title: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
body: <p>I'm trying to retrieve the data from the database. When I run the program it shows the error <code>java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException</code> I have the <code>json-lib</code> jar file in my <code>WEB-INF --&gt; lib</code> directory, I don't know why it is showing this error for <code>JSONArray</code>.</p>
  
  <p>My code is :</p>
  
  <pre><code>        StringBuilder sb=new StringBuilder(1024);
          sb.append("select * from ").append(uname.trim()).append("vcomments").append(" where itemid=").append(itemId).append(" and albumid=").append(albumId);
          sql=sb.toString();
          stmt = conn.prepareStatement(sql);
          ResultSet rs = stmt.executeQuery();
          //ArrayList&lt;String&gt; CommArray=new ArrayList();
          JSONArray arrayObj=new JSONArray();                //#100
  
  
           while(rs.next()){
              Commenter comment = new Commenter();
              comment.setUname(rs.getString("uname").trim());
              comment.setComment(rs.getString("comments").trim());
              arrayObj.add(comment.toString());
  
              }    
           commentObj=gson.toJsonTree(arrayObj);
           myObj.add("commentInfo", commentObj);
           out.println(myObj.toString());
           rs.close();                                                              
           stmt.close();                                                            
           stmt = null;                                                             
  
  
           conn.close();                                                            
           conn = null;                                                  
  
       }                 
  </code></pre>
  
  <p>And the console output is :</p>
  
  <pre><code> SEVERE: Servlet.service() for servlet [VComment] in context with path [/skypark] threw exception [Servlet execution threw an exception] with root cause
  java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClass(Unknown Source)
  at java.security.SecureClassLoader.defineClass(Unknown Source)
  at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2904)
  at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1173)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1681)
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
  at skypark.VComment.doGet(VComment.java:100)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
  at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
  at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)
  </code></pre>
  
  <p>Please anyone tell me how to solve this problem......Thanks....</p>