如何从Eclipse部署Scala项目？ [英] How to deploy a Scala project from Eclipse?

问题描述

我在Eclipse中有一个Scala项目，我需要打包，所以我可以将其部署到一个服务器上。它基于Jetty，但它作为独立应用程序运行。它包含Scala类，Java类和多个第三方jar。

我认为Scala Eclipse插件中会有某种部署选项，但是我已经绘制一个空白。

将Scala项目打包成可运行文件以便可以部署的最简单的方法是什么？

任何帮助非常感谢。
干杯。

解决方案

经过大量的尝试和错误，这是我发现用于打包Scala的最好方法应用程序分发：

首先，创建一个Java类作为应用程序的主要入口点，如 Gary Boon 。这允许您使用java命令从JAR运行应用程序。我发现使用java命令运行Scala类是有问题的，即使您的源路径上有Scala库：

  import java.util.ArrayList; 
 
 import scala.tools.nsc.MainGenericRunner; 
 
 
 public class Main {
 public static void main（String [] args）{
 ArrayList< String> argList = new ArrayList< String>（）; 
 argList.add（fully.qualified.ClassName）; 
 for（String s：args）{
 argList.add（s）; 
} 
 MainGenericRunner.main（argList.toArray（new String [0]））; 
} 
} 
  

现在您可以使用Eclipse的导出Runnable JAR 命令将所有的类和库打包成一个JAR文件。将JAR的主类设置为Java入口点。您还可以将Eclipse生成的输出设置保存为ANT构建文件，以便您进行调整。使用ANT使用Java入口点创建JAR产生最佳结果。您还可以以这种方式打包其他JAR依赖关系，这使得在尝试在不同的主机上运行JAR时，它变得更加简单。至少您将需要Scala库和Scala工具JAR。

 < zipfileset excludes =META-INF / * .SFsrc =$ {scala.lib.jar}/> 
< zipfileset excludes =META-INF / *。SFsrc =$ {scala.tools.jar}/> 
  

如果您使用嵌入式Jetty，就像我一样，您可以作为守护进程运行服务器使用以下命令（来源）：

  nohup java -jar MyJettyServer.jar< / dev / null>> server.log 2>> server_error.log& 
  

将程序作为后台进程运行，该过程独立于当前用户会话，因此进程将继续退出主机后。

I have a Scala project in Eclipse that I need to package up so I can deploy it to a server. It's based on Jetty but it runs as a standalone application. It contains Scala classes, Java classes and a number of 3rd party jars.

I assumed there would be some kind of deployment option in the Scala Eclipse plugin but I've drawn a blank.

What is the simplest way to package the Scala project into a runnable file so it can be deployed?

Any help greatly appreciated. Cheers.

解决方案

After a lot of trial and error, this is the best method I found for packaging the Scala app for distribution:

First, create a Java class to be the main entry point for the application as described by Gary Boon. This allows you to run the application from a JAR with the java command. I found that running a Scala class with the java command is problematic, even when you have the Scala libs on the source path:

import java.util.ArrayList;

import scala.tools.nsc.MainGenericRunner;


public class Main { 
    public static void main (String[] args) {
        ArrayList<String> argList = new ArrayList<String>();
        argList.add("fully.qualified.ClassName");
        for (String s : args) {
            argList.add(s);
        }
        MainGenericRunner.main(argList.toArray(new String[0]));
    }
}

Now you can use Eclipse's Export Runnable JAR command to package up all your classes and libraries into a JAR file. Set the JAR's main class to the Java entry point. You can also save the Eclipse-generated output settings as an ANT build file so you can make adjustments. Using ANT to create the JAR with a Java entry point yielded best results. You can also package up other JAR dependancies this way which makes it a whole lot simpler when trying to run the JAR on a different host. As a minimum you will need the Scala library and the Scala tools JAR.

<zipfileset excludes="META-INF/*.SF" src="${scala.lib.jar}"/>
<zipfileset excludes="META-INF/*.SF" src="${scala.tools.jar}"/>

If you're using embedded Jetty, as I am, you can run the server as a Daemon process using the following command (source):

nohup java -jar MyJettyServer.jar < /dev/null >> server.log 2>> server_error.log &

This runs the program as a background process which is independent of the current user session so the process will continue after you logout of the host.

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