Add versions for some plugins

pom.xml

@@ -131,6 +131,7 @@ limitations under the License.
 		<plugins>
 			<plugin>
 				<artifactId>maven-javadoc-plugin</artifactId>
+				<version>2.10.1</version>
 				<executions>
 					<execution>
 						<id>javadoc</id>
@@ -184,6 +185,11 @@ limitations under the License.
 						</archive>
 					</configuration>
 				</plugin>
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-antrun-plugin</artifactId>
+					<version>1.7</version>
+				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-surefire-plugin</artifactId>
@@ -250,6 +256,7 @@ limitations under the License.
 				<plugin>
 					<groupId>org.springframework.boot</groupId>
 					<artifactId>spring-boot-maven-plugin</artifactId>
+					<version>${spring-boot.version}</version>
 					<executions>
 						<execution>
 							<goals>
@@ -265,6 +272,7 @@ limitations under the License.
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-shade-plugin</artifactId>
+					<version>2.2</version>
 					<dependencies>
 						<dependency>
 							<groupId>org.springframework.boot</groupId>