I am using Firefox 45.0 and Dependency added in pom.xml is selenium-firefox-driver 2.53.0.
pom.xml
selenium-firefox-driver 2.53.0
java.lang.NoClassDefFoundError: org/open
This happened with me while trying to update to remote driver to 3.0.1 from 2.53.1. I just reverted it back to 2.53.1 and it went away
org.seleniumhq.selenium selenium-remote-driver 2.53.1