Maven编译回复'；没有要编译的源代码'；用于scala项目

我有以下（单个）scala类

[      14253 Oct 30  8:44]  ./pom.xml
[       9083 Oct 30  8:30]  ./scaladem.iml
[        102 Oct 29 19:21]  ./src
[        102 Oct 29 19:21]  ./src/main
[        102 Oct 29 19:21]  ./src/main/scala
[        102 Oct 29 19:21]  ./src/main/scala/com
[        102 Oct 29 19:21]  ./src/main/scala/com/blazedb
[        102 Oct 30  8:30]  ./src/main/scala/com/blazedb/scalademo
[       4646 Oct 30  8:30]  ./src/main/scala/com/blazedb/scalademo/SDemo.scala

以下是pom的适用部分

<plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>scala-maven-plugin</artifactId>
    <version>3.1.6</version>
        <configuration>
          <recompileMode>incremental</recompileMode>
          <javacArgs>
            <javacArg>-Xlint:unchecked</javacArg>
            <javacArg>-Xlint:deprecation</javacArg>
          </javacArgs>
        </configuration>
    <executions>
        <execution>
            <id>scala-compile-first</id>
            <phase>process-resources</phase>
            <goals>
                <goal>add-source</goal>
                <goal>compile</goal>
            </goals>
        </execution>
        <execution>
            <id>scala-test-compile</id>
            <phase>process-test-resources</phase>
            <goals>
                <goal>testCompile</goal>
            </goals>
        </execution>
    </executions>
</plugin>

我们得到（注意“无来源”…）

更新：运行以下命令时

$mvn scala:compile -DdisplayCmd=true

编译成功

根据@Badballown的建议，我添加了如下所示的明确内容

<sourceDirectory>src/main/scala</sourceDirectory>

src/main/scala

---

这甚至可以通过mvn编译实现。但对于混合java/scala项目来说，这将是一个问题

您是否遵循了maven scala插件主页中的配置步骤？

看起来您已经将Scala编译绑定到process resources阶段。关于无源代码的输出来自编译Java的常规maven编译器插件。

下面是一个示例（简单的）pom.xml，我使用它作为Scala编译和使用maven构建的样板：

<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>badtrumpet</groupId>
<artifactId>blog</artifactId>
<version>1.0-SNAPSHOT</version>
<inceptionYear>2013</inceptionYear>
<packaging>jar</packaging>
<properties>
    <scala.version>2.10.2</scala.version>
    <commons.codec.version>1.8</commons.codec.version>
    <grizzled.version>1.0.1</grizzled.version>
    <slf4j-log4j12.version>1.7.5</slf4j-log4j12.version>
</properties>

<repositories>
    <repository>
        <id>Sonatype repository</id>
        <name>Sonatype's Maven repository</name>
        <url>http://oss.sonatype.org/content/groups/public</url>
    </repository>
    <repository>
        <id>scala-tools.org</id>
        <name>Scala-Tools Maven2 Repository</name>
        <url>http://scala-tools.org/repo-releases</url>
    </repository>
    <repository>
        <id>milestone.repo.springsource.org</id>
        <name>repo.springsource.org-milestone</name>
        <url>https://repo.springsource.org/libs-milestone</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>

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>${scala.version}</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>${commons.codec.version}</version>
    </dependency>
    <dependency>
        <groupId>org.clapper</groupId>
        <artifactId>grizzled-slf4j_2.10</artifactId>
        <version>${grizzled.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${slf4j-log4j12.version}</version>
    </dependency>
</dependencies>

<build>
    <sourceDirectory>src/main/scala</sourceDirectory>
    <testSourceDirectory>src/test/scala</testSourceDirectory>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
    </plugins>
</build>
<reporting>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
    </plugins>
</reporting>

4.0.0
恶棍
博客
1.0-快照
2013
罐子
2.10.2
1.8
1.0.1
1.7.5
Sonatype存储库
Sonatype的Maven存储库
http://oss.sonatype.org/content/groups/public
scala-tools.org
Scala工具Maven2存储库
http://scala-tools.org/repo-releases
milestone.repo.springsource.org
repo.springsource.org-milestone
https://repo.springsource.org/libs-milestone
scala-tools.org
Scala工具Maven2存储库
http://scala-tools.org/repo-releases
org.scala-lang
scala图书馆
${scala.version}
朱尼特
朱尼特
3.8.1
测试
通用编解码器
通用编解码器
${commons.codec.version}
org.clapper
灰色-slf4j_2.10
${grizzled.version}
org.slf4j
slf4j-log4j12
${slf4j-log4j12.version}
src/main/scala
src/test/scala
org.scala-tools
maven scala插件
编译
测试编译
${scala.version}
org.scala-tools
maven scala插件
${scala.version}

