使用maven构建一个scala应用程序（混合了java源代码） [英] Building a scala app with maven (that has java source mixed in)

问题描述

我有一个应用程序，我想要混合Java和Scala源（实际上它将Java应用程序迁移到scala - 但有时一点点）。

I have an application where I would like to have mixed Java and Scala source (actually its migrating a java app to scala - but a bit at a time).

我可以在IDE中使这项工作很好，非常好。但是我不知道如何用maven做这个 - scalac可以编译java和scala交织在一起，但是如何为模块设置maven？

I can make this work in IDEs just fine, very nice. But I am not sure how to do this with maven - scalac can compile java and scala intertwined, but how to I set up maven for the module?

另外，我的scala源是否必须是与java不同的文件夹？

Also, does my scala source have to be a different folder to the java?

推荐答案

使用maven scala插件，如下所示的配置适用于混合java和scala源的项目（scala来源当然是在/ scala目录中，如其他人所提到的）。

Using the maven scala plugin, a config like the one below will work for a project that mixes java and scala source (scala source of course goes in the /scala directory, as mentioned by someone else).

你可以运行run mvn compile，test etc ......它会正常工作。非常好（它将自动运行scalac）。

You can run run mvn compile, test etc... and it will all work as normal. Very nice (it will run scalac first automatically).

对于一个出色的IDE，IntelliJ 8可以很好地工作：添加scala插件，然后添加一个scala facet，然后调整scala的编译设置以先运行scalac （如果你对scala和java源有循环依赖关键，那就很关键）。

For a great IDE, IntelliJ 8 works nicely: add in the scala plug in, then add a scala facet, and then adjust the compile setting for scala to run scalac first (critical if you have circular dependencies with scala and java source).

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>demo</groupId>
<artifactId>scala-java-app</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>scala-java-app</name>
<repositories>
    <repository>
        <id>scala-tools.org</id>
        <name>Scala-tools Maven2 Repository</name>
        <url>http://scala-tools.org/repo-releases</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>scala-tools.org</id>
        <name>Scala-tools Maven2 Repository</name>
        <url>http://scala-tools.org/repo-releases</url>
    </pluginRepository>
</pluginRepositories>
<build>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>

                <execution>
                    <id>compile</id>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                    <phase>compile</phase>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <goals>
                        <goal>testCompile</goal>
                    </goals>
                    <phase>test-compile</phase>
                </execution>
                <execution>
                   <phase>process-resources</phase>
                   <goals>
                     <goal>compile</goal>
                   </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.5</source>
                <target>1.5</target>
            </configuration>
        </plugin>
    </plugins>  
</build>
<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>

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