Getting error in Module-11 when executing htmlunitdriver

I am not able to run below code for htmlunit drive. can you please let me know from where i can get Jar file which i can import to run below code sucessfully?

HtmlUnitDriver driver = new HtmlUnitDriver();
driver.get("http://www.alexa.com");
System.out.println(driver.getTitle());

I have also gave try to import from one of the source but getting below error.

Exception in thread "main" java.lang.NoClassDefFoundError: org/openqa/selenium/HasInputDevices
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
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)
at Driver.main(Driver.java:21)
Caused by: java.lang.ClassNotFoundException: org.openqa.selenium.HasInputDevices
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)
... 13 more