使用json-lib是报异常。请帮我看一下

CandCplus 2014-01-22 05:41:46

我尝试使用json-lib。然后倒入了如下库：

1.commons-lang.jar

2.commons-beanutils.jar

3.commons-collections.jar

4.commons-logging.jar

5.ezmorph.jar

6.json-lib-2.2.2-jdk15.jar

最后还是在代码jsonlab2.java第7行产生了一个异常NoClassDefFoundError。

		JSONObject obj = new JSONObject();  //第7行

		obj.put("name", "tony");

		obj.put("age", 90);

		

		print(obj.toString());

从错误信息看，它提示我需要导入common lang库，事实上我已经倒入了。请问是什么原因引起的呢？
我使用的json-lib的版本是2.4. common lang版本是3.2.3.1

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException

	at java.lang.ClassLoader.defineClass1(Native Method)

	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$100(Unknown Source)

	at java.net.URLClassLoader$1.run(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 com.smartdev.tony.jsonlab2.test(jsonlab2.java:7)

	at com.smartdev.tony.jsonlab.main(jsonlab.java:106)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException

	at java.net.URLClassLoader$1.run(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)

	... 14 more