I'm new to Java EE.
I wrote a servlet that send back a json as response. I added Simple Json jar to my project, but when the servlet's doPost() called, I get this error:
org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [TodoServlet] in context with path [] threw exception [Servlet execution threw an exception] with root cause java.lang.ClassNotFoundException: org.json.simple.JSONObject
even I added the jar to the class path. Please help, how can I solve it.