如何在jvm上运行scala字节码? [英] How do run scala bytecode on the jvm?

问题描述

如何在jvm上运行已编译的scala代码?

当我尝试以下命令时:

java -cp scala-library.jar -cp bin com.mcmc5.Main

我收到以下错误: Exception in thread "main" java.lang.NoSuchMethodError: main

在scala代码中，我有一个名为Main的对象，并且在其中定义了main函数.如果我做的话就行了 scala -cp bin com.mcmc5.Main ，它工作正常.

有什么我想念的吗?

谢谢你， thejinx0r

这是我的代码: 我希望它在JVM上运行的原因是因为我要实际执行字节码的服务器未安装scala.这是我的主要工具的本质(它具有一些在其之前定义的值和变量，但本质上是:

但是我仍然尝试使用 java -cp scala-library.jar:bin com.mcmc5.Main，我仍然遇到相同的错误.

编辑2 问题解决了.

所以我实际上不相信这一点，但这对我有用.

所以我找到了线程 (如果可以这样称呼)，并说Java通常不喜欢整个 object Main extends Application 但是，这实际上解决了我的问题.通过使用extends Application而不是定义一个名为main的函数，解决了我的问题.我猜这取决于您所使用的scala版本.我目前使用的是Scala 2.9，也许是rc2?还是rc1?

解决方案

在Windows上，

java -cp scala-library.jar;bin com.mcmc5.Main

或其他地方

java -cp scala-library.jar:bin com.mcmc5.Main

只有一个组合的"-cp"选项.鉴于com.mcmc5.Main是使用scalac编译的，这绝对是正确的方法.

How do I run the compiled scala code on jvm?

When I try the following command:

java -cp scala-library.jar -cp bin com.mcmc5.Main

I get the following error: Exception in thread "main" java.lang.NoSuchMethodError: main

In the scala code, I have an object called Main and it has the main function defined in there. It works if I do scala -cp bin com.mcmc5.Main , it works fine.

Is there something that I am missing?

Thank you, thejinx0r

Edit1: Here's my code: The reason why I want it to run on the JVM is because the server where I want to actually execute the bytecode does not have scala installed. This is what my main has essentially (it has some values and variables defined before it, but essentially:

package com.mcmc5
import java.text.{DateFormat, NumberFormat, DecimalFormat, SimpleDateFormat}
import java.util.{Date}
 object Main {  def main( args: Array[String]) = {
        println(numberOfOutputStructures)
        var structureSolver = new MC(20);
        structureSolver.start()
    }
} 

But I still tried using java -cp scala-library.jar:bin com.mcmc5.Main and I still got the same error.

Edit 2 Problem solved.

So I actually don't believe this, but this works for me.

So I had found a thread ( if you can call it that ) and said that java usually does not like the whole object Main extends Application But, that actually solved my problem. By using extends Application instead of defining a function called main solved my problem. I guess it depends on what version of scala you are using. I'm currently on scala 2.9, rc2 perhaps? or rc1?

解决方案

On Windows,

java -cp scala-library.jar;bin com.mcmc5.Main

or elsewhere

java -cp scala-library.jar:bin com.mcmc5.Main

Just a single combined "-cp" option. This is definitely the correct way, given that com.mcmc5.Main was compiled with scalac.

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