Eclipse找不到/加载主类 [英] Eclipse can't find / load main class

问题描述

我的Eclipse（靛蓝）运行正常。我创建了一个简单的类 Hello 。它位于文件夹 ch13 中的包 cont 中。但是，当我尝试从Eclipse运行它时，我从Java虚拟机启动器获取信息：

 找不到主类： cont.Hello。 
  

我试图从这个包运行其他类，它们运行正常（就是存在的类之前）。但是，在这个包中创建的任何新类都有这些问题。实际上，我在Eclipse中创建的任何新类都会遇到这个问题。我决定从命令行检查它的工作原理。似乎问题仍然存在 - 我得到相同的错误。我检查路径，它是 C：\Program Files\Java\jdk1.7.0_02\bin ，这是正确的（注意其他类正在运行Eclipse很好）。我试图运行与 java -cp。您好，并且出现一些错误，起始于 java.lang.NoClassDefFoundError：Hello（错误名称：cont / Hello）。代码本身很简单：

  package cont; 
 
 public class Hello {
 public static void main（String [] args）{
 System.out.println（Hello）; 
} 
 
} 
  

我如何解决它，我的类仍然在Eclipse下运行？

解决方案

.metadata 已损坏。

步骤：

1. 停止eclipse，删除工作区中的.metadata并重新启动eclipse




2. 导入项目




3. 再次运行

PLS注意：使用此方法意味着您也将失去您的项目和插件。你必须重新设置这些。

My Eclipse (Indigo) was running just fine. I created a simple class Hello. It is placed in package cont in the folder ch13. However, when I try to run it from Eclipse I get info from Java Virtual Machine Launcher:

Could not find the main class: cont.Hello.  

I tried to run other classes from this package and they run just fine (that is the classes that existed there before). However any new class I create in this package has these problems. Actually any new class I create in Eclipse runs into this problems. I decided to check how it works from the command line. It seems that the problem still exist - I get same error. I checked the path and it is C:\Program Files\Java\jdk1.7.0_02\bin, which is correct (note the other classes are running from Eclipse just fine). I tried to run with java -cp . Hello and there are some Errors produced starting with java.lang.NoClassDefFoundError: Hello (wrong name: cont/Hello). Code itself is simple:

package cont;

public class Hello {
    public static void main(String[] args){
        System.out.println("Hello");
    }

}

How can I fix it so that my classes still run under Eclipse?

解决方案

.metadata is corrupted.

Steps:

1. Stop eclipse, delete .metadata in workspace and restart eclipse

2. Import Project

3. Run again

PLS NOTE: Using this method means you will lose your projects and plugins as well. You will have to set these all over again.

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