servlets - java.lang.ClassNotFoundException: org.jivesoftware.smack.SmackException$NotConnectedException Smack -

smack not working servlet. however, works fine when copy-paste code , run desktop application. error occurs @ chatserver.java:42 here's code:

servlet (chatserver.java):

import java.io.ioexception; import java.io.printwriter; import java.util.arraylist; import java.util.collection; import java.util.hashmap;  import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse;  import org.jivesoftware.smack.rosterentry;  /**  * servlet implementation class chatserver  */ @webservlet("/chatserver") public class chatserver extends httpservlet {     private static final long serialversionuid = 1l;      /**      * default constructor.       */     public chatserver() {         // todo auto-generated constructor stub     }      /**      * @see httpservlet#doget(httpservletrequest request, httpservletresponse response)      */     protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {      }      /**      * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)      */     protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {             string jid =  request.getparameter("jid");             string pword = request.getparameter("pword");             connection.register(jid, pword, "192.168.1.75", "5222");         }       } 

connection class (connection.java):

import java.util.collection; import org.jivesoftware.smack.connectionconfiguration; import org.jivesoftware.smack.roster; import org.jivesoftware.smack.rosterentry; import org.jivesoftware.smack.saslauthentication; import org.jivesoftware.smack.smackexception.notconnectedexception; import org.jivesoftware.smack.xmppconnection; import org.jivesoftware.smack.packet.presence; import org.jivesoftware.smack.tcp.xmpptcpconnection;    public class connection{      /**      * @param args      */     static xmppconnection connection;      public static void register(string username, string password, string host, string port){         //  username += "@" + host;         string service = host;         connectionconfiguration connconfig =                 new connectionconfiguration(host, integer.parseint(port), service);         connection = new xmpptcpconnection(connconfig);         saslauthentication.supportsaslmechanism("plain", 0);         connconfig.setsecuritymode(connectionconfiguration.securitymode.disabled);         try {             connection.connect();         }catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }         try {             connection.login(username, password);         } catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }          // set status available         presence presence = new presence(presence.type.available);         try {             connection.sendpacket(presence);         } catch (notconnectedexception e) {             // todo auto-generated catch block             e.printstacktrace();         }     }     public static collection<rosterentry> getroster(){         roster roster = connection.getroster();         collection<rosterentry> entries = roster.getentries();         return entries;      }      public static void sendmsg(string jid, string msg_text){      } } 

full stack trace:

java.lang.classnotfoundexception: org.jivesoftware.smack.smackexception$notconnectedexception     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1720)     @ org.apache.catalina.loader.webappclassloader.loadclass(webappclassloader.java:1571)     @ chatserver.create_connection(chatserver.java:73)     @ chatserver.dopost(chatserver.java:52)     @ javax.servlet.http.httpservlet.service(httpservlet.java:646)     @ javax.servlet.http.httpservlet.service(httpservlet.java:727)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:303)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:208)     @ org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:241)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:208)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:220)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:122)     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:504)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:170)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:103)     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:950)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:116)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:421)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1074)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:611)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:314)     @ java.util.concurrent.threadpoolexecutor.runworker(unknown source)     @ java.util.concurrent.threadpoolexecutor$worker.run(unknown source)     @ org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)     @ java.lang.thread.run(unknown source) 

you're missing jar contains org.jivesoftware.smack.smackexception class. need place jar on classpath. since appears servlet running in tomcat should package jar application before deploying it.