java 运行 JAR 文件找不到主类。程序将会退出
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Running JAR file could not find main class. Program will exit
提问by Jerson Calinawan
I've been looking around the google for this very common problem but found no answer. When i build and clean my project through NetBeans, I only have this content in my manifest.mf
我一直在谷歌上寻找这个非常常见的问题，但没有找到答案。当我通过 NetBeans 构建和清理我的项目时，我的 manifest.mf 中只有这些内容
Manifest-Version: 1.0 X-COMMENT: Main-Class will be added automatically by build
清单版本：1.0 X-COMMENT：主类将通过构建自动添加
I was expecting of something like what others have:
我期待其他人拥有的东西：
Manifest-Version: 1.0
Created-By: 1.7.0_06 (Oracle Corporation)
Main-Class: dpsr.DPSR
..but I don't have it. I already have followed setting up my main class on the properties. and here's my main class by the way:
..但我没有。我已经按照属性设置了我的主类。顺便说一下，这是我的主要课程：
package dpsr;
import javax.swing.UIManager;
public class DPSR {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch(Exception e){
System.out.println("Nimbus isn't available");
}
new frmLogin().setVisible(true);
}
}
..when I run the command in the machine
..当我在机器上运行命令时
java -jar dpsr.jar
java -jar dpsr.jar
it only says
它只说
Could not find the main class: ... Program will exit.
找不到主类：...程序将退出。
I do not want to continue my project unless I resolve this. I need this so that other computers can use my project.
除非我解决了这个问题，否则我不想继续我的项目。我需要这个以便其他计算机可以使用我的项目。
回答by Paul Samsotha
Follow these instructions.
请遵循这些说明。
- Right click on Project, select [Properties].
- Select [Run] node on the left.
- In the [Main Class] test field, use the browsebutton to select the main class you want as the launching class. Press OK
- Clean an Build you project.
- Open the files window and look in YourProject/dist/yourproject.jar/META-INF/MANIFEST.MF. You should see the Main-Classhas been added/changed
- 右键单击项目，选择[属性]。
- 选择左侧的【运行】节点。
- 在 [Main Class] 测试字段中，使用browse按钮选择您想要作为启动类的主类。按OK
- 清理构建你的项目。
- 打开文件窗口并查看 YourProject/dist/yourproject.jar/META-INF/MANIFEST.MF。您应该看到Main-Class已添加/更改
