“在类路径资源中创建名称为'entityManagerFactory'的bean时出错

Question

某个时候可以正常运行的spring-boot项目有一个问题：

Error creating bean with name 'entityManagerFactory' defined in class path resource 
[org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: 
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate