Servlet.service() for servlet [tomcat.com.MyTestServlet] in context with path [/MyTest] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: net.sf.json.JSONObject
哈哈哈哈，这么巧，我刚遇到！
将JSON的jar包，放在项目下WebContent->WEB-INF->lib下面即可！
没找到类，把错贴出来要不怎么帮你
Servlet.service() for servlet [tomcat.com.MyTestServlet] in context with path [/MyTest] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: net.sf.json.JSONObject
net.sf.json.JSONObject 应该是这个类没找到
类没找到，试试楼上方法。