i want to develop a ecommerce website using java from scratch [on hold]

i want to develop a ecommerce website using java from scratch....i dont know how to start from scratch,please tell me some good tutorials or websites which are free to learn web app development using java.

i have worked on php web application development,using cms like drupal,magento,wordpress. but i want to develop ecommerce website using java,bcoz i want to switch my career in to java.

developing web app using php is easy coz several cms and frameworks are there in php,is there any cms or frameworks are there in java,which r easy to learn and can help me to develop a web app.i know core java ,jdbc,servlet.