.class 文件存在时出现 Java NoClassDefFoundError

发布于 2024-11-06 05:25:20 字数 1258 浏览 2 评论 0原文

我正在 NetBeans 中开发一个 java 项目，当我按下运行项目按钮时，它运行得很好。但是，我需要从终端运行该程序。我打开了包含类文件 search.class 的目录，并尝试使用以下命令运行它

java search

但是出现错误：

Exception in thread "main" java.lang.NoClassDefFoundError: search (wrong name: search/search)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

我一生都无法弄清楚为什么它说“错误名称”，因为 search.class 存在于该目录中。我唯一的想法是，我从程序中调用了 .jar 文件（它们位于同一目录中），也许我需要在运行时包含它们？

任何帮助将不胜感激！

编辑：所以事实证明这可能是不包含 .jar 文件的问题。我通过进入 dist/ 文件夹来修复它，其中整个项目被打包为 jar 并将其作为 java -jar search.jar 运行

感谢所有反馈！

原文

I am working on a java project in NetBeans and it runs perfectly when I press the run project button. However, I need to run the program from the terminal. I opened up the directory which contains the class file, search.class, and tried running it with

java search

However I get an error:

Exception in thread "main" java.lang.NoClassDefFoundError: search (wrong name: search/search)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

I cannot for the life of me figure out why it says "wrong name" since search.class exists in that directory. My only thought is that there are .jar files which I call from my program (they are in that same directory) and perhaps I need to be including them at runtime?

Any help would be greatly appreciated!

EDIT: So it turns out that it probably was a problem with not including the .jar files. I fixed it by going into the dist/ folder where the entire project is packaged as a jar and running it as java -jar search.jar

Thanks for all the feedback!

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寻梦旅人 2024-11-13 05:25:20

如果您的类位于包中，则必须传递该类的全名。

package org.example;

public class Search {
     ...
}

您必须将其运行为

java org.example.Search

当前目录必须包含 org 子目录，该子目录又包含 Search.class 所在的 example 目录。您可以使用 -cp 参数来指定类文件所在的位置。

If your class is in package, then you must pass the full name of the class.

package org.example;

public class Search {
     ...
}

You will have to run it as

java org.example.Search

The current directory must contain org subdirectory, which in its turn contains example directory where Search.class is located. You can use -cp parameter to specify where your class files are located.

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