java lang NoClassDefFoundError org json JSONObject

Question

I am using Eclipse IDE and am writing a servlet  The servlet should accept values from an html file and return JSON response accordingly    My doPost   is   protected void doPost HttpServletRequest req  HttpServletResponse res  throws ServletException  IOException            try                   res setContentType  application json            res setHeader  Cache-Control    nocache                res setCharacterEncoding  utf-8             PrintWriter out   res getWriter             JSONObject json   new JSONObject             String un req getParameter  uname            String pw req getParameter  password             if un equals  xxx    amp  amp  pw equals  xxx                            json put  result    success            else             json put  result    fail             out print json toString                       catch Exception e  System out print  e getMessage                When I run this servlet in Eclipse I get a file download dialog   When run outside Eclipse with Tomcat  I get error   root cause  java lang NoClassDefFoundError  org json JSONObject     Server1 doPost Server1 java 25      javax servlet http HttpServlet service HttpServlet java 647      javax servlet http HttpServlet service HttpServlet java 728   root cause  java lang ClassNotFoundException  org json JSONObject     org apache catalina loader WebappClassLoader loadClass WebappClassLoader java 1713      org apache catalina loader WebappClassLoader loadClass WebappClassLoader java 1558      Server1 doPost Server1 java 25      javax servlet http HttpServlet service HttpServlet java 647      javax servlet http HttpServlet service HttpServlet java 728    The line Server1 doPost Server1 java 25  refers to   JSONObject json   new JSONObject      I have added the org json jar to the build path as well as added it to deployment path in Properties- gt Configure build path- gt Deployment assembly

User · Accepted Answer

No   It is not proper way  Refer the steps    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    For Deployment Assembly  Right click on WAR in eclipse-  Buildpath -  Configure Build path -  Deployment Assembly  left Pane  -  Add -  External file system -  Add -  Select your jar -  Add -  Finish   This is the proper way   Don t forget to remove environment variable  It is not required now   Try this  Surely it will work  Try to use Maven  it will simplify you task

User · Answer

Please add the following dependency  http   mvnrepository com artifact org json json 20080701   lt dependency gt      lt groupId gt org json lt  groupId gt      lt artifactId gt json lt  artifactId gt      lt version gt 20080701 lt  version gt   lt  dependency gt

User · Answer

The Exception it self says it all java lang ClassNotFoundException  org json JSONObject  You have not added the necessary jar file which will be having org json JSONObject class to your classpath   You can Download it From Here

User · Answer

Add json jar to your classpath  or use java -classpath json jar ClassName  refer this

[java] java.lang.NoClassDefFoundError: org/json/JSONObject

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