创建Jar存档会显示“找不到或加载主类". [英] Creating Jar archive gives "Could not find or load main class"

问题描述

$ cat Manifest.txt 
Main-Class: org.fenix.llanfair.Llanfair

$ cat org/fenix/llanfair/Llanfair.java | grep main
public static void main(String[] args) {
$ jar cfm Llanfair.jar Manifest.txt org
$ java -jar Llanfair.jar 
Error: Could not find or load main class org.fenix.llanfair.Llanfair
$ jar -xf Llanfair.jar
$ cat Llanfair/META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Created-By: 1.8.0_25 (Oracle Corporation)
Main-Class: org.fenix.llanfair.Llanfair

$ ls Llanfair/org/fenix/llanfair/ | grep Llanfair
Llanfair$1.class
Llanfair$2.class
Llanfair$MenuItem.class
Llanfair$RecentMenuItem.class
Llanfair.class
$ java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

我希望java -jar Llanfair.jar启动我的应用程序，所以我不确定在这里我做错了什么.我正常运行Java代码时，在lib/中确实有几个文件位于我的类路径中，我是否需要包括这些文件?

I expect java -jar Llanfair.jar to start my application, so I'm not sure what I'm doing wrong here. I do have a couple of files in lib/ which are on my classpath when I run the java code normally, do I need to include those?

如果需要的话，我的操作系统是Mac OS 10.11.1.

My OS is Mac OS 10.11.1, if it matters.

推荐答案

我在清单中缺少Class-Path:值，为什么它以这种方式出现却超出了我的范围.

I was missing the Class-Path: value in the manifest, why it would appear in this way is beyond me.

$ cat Manifest.txt
Class-Path: lib/ui.jar lib/jnativehook-2.0.2.jar
Main-Class: org.fenix.llanfair.Llanfair

$ jar cfm Llanfair.jar Manifest.txt org lib
$ java -jar Llanfair.jar 
<normal application output>
^C$ jar -xf Llanfair.jar
$ ls Llanfair
ls: Llanfair: No such file or directory
<manually extracted Llanfair.jar using Archive Utility>
$ cat Llanfair/META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Class-Path: lib/ui.jar lib/jnativehook-2.0.2.jar
Created-By: 1.8.0_25 (Oracle Corporation)
Main-Class: org.fenix.llanfair.Llanfair

$

稍微复杂一点.我试图将jar依赖项包含在Llanfair.jar中.不允许这样做，因为/reasons/.上面的代码起作用了，因为我在同一目录中运行了jar，所以存在lib/ui.jar，因为我正在使用它进行构建.

It's a little more complex. I was trying to include the jar dependencies in Llanfair.jar. This is not allowed because /reasons/. The above was working because I was running the jar in the same directory -- so lib/ui.jar was present because I was using it to build.

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