执行jar文件时找不到或加载主类

Question

我已经使用netbeans制作了jar文件，使用Build和Clean项目选项。我得到了.jar文件，现在当我执行它一小段时间后，cmd窗口出现，并给出一个错误：“Could not find or load main class while executing jar file”

但是，如果我使用命令提示符Java-jar“C:\users\varun\documents\netbeansprojects\stockregister\dist\stockregister.jar”执行jar，它可以正常工作

Netbeans的输出为：

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"

而在jar文件中，我将其重命名为.zip并打开，在jar Manifesting的Meta-Inf文件夹中，mf表示：

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

有没有人知道为什么会这样。

Answer 1

您可能已经用main方法定义了多个类。只使用带有main方法的1个类。这将是您的launcher类。（将首先运行）。