Question

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?

The error message is as follows:

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

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

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

Thanks.

Answer 1

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.