1. 三者主要区别如下: @NotEmpty :用于集合类,不能为null,且size>0 @NotNull:不能为null,但可以为empty,没有size的约束 @NotBlank:只用于String,不能为null,且trim()之后size>0 2. 通过查看源码注释如下: @NotEmpty /** * Asserts that the annotated string, collection, map or array is not {@code null} or empty. *
org.hibernate.PropertyValueException: not-null property references a null or transient value: com.bjcx.project.entity.task.Equipmenttable.ProjPortfolioID at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72) at org.hibernate.event
Exception in thread "main" java.lang.IllegalArgumentException: Source must not be null at org.springframework.util.Assert.notNull(Assert.java:115) at Test.getaVoid(Test.java:11) at Test.main(Test.java:6) at sun.reflect.NativeMethodAccessorImpl.i
Servlet.service() for servlet default threw exception org.hibernate.PropertyValueException: not-null property references a null or transient value: entity.Favoritebook.user at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72) a
@NotEmpty 用在集合类上面 @NotBlank 用在String上面 @NotNull 用在基本类型上 只有简单的结果,但是再更具体一点的内容就搜不到了,所以去看了看源码,发现了如下的注释: 1. @NotEmpty /** * Asserts that the annotated string, collection, map or array is not {@code null} or empty. * * @author Emmanuel Bernard * @author
@interface NotNull The annotated element must not be {@code null}.Accepts any type.-------------------- @interface NotEmpty * The annotated element must not be {@code null} nor empty. Supported types are:* <ul>* <li>{@code CharSequence} (lengt
1.实体类属性上添加注解规则 如 public class User { @NotBlank private Integer id ; 2.在方法中添加注解@Valid和一个校验结果参数(BindingResult类型) 如 @RequestMapping(value = "/update" ,method = RequestMethod.POST) public String update(@Valid User user ,BindingResult bindingResult){