Spark採坑系列（二）使用Scala編寫的工程Maven打包沒有Scala文件

添加下面的maven Scala編譯支持

<plugin>
    <groupId>net.alchim31.maven</groupId>
   <artifactId>scala-maven-plugin</artifactId>
   <version>3.2.2</version>
   <configuration>
      <recompileMode>incremental</recompileMode>
   </configuration>
   <executions>
      <execution>
         <goals>
            <goal>compile</goal>
            <goal>testCompile</goal>
         </goals>
      </execution>
   </executions>
</plugin>