在Maven项目中运行Scala应用程序 [英] Running a scala application in maven project

问题描述

我正在尝试使用Maven处理Eclipse中的scala项目中的依赖项.但是一旦将项目转换为Maven，该应用程序将不再运行.

I am trying to use maven to handle dependencies in a scala project in Eclipse. But once the project is converted to maven, the application wont run anymore.

以下是复制步骤:

1)新的scala项目

1) new scala project

• 项目名称:测试
• 完成

2)新的scala对象

2) new scala object

• 名称:hello_world
• 完成

3)hello_world.scala

3) hello_world.scala

package test

object hello_world {
  def main(args: Array[String]) {
    println("Hello world !!!")
  }
}

4)运行Scala应用程序

4) run scala application

• 项目:测试
• 主类:test.hello_world

结果:工作，您好，世界已打印

result : working, hello world is printed

5)正确选择项目->配置->转换为mavem项目

5) right clic on project -> configure -> convert to mavem project

• 组ID:测试
• 工件ID:测试
• 版本:0.0.1-SNAPSHOT
• 包装:罐子
• 完成

6)运行Scala应用程序

6) run scala application

• 项目:测试
• 主类:test.hello_world

结果:

Error: Could not find or load main class test.hello_world

版本详细信息:

Eclipse 4.4.1 M2E 1.5.0 适用于Eclipse 4.0.0的Scala IDE.nightly-2_11

Eclipse 4.4.1 M2E 1.5.0 Scala IDE for Eclipse 4.0.0.nightly-2_11

生成的pom-xml:

Generated pom-xml :

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>test</groupId>
  <artifactId>test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <resources>
      <resource>
        <directory>src</directory>
        <excludes>
          <exclude>**/*.java</exclude>
        </excludes>
      </resource>
    </resources>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

推荐答案

http://scala-tools .org/repo-releases 已过时，这是一个可运行的pom.xml:

http://scala-tools.org/repo-releases is deprecated, here is a working pom.xml :

<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>test</artifactId>
<version>0.0.1-SNAPSHOT</version>

<repositories>
    <repository>
        <id>scala-tools.org</id>
        <name>Scala-tools Maven2 Repository</name>
        <url>https://oss.sonatype.org/content/groups/scala-tools/</url>
    </repository>
</repositories>

<pluginRepositories>
    <pluginRepository>
        <id>scala-tools.org</id>
        <name>Scala-tools Maven2 Repository</name>
        <url>https://oss.sonatype.org/content/groups/scala-tools/</url>
    </pluginRepository>
</pluginRepositories>

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>2.11.4</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <sourceDirectory>src</sourceDirectory>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <version>3.2.0</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
            </plugin>
        </plugins>
    </pluginManagement>
    <plugins>
        <plugin>
            <groupId>org.scala-tools</groupId>
            <artifactId>maven-scala-plugin</artifactId>
            <executions>
                <execution>
                    <id>scala-compile-first</id>
                    <phase>process-resources</phase>
                    <goals>
                        <goal>add-source</goal>
                        <goal>compile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

</project>

要运行该应用程序:

运行-> scala应用程序

run -> scala application

• 项目:测试
• 主类:test.hello_world

这篇关于在Maven项目中运行Scala应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！