Java “找不到主类：XX。程序将退出。”
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"Could not find the main class: XX. Program will exit."
提问by
I have managed to run my jar file with a command prompt, but its always giving me a reponse of
我已经设法使用命令提示符运行我的 jar 文件，但它总是给我一个响应
Could not find the main class: XX. Program will exit.
找不到主类：XX。程序将会退出。
Please help me out, thanks.
请帮帮我，谢谢。
回答by VonC
See Setting an Application's Entry Point
请参阅设置应用程序的入口点
If you have an application bundled in a JAR file, you need some way to indicate which class within the JAR file is your application's entry point. You provide this information with the Main-Class header in the manifest, which has the general form:
如果您的应用程序捆绑在 JAR 文件中，您需要某种方式来指明 JAR 文件中的哪个类是您的应用程序的入口点。您在清单中的 Main-Class 标头中提供此信息，其具有一般形式：
Main-Class: classname
The value classname is the name of the class that is your application's entry point.
Recall that the entry point is a class having a method with signature
值 classname 是作为应用程序入口点的类的名称。
回想一下，入口点是一个具有签名方法的类
public static void main(String[] args).
After you have set the Main-Class header in the manifest, you then run the JAR file using the following form of the java command:
在清单中设置 Main-Class 标头后，然后使用以下形式的 java 命令运行 JAR 文件：
java -jar JAR-name
The main method of the class specified in the Main-Class header is executed.
执行 Main-Class 标头中指定的类的 main 方法。
We first create a text file named Manifest.txt with the following contents:
我们首先创建一个名为 Manifest.txt 的文本文件，内容如下：
Main-Class: MyPackage.MyClass
Warning: The text file must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return.
We then create a JAR file named MyJar.jar by entering the following command:
警告：文本文件必须以换行或回车结束。如果最后一行没有以新行或回车结束，则不会正确解析。
然后我们通过输入以下命令创建一个名为 MyJar.jar 的 JAR 文件：
jar cfm MyJar.jar Manifest.txt MyPackage/*.class
This creates the JAR file with a manifest with the following contents:
这将创建带有清单的 JAR 文件，其中包含以下内容：
Manifest-Version: 1.0
Created-By: 1.6.0 (Sun Microsystems Inc.)
Main-Class: MyPackage.MyClass
When you run the JAR file with the following command, the main method of MyClass executes:
当您使用以下命令运行 JAR 文件时，MyClass 的 main 方法将执行：
java -jar MyJar.jar
回答by Christian Napierala
I had the same error. The problem was that Windows 10 suddenly decided to set my workspace folder to read-only.
我有同样的错误。问题是 Windows 10 突然决定将我的工作区文件夹设置为只读。
After removing the read-only checkmark in the folder's options, the problem was solved.
去掉文件夹选项中的只读复选标记后，问题就解决了。
