当 MANIFEST.MF 中列出该类时，为什么我的 jar 会生成 NoClassDefFoundError？

发布于 2024-10-11 11:56:45 字数 1519 浏览 6 评论 0原文

我已在以下文件夹 usr/local/bin/niidle.jar 中创建了 jar，我的 MANIFEST.MF 文件如下：

  Manifest-Version: 1.0
  Main-Class: com.ensarm.niidle.web.scraper.NiidleScrapeManager
  Class-Path: hector-0.6.0-17.jar

我验证了文件 hector -0.6.0-17.jar 也存在于该文件夹中：

<块引用>
/Projects/EnwelibDatedOct13/Niidle/lib/hector-0.6.0-17.jar

我不想在 MANIFEST.MF 文件中给出完整的类路径名称，因为我必须运行这个 jar在另一台机器上。所以我在 MANIFEST.MF 文件中只给出了 jar 文件名 Class-Path=hector-0.6.0-17.jar 。

尽管在 MANIFEST.MF 文件中提到了类路径，但当我使用命令运行此命令时：

<块引用>
java -jar /usr/local/bin/niidle.jar 参数...

它显示错误消息：

--Exception in thread "main" java.lang.NoClassDefFoundError:
me/prettyprint/hector/api/Serializer
     at
 com.ensarm.niidle.web.scraper.NiidleScrapeManager.main(NiidleScrapeManager.java:21)
 Caused by: java.lang.ClassNotFoundException:
 me.prettyprint.hector.api.Serializer
     at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
     ... 1 more

请给我一个解决此错误消息的方法。

原文

I have created jar in the following folder usr/local/bin/niidle.jar and my MANIFEST.MF file is as follows:

  Manifest-Version: 1.0
  Main-Class: com.ensarm.niidle.web.scraper.NiidleScrapeManager
  Class-Path: hector-0.6.0-17.jar

I verified that the file hector-0.6.0-17.jar is also present in the folder:

/Projects/EnwelibDatedOct13/Niidle/lib/hector-0.6.0-17.jar

I don't want to give full class-path name in MANIFEST.MF file, because I have to run this jar on another machine. So I gave only jar file name Class-Path=hector-0.6.0-17.jar in MANIFEST.MF file.

In spite of mentioning the Class-Path in MANIFEST.MF file, when I run this using command:

java -jar /usr/local/bin/niidle.jar arguments...

It is showing the error message:

--Exception in thread "main" java.lang.NoClassDefFoundError:
me/prettyprint/hector/api/Serializer
     at
 com.ensarm.niidle.web.scraper.NiidleScrapeManager.main(NiidleScrapeManager.java:21)
 Caused by: java.lang.ClassNotFoundException:
 me.prettyprint.hector.api.Serializer
     at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
     ... 1 more

Please give me a solution for this error message.

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