我的问题是我无法在Eclipse IDE上运行我的Scala对象：错误找不到或加载主类
事实上，我之前曾设法使用Scala 2.12（项目/属性/ Scala编译器：Scala安装“最新2.12软件包（动态）”）运行它们，但是由于我想运行Spark Streaming作业，所以我无法保持运行不支持所需类的scala 2.12版本，我移至“最新2.11捆绑包（动态）”。
我在这个问题上进行了很多讨论，但是并没有解决我的问题。
我正在使用Java 8，Eclipse IDE版本：2018-09（4.9.0）。 我创建了一个scala项目，然后将其转换为Maven项目。 我可以向您展示我的以下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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Scala.group</groupId>
<artifactId>NewProject-maven</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>${project.artifactId}</name>
<description>My wonderfull scala app</description>
<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<scala.version>2.11.7</scala.version>
</properties>
<build>
<plugins>
<!--Configure maven-compiler-plugin to use the desired Java version -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin><!-- Use build-helper-maven-plugin to add Scala source and test
source directories -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/main/scala</source>
</sources>
</configuration>
</execution>
<execution>
<id>add-test-source</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/scala</source>
</sources>
</configuration>
</execution>
</executions>
</plugin><!-- Use scala-maven-plugin for Scala support -->
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.2</version>
<executions>
<execution>
<goals><!-- Need to specify this explicitly, otherwise plugin won't
be called when doing e.g. mvn compile -->
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.scala-lang/scala-library -->
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.11.7</version>
</dependency>
<!-- Test -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-streams -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-log4j-appender -->
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-log4j-appender</artifactId>
<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka_2.11</artifactId>
<version>1.6.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.11</artifactId>
<version>1.6.3</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-core -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>1.6.3</version>
</dependency>
</dependencies>
</project>
该项目似乎是通过(Eclipse project explorer window picture)好的方式构建的，没有错误或警告，没有帮助我理解我的问题。
我尝试运行的对象是Hello世界：
package Scala.group.NewProject
object HelloW {
def main(args: Array[String]): Unit = {
println("Hello my little world")
}
}
当我右键单击它并转到“运行”选项时，Eclipse不建议使用“ scala应用程序”，而仅运行“配置...”。我输入主类：“ scalagroupNewProject.HelloW”，因为我无法通过搜索按钮找到它。
我在eclipse上安装了scala IDE，感谢执行以下步骤：Getting started with Eclipse scala IDE。我下载了针对Eclipse download current version的最新版本的scala IDE（我没有设法安装较旧的版本，因为我无法加载older zip files，因为它们不是.jar归档文件或链接。
如果您有想法或遇到同样的问题，我可以回答或显示其他信息。如果您能解决我的问题，或者只是给我一些说明/信息，我将非常感激。
谢谢
托马斯