网页出现如下提示

IDEA上错误如下：
2019-04-19 21:27:28.937 ERROR 22152 — [nio-8080-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is javax.validation.ConstraintViolationException: Validation failed for classes [com.yj.yjblog.domain.User] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
ConstraintViolationImpl{interpolatedMessage=‘邮箱不能为空’, propertyPath=email, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘邮箱不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘账号不能为空’, propertyPath=username, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘账号不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘密码不能为空’, propertyPath=password, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘密码不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘姓名不能为空’, propertyPath=name, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘姓名不能为空’}
]] with root cause

javax.validation.ConstraintViolationException: Validation failed for classes [com.yj.yjblog.domain.User] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
ConstraintViolationImpl{interpolatedMessage=‘邮箱不能为空’, propertyPath=email, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘邮箱不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘账号不能为空’, propertyPath=username, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘账号不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘密码不能为空’, propertyPath=password, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘密码不能为空’}
ConstraintViolationImpl{interpolatedMessage=‘姓名不能为空’, propertyPath=name, rootBeanClass=class com.yj.yjblog.domain.User, messageTemplate=‘姓名不能为空’}
]
at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:140) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:80) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
at org.hibernate.action.internal.EntityIdentityInsertAction.preInsert(EntityIdentityInsertAction.java:197) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:75) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final]
。。。。。。