Java - Jar无法找到包含的库和主类 [英] Java - Jar could not find included libraries and main class

问题描述

我目前正在尝试制作一个包含所有库的Jar。我做了什么，我创建了这样的文件夹：

I am currently trying to make a Jar with all my libraries included. What I have done, I have created folders like this :

eancopy (which contain all my classes)
lib (containing all my libraries : mongo, jedis...)
META-INF/MANIFEST.MF

我的主类命名为进程（在包eancopy中）

My main class is named process (within the package eancopy)

我的清单是这样的：

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Class-Path: lib\commons-pool-1.5.6.jar lib\jedis-2.0.0.jar lib\mongo-2.6.3.jar
Created-By: 1.6.0_24-b07 (Sun Microsystems Inc.)
Main-Class: eancopy.process

我用这个命令生成了JAR：

I have generated the JAR with this command :

jar cvmf META-INF/MANIFEST.MF EANcopy.jar eancopy/*.class lib/*.jar

我的问题：通过执行JAR时java -jar EANcopy.jar ，它在我生成JAR但在另一个地方执行的地方执行我有消息：

My problem : When executing the JAR by java -jar EANcopy.jar, it works when it is executed in the place where I have generated the JAR but in another place I have the message :

Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/DBObject
Caused by: java.lang.ClassNotFoundException: com.mongodb.DBObject
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: eancopy.process. Program will exit.

任何想法？谢谢

推荐答案

类路径属性只发现与jar共存的库而不是jar文件中包含的库。
根据主题，您必须使用特殊的类加载器或使用方法来爆炸jar中包含的库。

Class-path attribute only finds the libraries co-located with your jar not those contained in your jar file. According to this thread, you either have to use a special class loader or use a method to explode the included libraries inside your jar.

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