Problem exception : org.hibernate.mappingexception unknown entity Solution: Your entity is not correctly annotated, you must use the correct annotation .Check your imports. Correct: @javax.persistence.Entity . Wrong: @org.hibernate.annotations.entity
A Full Stack developer who is facing problems in development cycle and here you find solution of errors of those problems.This includes all exception and configuration issues. Solutions which i have written in blog are the one which worked for me after killing my time :) .