---

要向maven项目添加额外的源文件夹，可以使用

因此，要将

src/main/scala

添加为源文件夹，您需要在pom中配置以下内容：

org.codehaus.mojo
构建助手maven插件
1.8
添加源
生成源
添加源
${basedir}/src/main/scala

---

对于标准的maven项目，这意味着现在，

src/main/java

和

src/main/scala

都被maven视为源目录。

要混合使用java和scala，只需确保源代码树如下所示：

src 主要的 --爪哇 --斯卡拉 --资源 测试 --爪哇 --斯卡拉 --资源

等等…基本上是一个sane Maven目录结构，然后像这样配置构建部分：

<build>
    <sourceDirectory>src/main/</sourceDirectory>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

总工程师/总工程师/
org.scala-tools
maven scala插件
编译
测试编译
${scala.version}
maven编译器插件
3.1
编译
测试编译
1.7
1.7

由于某些原因，官方文件不适合我，我必须添加以下内容

编译
测试编译

因此，标记下的我的标记如下所示：

net.alchim31.maven
scala maven插件
3.2.0
net.alchim31.maven
scala maven插件
3.2.0
编译
测试编译

我从该页面复制了pom.xml条目。现在我看到的是他们使用mvn scala:compile。那么，这是否意味着mvn compile在默认情况下没有连接到scala？嗯，如果删除生命周期绑定（执行块），它能工作吗？我注释掉了生命周期绑定：没有更改。更新了问题以显示运行mvn scala:compile时是否显式添加了java代码？在这种情况下，这不会被打破吗？顺便说一句，这只适用于scala：现在mvn编译“找到”scala。。但是我们需要java和scala。你只需将普通的maven编译器插件添加到插件部分，将sourceDirectory更改为/src/main，请确保您将java代码放在/src/main/java下，将scala代码放在/src/main/scala下，它应该可以正常工作…将在下面的第二个答案中发布一个pom片段示例，它对我有效…即使在“”下添加“src/main/scala”，mvn compile“仍然对我有相同的警告。有什么建议吗？这里展示了一种更具普遍性的方法

<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>badtrumpet</groupId>
<artifactId>blog</artifactId>
<version>1.0-SNAPSHOT</version>
<inceptionYear>2013</inceptionYear>
<packaging>jar</packaging>
<properties>
    <scala.version>2.10.2</scala.version>
    <commons.codec.version>1.8</commons.codec.version>
    <grizzled.version>1.0.1</grizzled.version>
    <slf4j-log4j12.version>1.7.5</slf4j-log4j12.version>
</properties>

<repositories>
    <repository>
        <id>Sonatype repository</id>
        <name>Sonatype's Maven repository</name>
        <url>http://oss.sonatype.org/content/groups/public</url>
    </repository>
    <repository>
        <id>scala-tools.org</id>
        <name>Scala-Tools Maven2 Repository</name>
        <url>http://scala-tools.org/repo-releases</url>
    </repository>
    <repository>
        <id>milestone.repo.springsource.org</id>
        <name>repo.springsource.org-milestone</name>
        <url>https://repo.springsource.org/libs-milestone</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>

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>${scala.version}</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>${commons.codec.version}</version>
    </dependency>
    <dependency>
        <groupId>org.clapper</groupId>
        <artifactId>grizzled-slf4j_2.10</artifactId>
        <version>${grizzled.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${slf4j-log4j12.version}</version>
    </dependency>
</dependencies>

<build>
    <sourceDirectory>src/main/scala</sourceDirectory>
    <testSourceDirectory>src/test/scala</testSourceDirectory>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
    </plugins>
</build>
<reporting>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
    </plugins>
</reporting>

<build>
    <sourceDirectory>src/main/</sourceDirectory>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <scalaVersion>${scala.version}</scalaVersion>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>