<build>
 <plugins>
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-compiler-plugin</artifactId>
 <version>3.1</version>
 <configuration>
 <target>1.8</target>
 <source>1.8</source>
 </configuration>
 </plugin>
 </plugins>
 </build>
 <dependencies>
<dependency>
 <groupId>io.netty</groupId>
 <artifactId>netty-all</artifactId>
 <version>4.1.15.Final</version>
 </dependency>
 </dependencies>