“找不到主类”运行由Eclipse导出的jar时出错 [英] "Could not find the main class" error when running jar exported by Eclipse

问题描述

我有一个java项目在Eclipse中运行时工作得很好。当我尝试将其导出为JAR文件或Runnable JAR文件 .jar文件是创建，但是当我双击它来尝试运行程序，它给我一个错误，说

 无法找到主类：package.MainClassName。程序将退出。 
  

正如我所提到的，我尝试导出到两个JAR选项，我指定了正确的类，主要方法在...中，当我查看 .jar 文件中的实际文件时，一切似乎都是按顺序 - 清单看起来像：

 清单版本：1.0 
主类：package.MainClassName 
（空行）
  

，位于 META-INF 文件夹中。有一个包含我的包名的文件夹，其中包含所有.class文件，包括包含main方法的类。我使用的几个图像和文本文件也出现在jar文件中。

实际的程序不是太复杂 - 这是一个简单的蛇游戏Swing（加上代码都可以在Eclipse内部运行）。

任何想法会导致此错误，以及如何解决？如果还有其他信息，请告诉我。

解决方案

好的，所以我终于得到了。如果我使用JRE 6而不是7，一切都会很好。不知道为什么，但它的作品。

I have a java project that works perfectly fine when running it from within Eclipse. When I try to export it to either a "JAR file" or "Runnable JAR file" the .jar file is created, but when I double click on it to try to run the program it gives me an error that says

"Could not find the main class: package.MainClassName. Program will exit."

As I mentioned, I tried exporting to both JAR options, I specified the correct class that the main method is in, and when I look through the actual files in the .jar file everything seems to be in order -- the manifest looks something like:

Manifest-Version: 1.0
Main-Class: package.MainClassName
(blank line)

and is in the META-INF folder. There is a folder with my package name, which contains all the .class files, including the class that contains the main method. A few image and text files that I use also appear in the jar file.

The actual program isn't anything too complicated -- it's a simple "snake" game using Swing (plus the code all works when run from inside Eclipse).

Any ideas what is causing this error and how I can fix it? Let me know if there's any other information I should provide.

解决方案

Ok, so I finally got it to work. If I use the JRE 6 instead of 7 everything works great. No idea why, but it works.

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