List in Java converted to JSON error (i)

1. Error description

Exception in thread "main" java.lang.noclassdeffounderror:org/apache/commons/lang/exception/ Nestableruntimeexceptionat Java.lang.ClassLoader.defineClass1 (Native Method) at Java.lang.ClassLoader.defineClass ( classloader.java:800) at Java.security.SecureClassLoader.defineClass (secureclassloader.java:142) at Java.net.URLClassLoader.defineClass (urlclassloader.java:449) at java.net.urlclassloader.access$100 ( urlclassloader.java:71) at Java.net.urlclassloader$1.run (urlclassloader.java:361) at Java.net.urlclassloader$1.run (urlclassloader.java:355) at java.security.AccessController.doPrivileged (Native Method) at Java.net.URLClassLoader.findClass (urlclassloader.java:354) at Java.lang.ClassLoader.loadClass (Classloader.java : 425) at Sun.misc.launcher$appclassloader.loadclass (launcher.java:308) at Java.lang.ClassLoader.loadClass ( classloader.java:358) at Com.you.model.ListToJSON.main (listtojson.java:29) caused by: Java.lang.ClassNotFoundException:org.apache.commons.lang.exception.NestableRuntimeExceptionat java.Net. Urlclassloader$1.run (urlclassloader.java:366) at Java.net.urlclassloader$1.run (urlclassloader.java:355) at Java.security.AccessController.doPrivileged (Native Method) at Java.net.URLClassLoader.findClass ( urlclassloader.java:354) at Java.lang.ClassLoader.loadClass (classloader.java:425) at sun.misc.launcher$ Appclassloader.loadclass (launcher.java:308) at Java.lang.ClassLoader.loadClass (classloader.java:358) ... More

2. Cause of error

/** * Convert List to JSON */package com.you.model;import java.util.arraylist;import Java.util.list;import net.sf.json.jsonarray;/** * @author Youhaidong * */public class Listtojson {/** * @param args */public static void main (St Ring[] args) {list<string> List = new arraylist<string> () List.add ("Spring"); List.add ("Summer"); List.add ("Autumn"); List.add ("Winter"); Jsonarray Jsonarray = jsonarray.fromobject (list); System.out.println ("list converted to JSON:" + jsonarray.tostring ());}}

Missing jar Package

3. Solutions

Copy "Commons-lang-2.4.jar" to Lib

List in Java converted to JSON error (i)