Hibernate Unable to load class []
问题 I recently added a few features (connecting database tables to other tables) using JPA (with hibernate). It worked fine before, but now I'm getting the exception org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [] - or at least I think that's the most relevant part of it. The whole exception is: org.apache.tapestry5.ioc.internal.OperationException: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc