			</plugin>
-		</plugins>
-	</build>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <finalName>pard-server</finalName>
+                            <shadedArtifactAttached>true</shadedArtifactAttached>
+                            <shadedClassifierName>allinone</shadedClassifierName>
+                            <filters>
+                                <filter>
+                                    <artifact>*:*</artifact>
+                                    <excludes>
+                                        <exclude>META-INF/*.SF</exclude>
+                                        <exclude>META-INT/*.DSA</exclude>
+                                        <exclude>META-INT/*.RSA</exclude>
+                                    </excludes>
+                                </filter>
+                            </filters>
+                            <transformers>
+                                <transformer
+                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>cn.edu.ruc.iir.pard.server.PardServer</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>
diff --git a/pom.xml b/pom.xml
index d6adc61..75f6d8b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,38 +1,38 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
 
-	<groupId>cn.edu.ruc.iir</groupId>
-	<artifactId>pard</artifactId>
-	<packaging>pom</packaging>
-	<version>1.0-SNAPSHOT</version>
-	<modules>
-		<module>pard-assembly</module>
-		<module>pard-parser</module>
-		<module>pard-connector</module>
-		<module>pard-catalog</module>
-		<module>pard-connector-mysql</module>
-		<module>pard-connector-postgresql</module>
-		<module>pard-nodekeeper</module>
-		<module>pard-main</module>
-		<module>pard-communication</module>
-		<module>pard-optimizer</module>
-		<module>pard-executor</module>
-		<module>pard-commons</module>
-		<module>pard-client</module>
-	</modules>
+    <groupId>cn.edu.ruc.iir</groupId>
+    <artifactId>pard</artifactId>
+    <packaging>pom</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <modules>
+        <module>pard-assembly</module>
+        <module>pard-parser</module>
+        <module>pard-connector</module>
+        <module>pard-catalog</module>
+        <module>pard-connector-mysql</module>
+        <module>pard-connector-postgresql</module>
+        <module>pard-nodekeeper</module>
+        <module>pard-main</module>
+        <module>pard-communication</module>
+        <module>pard-optimizer</module>
+        <module>pard-executor</module>
+        <module>pard-commons</module>
+        <module>pard-client</module>
+    </modules>
 
-	<properties>
-		<antlr.version>4.6</antlr.version>
-		<check-style.skip>false</check-style.skip>
-		<check-style.failOnViolation>true</check-style.failOnViolation>
-		<main.basedir>${project.basedir}</main.basedir>
-		<javax-inject.version>1</javax-inject.version>
-		<javax-validation.version>1.1.0.Final</javax-validation.version>
-		<guava.version>21.0</guava.version>
-		<checkstyle.config.location>${main.basedir}/src/checkstyle/checks.xml</checkstyle.config.location>
-	</properties>
+    <properties>
+        <antlr.version>4.6</antlr.version>
+        <check-style.skip>false</check-style.skip>
+        <check-style.failOnViolation>true</check-style.failOnViolation>
+        <main.basedir>${project.basedir}</main.basedir>
+        <javax-inject.version>1</javax-inject.version>
+        <javax-validation.version>1.1.0.Final</javax-validation.version>
+        <guava.version>21.0</guava.version>
+        <checkstyle.config.location>${main.basedir}/src/checkstyle/checks.xml</checkstyle.config.location>
+    </properties>
 
     <dependencyManagement>
         <dependencies>
@@ -93,181 +93,187 @@
                 <version>1.0-SNAPSHOT</version>
             </dependency>
 
-			<!-- Antlr -->
-			<dependency>
-				<groupId>org.antlr</groupId>
-				<artifactId>antlr4-runtime</artifactId>
-				<version>${antlr.version}</version>
-			</dependency>
+            <!-- Antlr -->
+            <dependency>
+                <groupId>org.antlr</groupId>
+                <artifactId>antlr4-runtime</artifactId>
+                <version>${antlr.version}</version>
+            </dependency>
 
-			<!-- Java APIs -->
-			<dependency>
-				<groupId>javax.inject</groupId>
-				<artifactId>javax.inject</artifactId>
-				<version>${javax-inject.version}</version>
-			</dependency>
-			<dependency>
-				<groupId>javax.validation</groupId>
-				<artifactId>validation-api</artifactId>
-				<version>${javax-validation.version}</version>
-			</dependency>
+            <!-- Java APIs -->
+            <dependency>
+                <groupId>javax.inject</groupId>
+                <artifactId>javax.inject</artifactId>
+                <version>${javax-inject.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>javax.validation</groupId>
+                <artifactId>validation-api</artifactId>
+                <version>${javax-validation.version}</version>
+            </dependency>
 
-			<!-- JSR-305 -->
-			<dependency>
-				<groupId>com.google.code.findbugs</groupId>
-				<artifactId>jsr305</artifactId>
-				<version>3.0.2</version>
-			</dependency>
+            <!-- JSR-305 -->
+            <dependency>
+                <groupId>com.google.code.findbugs</groupId>
+                <artifactId>jsr305</artifactId>
+                <version>3.0.2</version>
+            </dependency>
 
-			<!-- guava -->
-			<dependency>
-				<groupId>com.google.guava</groupId>
-				<artifactId>guava</artifactId>
-				<version>${guava.version}</version>
-			</dependency>
+            <!-- guava -->
+            <dependency>
+                <groupId>com.google.guava</groupId>
+                <artifactId>guava</artifactId>
+                <version>${guava.version}</version>
+            </dependency>
 
-			<dependency>
-				<groupId>com.zaxxer</groupId>
-				<artifactId>HikariCP</artifactId>
-				<version>2.6.2</version>
-			</dependency>
+            <dependency>
+                <groupId>com.zaxxer</groupId>
+                <artifactId>HikariCP</artifactId>
+                <version>2.6.2</version>
+            </dependency>
 
-			<!-- gRPC -->
-			<dependency>
-				<groupId>io.grpc</groupId>
-				<artifactId>grpc-netty</artifactId>
-				<version>1.4.0</version>
-			</dependency>
-			<dependency>
-				<groupId>io.grpc</groupId>
-				<artifactId>grpc-protobuf</artifactId>
-				<version>1.4.0</version>
-			</dependency>
-			<dependency>
-				<groupId>io.grpc</groupId>
-				<artifactId>grpc-stub</artifactId>
-				<version>1.4.0</version>
-			</dependency>
+            <!-- gRPC -->
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-netty</artifactId>
+                <version>1.4.0</version>
+            </dependency>
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-protobuf</artifactId>
+                <version>1.4.0</version>
+            </dependency>
+            <dependency>
+                <groupId>io.grpc</groupId>
+                <artifactId>grpc-stub</artifactId>
+                <version>1.4.0</version>
+            </dependency>
 
-			<dependency>
-				<groupId>io.netty</groupId>
-				<artifactId>netty-all</artifactId>
-				<version>4.1.8.Final</version>
-				<scope>compile</scope>
-			</dependency>
+            <dependency>
+                <groupId>io.netty</groupId>
+                <artifactId>netty-all</artifactId>
+                <version>4.1.8.Final</version>
+                <scope>compile</scope>
+            </dependency>
 
-			<dependency>
-				<groupId>org.postgresql</groupId>
-				<artifactId>postgresql</artifactId>
-				<version>9.4.1212.jre7</version>
-			</dependency>
+            <dependency>
+                <groupId>org.postgresql</groupId>
+                <artifactId>postgresql</artifactId>
+                <version>9.4.1212.jre7</version>
+            </dependency>
 
-			<!-- pard log4j -->
-			<dependency>
-				<groupId>org.slf4j</groupId>
-				<artifactId>slf4j-api</artifactId>
-				<version>1.6.6</version>
-			</dependency>
-			<dependency>
-				<groupId>org.slf4j</groupId>
-				<artifactId>slf4j-log4j12</artifactId>
-				<version>1.6.6</version>
-			</dependency>
-			<dependency>
-				<groupId>log4j</groupId>
-				<artifactId>log4j</artifactId>
-				<version>1.2.16</version>
-			</dependency>
+            <!-- pard log4j -->
+            <dependency>
+                <groupId>org.slf4j</groupId>
+                <artifactId>slf4j-api</artifactId>
+                <version>1.6.6</version>
+            </dependency>
+            <dependency>
+                <groupId>org.slf4j</groupId>
+                <artifactId>slf4j-log4j12</artifactId>
+                <version>1.6.6</version>
+            </dependency>
+            <dependency>
+                <groupId>log4j</groupId>
+                <artifactId>log4j</artifactId>
+                <version>1.2.16</version>
+            </dependency>
 
-			<!-- jboss marshalling -->
-			<dependency>
-				<groupId>org.jboss.marshalling</groupId>
-				<artifactId>jboss-marshalling-serial</artifactId>
+            <!-- jboss marshalling -->
+            <dependency>
+                <groupId>org.jboss.marshalling</groupId>
+                <artifactId>jboss-marshalling-serial</artifactId>
                 <version>2.0.0.Final</version>
-			</dependency>
+            </dependency>
 
-			<!-- unit tests -->
-			<dependency>
-				<groupId>org.testng</groupId>
-				<artifactId>testng</artifactId>
-				<version>6.10</version>
-				<exclusions>
-					<exclusion>
-						<groupId>junit</groupId>
-						<artifactId>junit</artifactId>
-					</exclusion>
-					<exclusion>
-						<groupId>com.google.inject</groupId>
-						<artifactId>guice</artifactId>
-					</exclusion>
-				</exclusions>
-			</dependency>
+            <!-- unit tests -->
+            <dependency>
+                <groupId>org.testng</groupId>
+                <artifactId>testng</artifactId>
+                <version>6.10</version>
+                <exclusions>
+                    <exclusion>
+                        <groupId>junit</groupId>
+                        <artifactId>junit</artifactId>
+                    </exclusion>
+                    <exclusion>
+                        <groupId>com.google.inject</groupId>
+                        <artifactId>guice</artifactId>
+                    </exclusion>
+                </exclusions>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 
-	<build>
-		<pluginManagement>
-			<plugins>
-				<plugin>
-					<groupId>org.antlr</groupId>
-					<artifactId>antlr4-maven-plugin</artifactId>
-					<version>${antlr.version}</version>
-					<executions>
-						<execution>
-							<goals>
-								<goal>antlr4</goal>
-							</goals>
-						</execution>
-					</executions>
-					<configuration>
-						<visitor>true</visitor>
-					</configuration>
-				</plugin>
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.antlr</groupId>
+                    <artifactId>antlr4-maven-plugin</artifactId>
+                    <version>${antlr.version}</version>
+                    <executions>
+                        <execution>
+                            <goals>
+                                <goal>antlr4</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                    <configuration>
+                        <visitor>true</visitor>
+                    </configuration>
+                </plugin>
+
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-shade-plugin</artifactId>
+                    <version>2.4.3</version>
+                </plugin>
 
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-shade-plugin</artifactId>
-					<version>2.4.3</version>
-				</plugin>
+                <plugin>
+                    <groupId>com.github.os72</groupId>
+                    <artifactId>protoc-jar-maven-plugin</artifactId>
+                    <version>3.3.0.1</version>
+                    <executions>
+                        <execution>
+                            <phase>generate-sources</phase>
+                            <goals>
+                                <goal>run</goal>
+                            </goals>
+                            <configuration>
+                                <protocArtifact>com.google.protobuf:protoc:3.0.0</protocArtifact>
+                                <protocVersion>3.3.0</protocVersion>
+                                <outputTargets>
+                                    <outputTarget>
+                                        <type>java</type>
+                                    </outputTarget>
+                                    <outputTarget>
+                                        <type>grpc-java</type>
+                                        <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.4.0</pluginArtifact>
+                                    </outputTarget>
+                                </outputTargets>
+                            </configuration>
+                        </execution>
+                    </executions>
+                </plugin>
 
-				<plugin>
-					<groupId>com.github.os72</groupId>
-					<artifactId>protoc-jar-maven-plugin</artifactId>
-					<version>3.3.0.1</version>
-					<executions>
-						<execution>
-							<phase>generate-sources</phase>
-							<goals>
-								<goal>run</goal>
-							</goals>
-							<configuration>
-								<protocArtifact>com.google.protobuf:protoc:3.0.0</protocArtifact>
-								<protocVersion>3.3.0</protocVersion>
-								<outputTargets>
-									<outputTarget>
-										<type>java</type>
-									</outputTarget>
-									<outputTarget>
-										<type>grpc-java</type>
-										<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.4.0</pluginArtifact>
-									</outputTarget>
-								</outputTargets>
-							</configuration>
-						</execution>
-					</executions>
-				</plugin>
-			</plugins>
-		</pluginManagement>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-assembly-plugin</artifactId>
+                    <version>2.6</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
 
-		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
-				</configuration>
-			</plugin>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
 
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -278,39 +284,39 @@
                 </configuration>
             </plugin>
 
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-checkstyle-plugin</artifactId>
-				<version>2.17</version>
-				<executions>
-					<execution>
-						<phase>validate</phase>
-						<goals>
-							<goal>check</goal>
-						</goals>
-						<configuration>
-							<skip>${check-style.skip}</skip>
-							<failOnViolation>${check-style.failOnViolation}</failOnViolation>
-							<consoleOutput>true</consoleOutput>
-							<includeTestSourceDirectory>true</includeTestSourceDirectory>
-							<configLocation>${main.basedir}/src/checkstyle/checks.xml</configLocation>
-							<sourceDirectories>
-								<directory>${project.build.sourceDirectory}</directory>
-							</sourceDirectories>
-							<testSourceDirectories>
-								<directory>${project.build.testSourceDirectory}</directory>
-							</testSourceDirectories>
-						</configuration>
-					</execution>
-				</executions>
-				<dependencies>
-					<dependency>
-						<groupId>com.puppycrawl.tools</groupId>
-						<artifactId>checkstyle</artifactId>
-						<version>7.3</version>
-					</dependency>
-				</dependencies>
-			</plugin>
-		</plugins>
-	</build>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>2.17</version>
+                <executions>
+                    <execution>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <skip>${check-style.skip}</skip>
+                            <failOnViolation>${check-style.failOnViolation}</failOnViolation>
+                            <consoleOutput>true</consoleOutput>
+                            <includeTestSourceDirectory>true</includeTestSourceDirectory>
+                            <configLocation>${main.basedir}/src/checkstyle/checks.xml</configLocation>
+                            <sourceDirectories>
+                                <directory>${project.build.sourceDirectory}</directory>
+                            </sourceDirectories>
+                            <testSourceDirectories>
+                                <directory>${project.build.testSourceDirectory}</directory>
+                            </testSourceDirectories>
+                        </configuration>
+                    </execution>
+                </executions>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>7.3</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+        </plugins>
+    </build>
 </project>