blocks|key|853895|text|如果你想运行整个项目，它应该有一个“主类”，在你的任何Scala对象中，你都应该定义：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|853896|def+main(args:Array[String])+{+<some+nice+code+here>+}|code-block|syntax|javascript|853897|从那里开始，它应该“调用”其余的对象来执行整个项目所做的任何事情，并且在"Class+Main“列中，您应该指定对象的完全限定名。例如，如果您在包"starter“中名为"Start”的类中定义了main，则应在"Class+Main“字段中声明"starter.Start”。|853898|但另一方面，如果你只想运行一个Scala对象，它应该扩展App，如果它不扩展App，Scala+IDE就不会添加"Run+as+Scala+Application..."：|853899|package+greeter
object+Hello+extends+App+{
++println("Hello,+World!")
}|853900|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you want to run the whole project it should have a "main class", in any of your Scala objects you should be defining:

<pre><code>def main(args:Array[String]) { &lt;some nice code here&gt; }
</code></pre>

From there it should be "calling" the rest of your objects to do whatever the whole project does and in the "Class Main" column you should specify the fully qualified name of your object. For instance, if you defined the main in a class called "Start" in the package "starter", in the "Class Main" field you should state "starter.Start".

But on the other hand if you only want to run a Scala object it should extend App, if it doesn't extend App, Scala IDE won't add the "Run as Scala Application...":

<pre><code>package greeter
object Hello extends App {
 println("Hello, World!")
}
</code></pre>

blocks|key|853956|text|右键单击您的项目并检查"Scala+Compiler“设置。选中"Project+Specific“复选框，并尝试检查是否可以运行Scala对象(这将扩展App)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|853957|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Right click your project and check the "Scala Compiler" settings. Check the "Project Specific" checkbox and try checking if you can run your Scala object (which should extend App).

blocks|key|1068359|text|如果您为Eclipse安装了Scala插件，请打开Scala透视图。然后右键单击您的项目，并在“配置”菜单中选择“添加Scala自然”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068360|现在您应该能够运行Scala应用程序了。|1068361|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you installed Scala plugin for Eclipse, open the Scala perspective. Then right-click on your project and select "Add Scala Nature" in "Configure" menu.

You should now be able to run your Scala applications.

blocks|key|1068524|text|从该链接下载Scala+IDE|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1068525|重启Eclipse，创建Scala+Project，然后创建Scala对象并键入以下内容。|1068526|+package+greeter

++++object+Hello+{
++++++++def+main(args:Array[String])+{+
++++++++++println("Hello,+World")+
++++++++}+++
++++}|code-block|syntax|javascript|1068527|作为Scala应用程序运行|1068528|entityMap|0|LINK|mutability|MUTABLE|url|http://scala-ide.org/download/sdk.html^0|6|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Download from this link <a href="http://scala-ide.org/download/sdk.html" rel="noreferrer">Scala IDE</a>

Restart Eclipse, create Scala Project, then create Scala Object and type this.

<pre><code> package greeter

 object Hello {
 def main(args:Array[String]) { 
 println("Hello, World") 
 } 
 }
</code></pre>

Run as Scala Application

blocks|key|1068661|text|右键单击项目-->单击运行配置-->在运行配置窗口中选择"Scala+Application“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068662|​|1068663|📷|atomic|offset|length|1068664|1068665|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d304ac2e70c907ceb4865300eeaa9d64.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Right click on the Project --> Click on Run Configurations --> In the Run Configurations window select the "Scala Application" 

<a href="https://i.stack.imgur.com/0TJCD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0TJCD.png" alt="Run Configurations Window"></a>

blocks|key|1068571|text|我也有类似的问题。确保您的java和scala文件不在同一个包中。我更改了包的名称，这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1068572|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I was having similar issue. Make sure your java and scala files are not in the same package. I changed the package names and it worked for me

blocks|key|853847|text|除非您有充分的理由需要Eclipse，否则我可以推荐您尝试IntelliJ吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|853848|版本10今天早些时候刚刚发布，(免费)社区版非常乐意使用IntelliJ+Scala插件。|853849|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Unless you have a strong reason why you need Eclipse, could I recommend that you try IntelliJ?

Version 10 was just released earlier today, and the (free) community edition is perfectly happy working with the IntelliJ Scala plugin.

blocks|key|854085|text|只是一个指针..我也遇到过同样的困难。从JAVA中体验到，我没有创建Spark对象，而是创建了spark类，这就是为什么我没有得到这个选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|854086|希望我的经验能帮上忙。|854087|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Just a pointer ..
I had faced same difficulty .
Being experienced from JAVA , instead of creating a Spark object I was creating spark class that why I was not getting this option .

Hope my experience helps .

blocks|key|854221|text|尝试在项目目录中运行sbt工具的eclipse命令，这将为eclipse+IDE构建scala项目。然后你将不会有任何问题来配置你的运行配置，它甚至可以为你自动完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|854222|++++$+sbt
++++>+eclipse+
++++[info]+About+to+create+Eclipse+project+files+for+your+project(s).
++++[info]+Updating+{file:/...path-to-your-project}root...
++++[info]+Resolving+jline#jline;2.12.1+...
++++[info]+Done+updating.
++++[info]+Successfully+created+Eclipse+project+files+for+project(s):
++++[info]+your-project-name|code-block|syntax|javascript|854223|完成了！现在将您的项目导入到Eclipse的工作区|854224|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try to run the eclipse command of the sbt tool inside your project directory, this will build your scala project for the eclipse IDE. Then you will have no problem to configure your run configuration, It might even be done for you automatically.

<pre><code> $ sbt
 &gt; eclipse 
 [info] About to create Eclipse project files for your project(s).
 [info] Updating {file:/...path-to-your-project}root...
 [info] Resolving jline#jline;2.12.1 ...
 [info] Done updating.
 [info] Successfully created Eclipse project files for project(s):
 [info] your-project-name
</code></pre>

done! now import your project into Eclipse's workspace

I am a beginner in Scala. I installed Scala IDE in eclipse and now I want to run my application programme. It never shows "run as Scala application", instead it shows "run as Java application" or "Java applet"

I opened "run configuration" and clicked on "Scala application" and my project name is "test" and second column is of "Class Main". What do I have to fill in? I filled in "Main.Scala", but it states "could not find mainmain class main.scala".

Can you help me with running this project?

configure run in eclipse for Scala

Eclipse

Spark 

Java

我是Scala的初学者。我在eclipse中安装了Scala IDE，现在我想运行我的应用程序。它从不显示"run as Scala application"，而是显示"run as Java application“或"Java applet”。我打开"run configuration“，点击"Scala application”，我的项目名是"test“，第二列是"Class Main”。我

问在eclipse for Scala中配置运行
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回答 9

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