httpclient jar conflicts.How to fix it?

Question

//This is my code and i am working behind proxy ...

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.DefaultProxyRoutePlanner;

{
HttpHost proxy = new HttpHost("proxyhost", 8082); 
DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);
HttpClient client = HttpClients.custom().setRoutePlanner(routePlanner).build();
HttpResponse response = client.execute(request);}

//Following error appears on my console

 Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/ssl/SSLContexts
    at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:966)
    at TwitterFeeds.main(TwitterFeeds.java:40)
    Caused by: java.lang.ClassNotFoundException: org.apache.http.ssl.SSLContexts
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 2 more

I am using following jars

httpclient-4.5.2.jar
httpcore-4.3.jar

Answer 1

The SSLContexts class has been relocated to another package in httpclient 4.4.

Since 4.4

Upgrade your httpcore version to at least 4.4 to fix that.

Answer 2

Please take a look at the answer - Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/ConnectionReuseStrategy:.

Update httpcore version to 4.4. It should work for you.