JSONObject等实例崩溃 [英] JSONObject etc instantiation crashing

问题描述

我试图学习如何使用JSON并编写一个简单的程序，但是每当实例化JSON对象时，它就会崩溃. 如果在尝试实例化JSONObject或JSONArray时收到此错误，我会丢失什么.我添加了 http://sourceforge.net/projects/json-lib/files/将此JSON库添加到构建路径.我有什么想念的吗?

I am trying to learn how to use JSON and writing a simple program however whenever I instantiate a JSON Object it crashes. What am I missing if I receive this error when trying to instantiate a JSONObject or JSONArray. I have added http://sourceforge.net/projects/json-lib/files/ this JSON library to the build path. Is there anything I am missing?

错误消息如下:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at jsonexp.JSONexp.<init>(JSONexp.java:36)
    at jsonexp.JSONexp.main(JSONexp.java:55)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException

我了解到，当所使用的库依赖于另一个库时，会发生这种错误.

I have learned that this sort of error occurs when the library being used depends on another library.

我不知道如何处理此问题，非常感谢您的帮助.

I do not know how to deal with this problem and would very much appreciate some help.

谢谢.

推荐答案

一种简单的方法是使用 findjar 为您查找包含缺少类的jar，并将其添加到您的lib文件夹中.

A simple way to do this would be to use findjar to find the jar containing missing class for you and add it to you lib folder.

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