从命令提示符运行 jar 时出错
我正在使用 NetBeans IDE 来编写 java 程序。当我从 NetBeans 运行该程序时，它工作正常，但是当我从命令提示符运行它时，我得到以下信息：
Exception in thread "main" java.lang.NoClassDefFoundError: javaapplication/Main
Caused by: java.lang.ClassNotFoundException: javaapplication.Main
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: javaapplication.Main. Program will exit.
我使用另一个程序 (myEclipse) 来构建该程序，但确实发生了这种情况，我只能从以下位置运行该程序IDE 而不是命令提示符。
I'm using NetBeans IDE to code a java program. When I run the program from NetBeans it works perfectly but when I run it from command prompt I get the following:
Exception in thread "main" java.lang.NoClassDefFoundError: javaapplication/Main
Caused by: java.lang.ClassNotFoundException: javaapplication.Main
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: javaapplication.Main. Program will exit.
I used another program (myEclipse) to build the program but the exact thing happened, I'm only able to run the program from the IDE and not command prompt.
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评论（2）
那么，
javaapplication.Main是否意味着主类？如果不是，则可能是清单文件中的错误。如果它是主类，请查看 jar 文件内部（例如，通过提取它）。查找一个名为 javaapplication 的目录，其中应该有一个名为 Main.class 的文件。
这两件事中有一个是错误的，但我们无法真正从这里看出它是什么 - 只有您可以。
Well, is
javaapplication.Mainmeant to be the main class? If not, it's probably a mistake in the manifest file.If it is meant to be the main class, look inside the jar file (e.g. by extracting it). Look for a directory called javaapplication which should have a file called Main.class in.
One of those two things is wrong, but we can't really tell what it is from here - only you can.
当您的 MANIFEST.MF 文件不正确时，通常会发生这种情况。它位于您的 *.jar 文件中。
我的一个项目的示例：
有关更多信息，请参见此处：
http://java.sun.com/developer/Books/javaprogramming /JAR/basics/manifest.html
http://en.wikipedia.org/wiki/Manifest_file
要更改 MANIFEST.MF 文件应该可以解决您的问题。
编辑：回应“Jon Skeet”：我假设您有一个包含该
方法的类。如果您没有主类 - 忘记我的答案并创建一个主类;-)
This normally happens when your MANIFEST.MF file is not correct. It is located in your *.jar file.
An example from one of my projects:
For more Information see here:
http://java.sun.com/developer/Books/javaprogramming/JAR/basics/manifest.html
http://en.wikipedia.org/wiki/Manifest_file
To change your MANIFEST.MF file should fix your problem.
EDIT: in response to "Jon Skeet": I'm assuming that you have a class with the
method. If you don't have a mainclass - forget my answer and create a Main class ;-)