I am currently working with JAVA/J2EE domain, my project manager asked me to work for an mobile application development with Ruby RhoMobile, but I don't have idea about these frameworks other than just go through wiki links.
My question is about the learning curve for this framework with java background and some basic knowledge of CSS, Jquery,Javascript. Is there any best online training for Ruby RhoMobile.
Your best option is to contact Tau-Technologies, the primary maintainer of the RhoMobile framework.
They provide the official open source distribution and offer an enterprise grade paid support. For sure they can provide paid training as well as consultancy and customization on the framework.