Exception org.apache.http.conn.ConnectionKeepAliveStrategy

Asked on August 23, 2014
Caused by: java.lang.ClassNotFoundException: org.apache.http.conn.ConnectionKeepAliveStrategy
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 3 more
I am running spring 4 application and using AsyncClientHttpRequestFactory, but getting run time error. Need Solution.

Replied on August 23, 2014
In my POM, there is jar dependency for httpasyncclient as below
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.0-alpha4</version>
</dependency>

Replied on August 23, 2014
Use version 4.4-alpha1 as below
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4-alpha1</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4-alpha1</version>
</dependency>