maven在scalaIDE下构建scala和java混合代码

Question

通过scalaIDE新建一个scala项目，然后convert to maven project。单独clean install scala的类是没有问题的，
但是新建java类之后再在内部引用scala类就会出现找不到符号这样的报错，所以请教各位有没有什么可以解决的方法。
以下是pom.xml的build配置：

<build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
        <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <version>2.15.2</version>
                <executions>
                    <execution>
                        <id>scala-compile-first</id>
                        <goals>
                            <goal>compile</goal>
                            <goal>add-source</goal>
                        </goals>
                        <!-- <configuration>
                            <includes>
                                <include>**/*.scala</include>
                            </includes>
                        </configuration> -->
                    </execution>
                    <execution>
                        <id>scala-test-compile</id>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <scalaVersion>2.10.5</scalaVersion>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.3</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>

        </plugins>
    </build>

Answer 1

我最后解决了这个问题，原因是因为，我的工程里有java调用scala的代码，因此需要在编译时，设置先编译scala代码后编译java代码。方法有两个：
1，在使用mvn命令时，

mvn scala:compile compile

这样使用。
2，编辑pom.xml文件设置编译的先后顺序，这部分我研究的不深，就只放上一个成功的解决方案。

 <plugin>
        <groupId>org.scala-tools</groupId>
        <artifactId>maven-scala-plugin</artifactId>
        <version>2.15.1</version>
        <executions>
          <execution>
            <id>scala-compile</id>
            <phase>process-resources</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
          <execution>
            <id>scala-test-compile</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>testCompile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
        <executions>
          <execution>
            <goals>
              <goal>test-jar</goal>
            </goals>
          </execution>
        </executions>
      </plugin>