java - 执行 jar 文件时无法找到或加载主类

Question

我已经使用 netbeans、使用“构建和清理项目选项”制作了 jar 文件。我得到了 .jar 文件，现在当我短时间执行它时，会出现 cmd 窗口并给出错误“执行 jar 文件时无法找到或加载主类”

但是如果我使用命令提示符 java -jar 执行 jar "C:\Users\varun\Documents\NetBeansProjects\StockRegister\dist\StockRegister.jar"效果很好

Netbeans 的输出是:

Updating property file: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\built-clean.properties
Deleting directory C:\Users\varun\Documents\NetBeansProjects\StockRegister\build
clean:
init:
deps-jar:
Created dir: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build
Updating property file: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\built-jar.properties
Created dir: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\classes
Created dir: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\empty
Created dir: C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\generated-sources\ap-source-output
Compiling 8 source files to C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\classes
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\Users\varun\Documents\NetBeansProjects\StockRegister\src\stockregister\EnterPurchase.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Copying 17 files to C:\Users\varun\Documents\NetBeansProjects\StockRegister\build\classes
compile:
Created dir: C:\Users\varun\Documents\NetBeansProjects\StockRegister\dist
Copying 1 file to C:\Users\varun\Documents\NetBeansProjects\StockRegister\build
Copy libraries to C:\Users\varun\Documents\NetBeansProjects\StockRegister\dist\lib.
Building jar: C:\Users\varun\Documents\NetBeansProjects\StockRegister\dist\StockRegister.jar
To run this application from the command line without Ant, try:
java -jar "C:\Users\varun\Documents\NetBeansProjects\StockRegister\dist\StockRegister.jar"

在jar文件中，我将其重命名为.zip并打开它，在jar的Meta-Inf文件夹中Manifest.MF 说:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.4
Created-By: 1.7.0_25-b16 (Oracle Corporation)
Class-Path: lib/AbsoluteLayout.jar lib/mysql-connector-java-5.0.8-bin.
 jar lib/swingx-all-1.6.4.jar
X-COMMENT: Main-Class will be added automatically by build
Main-Class: stockregister.StockRegister

有人知道为什么会发生这种情况吗？

Answer 1

您可能使用 ma​​in 方法定义了多个类。仅使用 1 个带有 main 方法的类。这将是您的启动器类。(将首先运行)。