JSONObject ClassNotFoundException in Servlet

Question

I want to create an JSONObject in my Servlet:

import org.json.JSONObject;
[...]    
Map<String, String> data1 = new HashMap<String, String>();
Map<String, String> data2 = new HashMap<String, String>();
data1.put("name", "f1");
data1.put("key", "aa1");
data1.put("value", "21");
data2.put("name", "f2");
data2.put("key", "aa2");
data2.put("value", "22");

JSONObject json1 = new JSONObject(data1);

But when I run my application, I get the exception:

exception 
javax.servlet.ServletException: Servlet execution threw an exception    

root cause 
java.lang.NoClassDefFoundError: org/json/JSONObject
    servlet.LoginServlet.doPost(LoginServlet.java:71)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)


root cause 
java.lang.ClassNotFoundException: org.json.JSONObject
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    servlet.LoginServlet.doPost(LoginServlet.java:71)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

I have used the following json resource: https://code.google.com/p/org-json-java/downloads/list

Shiladittya Chakraborty · Accepted Answer · 2015-11-30 12:35:10Z

1

Download java-json jar file and add it into class path.

For Classpath reference: Right click on project in eclipse -> Buildpath -> Configure Build path -> Java Build Path (left Pane) -> Libraries(Tab) -> Add External Jars -> Select your jar and select ok.

answered Nov 30, 2015 at 12:35

Shiladittya Chakraborty

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8 Comments

farahm Over a year ago

So the one I got from code.google.com/p/org-json-java/downloads/list is not the right one?

Shiladittya Chakraborty Over a year ago

Did you add this in classpath?

farahm Over a year ago

Yes I had added in Java Build Path --> Libraries --> Add External Jars, but still no same problem

Shiladittya Chakraborty Over a year ago

Can you try with this jar file java2s.com/Code/Jar/j/Downloadjavajsonjar.htm?

farahm Over a year ago

Yeah that one I just tried, but still ClassNotFoundException... :/

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