maven打包时出现打不了包的问题

<build>
   <plugins>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
         <configuration>
            <archive>
               <manifest>
                  <addClasspath>true</addClasspath>
                  <classpathPrefix>lib</classpathPrefix>
                  <mainClass>com.xx.xx.xx.xx.xx</mainClass>
                  <useUniqueVersions>false</useUniqueVersions>
               </manifest>
               <manifestEntries>
                  <class-Path>./</class-Path>
               </manifestEntries>
            </archive>
         </configuration>
      </plugin>
      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-dependency-plugin</artifactId>
         <executions>
            <execution>
               <id>copy</id>
               <phase>package</phase>
               <goals>
                  <goal>copy-dependencies</goal>
               </goals>
               <configuration>
                  <outputDirectory>
                     ${project.build.directory}/lib
                  </outputDirectory>
               </configuration>
            </execution>
         </executions>
      </plugin>
   </plugins>
</build>
是在构建的时候少加了 <useUniqueVersions>false</useUniqueVersions>