Java.lang.NoSuchMethodError using BasicHttpContext

Question

Hello
I want to write a simple ChatClient.
package com.inz.chat.client;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public class ChatClient
     private HttpClient httpClient;
     private String servletUrl;
     public ChatClient(String urlPrefix)
          this.servletUrl = urlPrefix + "ChatServlet";
          this.httpClient = new DefaultHttpClient();
          connectWithServer();
     private void connectWithServer()
          System.out.println("connect to " + servletUrl);
          HttpGet httpget = new HttpGet(servletUrl);
          try {
               HttpResponse response = this.httpClient.execute(httpget);
               HttpEntity entity = response.getEntity();
               if (entity != null)
                   InputStream instream = entity.getContent();
          } catch (ClientProtocolException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
     public static void main(String[] args)
          String prefix = "http://127.0.0.1:8080/InzChat/";
          new ChatClient(prefix);
}But when i start the program i always get:
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.http.protocol.BasicHttpContext: method <init>()V not found
     at org.apache.http.impl.client.AbstractHttpClient.createHttpContext(AbstractHttpClient.java:273)
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:797)
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
     at com.inz.chat.client.ChatClient.connectWithServer(ChatClient.java:30)
     at com.inz.chat.client.ChatClient.<init>(ChatClient.java:22)
     at com.inz.chat.client.ChatClient.main(ChatClient.java:48)I tried to use httpcore-4.0.jar and httpcore-4.1.jar, but the error is always the same. In other projects I used httpcore-4.1.jar to establish http connections without any problems, but here is something wrong...
Next to the jre1.6 classes and the tomcat 6 classes I have appframework-1.03.jar, commons-codec-1.4.jar, commons-logging-1.1.1.jar, httpclient-4.1.1.jar, httpclient-cache-4.1.1.jar, httpmime-4.1.1.jar set to the classpath, but there seems to be a problem
I' m using Eclipse for develpoment and I hope someone knows what to do here...
Kind regards,
Chang
Edited by: Chang on 02.09.2011 04:58

Answer 1

Hello EJP thanks for your answer.
I put the jar files in the Project Properties->Java Build Path dialog to the project like i did it many times before. Now i added httpcore-4.0.jar and httpcore-4.1.jar to the classpath, but no difference the error is still the same. I don't know which jar files get used at runtime.
Alternatively i put the jar files in a lib folder under the WEB-INF folder, but the error leaves the same.
Can you please explain me the solution a little more detailed.
Kind regards,
Chang