问题描述
如果我双击我的jar文件，我得到找不到主类：HelloWorld。程序将退出。
If I double-click on my jar file, I get "Could not find the main class: HelloWorld. Program will exit."
当我运行它命令行为java -jar HelloWorld.jar它工作正常。
When I run it from the command line as "java -jar HelloWorld.jar" it works fine.
它也可以从Eclipse运行。
It also runs fine from the Eclipse.
其他没有我写的jar文件可以运行双击。
Other jar files, not written by me, run fine from the double click.
我将CLASSPATH变量设置为。并将jdk路径添加到PATH变量中。
I have set CLASSPATH variable to "." and added the jdk path to the PATH variable.
我已经检查过jar是否与javaw.exe相关联
I have checked that jars are associeted with the javaw.exe
要制作一个jar文件，我使用Eclipse-> File->导出 - > Java-> Runnable JAR文件 - >当前项目的启动配置&第一个单选按钮 - >完成
To make a jar file I'm using Eclipse->File->Export->Java->Runnable JAR file->Current project's launch configuration & the first radio button->finish
此外，其他人在尝试运行我的jar时也会收到相同的错误。
Also, other people get the same error when trying to run my jar.
推荐答案
创建jar文件并不是很困难。但是创建一个可启动的jar文件需要更多的步骤：创建一个包含start类的清单文件，创建目标目录并归档文件。
Creating a jar-file is not very difficult. But creating a startable jar-file needs more steps: create a manifest-file containing the start class, creating the target directory and archiving the files.
echo Main-Class: oata.HelloWorld>myManifest
md build\jar
jar cfm build\jar\HelloWorld.jar myManifest -C build\classes .
java -jar build\jar\HelloWorld.jar
检查：
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