Add dependencies in pom.xml file:
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
</dependency>
·····
<build>
<plugins>
···
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<webResources>
<resource>
<directory>../projectName/lib</directory>
<targetPath>WEB-INF/lib</targetPath>
<filtering>false</filtering>
<includes>
<include>**/*.jar</include>
</includes>
</resource>
</webResources>
</configuration>
<version>2.1.1</version>
</plugin>
</plugins>
</build>