原文链接：https://www.freesion.com/article/99081321457/
案例：本文主要描述如何解决Java+Scala通过Maven混合编译 报错【程序包不存在】
一、报错信息

Error:(2,33) java: 错误: 程序包com.mth.data.minhangk3.dao不存在

二、解决方法：在pom.xml文件中增加插件

         <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.3.1</version>
                <executions>
                    <execution>
                        <id>scala-compile-first</id>
                        <phase>process-resources</phase>
                        <goals>
                            <goal>add-source</goal>
                            <goal>compile</goal>
                        </goals>
                    </execution>

                    <execution>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                     <scalaVersion>${scala.version}</scalaVersion>
                     <!--  <scalaVersion>2.11.8</scalaVersion>  -->
                </configuration>
            </plugin>

注：${scala.version}填写自己的Scala版本，我的是2.11.8