在调试器中，我可以看到注释以某种方式工作。但是类AuthorConstraintValidator的方法initialize(AuthorConstraint)和isValid(Author, ConstraintValidatorContext)从未被调用。
我找了好几个小时才找到解决办法。但我不知道少了什么。
软件包：hibernate内核5.6.5.最终版本hibernate验证器6.2.3.最终
批注@AuthorConstraint
package myapp.entity.author.constraint;
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* An annotation for special constraints of authors.
*/
@Constraint(validatedBy = {AuthorConstraintValidator.class})
@Retention(RUNTIME)
@Target({TYPE})
public @interface AuthorConstraint {
String message() default "An author needs either a first name or a last name.";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
ConstraintValidator实现
package myapp.entity.author.constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import myapp.entity.author.Author;
/**
* A validator for special constraints of authors.
*/
public class AuthorConstraintValidator implements ConstraintValidator<AuthorConstraint, Author> {
/**
* {@inheritDoc}
*/
@Override
public void initialize(AuthorConstraint constraintAnnotation) {
}
@Override
public boolean isValid(Author author, ConstraintValidatorContext constraintValidatorContext) {
if (author == null) {
return true;
}
return author.getFirstName() != null || author.getLastName() != null;
}
}
Author类
package myapp.entity.author;
import myapp.data.DatedEntity;
import myapp.entity.author.constraint.AuthorConstraint;
import javax.persistence.*;
import java.io.Serializable;
/**
* Represents an author.
*/
@AuthorConstraint
@Entity
@Table(name = "author")
public class Author extends DatedEntity implements Serializable {
/**
* ID associated with an author.
*/
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
/**
* First name of an author.
*/
@Column(name = "first_name")
private String firstName;
/**
* Last name of an author.
*/
@Column(name = "last_name")
private String lastName;
/**
* Returns the ID associated with an author.
*
* @return Primary key of an author.
*/
public Integer getId() {
return id;
}
/**
* Sets the ID of an author.
*
* @param id the ID of an author
*/
@SuppressWarnings({"unused", "SameParameterValue"})
void setId(Integer id) {
this.id = id;
}
/**
* Returns the first name of an author.
*
* @return First name of an author.
*/
@SuppressWarnings("unused")
public String getFirstName() {
return firstName;
}
/**
* Sets the first name of an author.
*
* @param firstName first name
*/
@SuppressWarnings("unused")
public void setFirstName(String firstName) {
this.firstName = firstName;
}
/**
* Returns the last name of an author.
*
* @return Last name of an author.
*/
@SuppressWarnings("unused")
public String getLastName() {
return lastName;
}
/**
* Sets the last name of an author.
*
* @param lastName last name
*/
@SuppressWarnings("unused")
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
验证器的测试代码
当我自己创建一个验证器对象时，我可以看到它按预期工作。
Author author = new Author();
AuthorConstraintValidator validator = new AuthorConstraintValidator();
validator.initialize(new AuthorConstraint() {
@Override
public Class<? extends Annotation> annotationType() {
return AuthorConstraint.class;
}
@Override
public String message() {
return null;
}
@Override
public Class<?>[] groups() {
return new Class[0];
}
@Override
public Class<? extends Payload>[] payload() {
return new Class[0];
}
});
System.err.println(validator.isValid(author, null));
// result: false
您正在混合支持javax.*注释的组件和支持jakarta.*注释的组件。
如果您使用javax.persistence，则应使用javax.validation，从而使用Hibernate Validator 6.2.x。它仍然受支持，并且具有与HV 7.0.x(针对Jakarta EE 9，从而使用jakarta.validation包(和即将推出的HV 8.0.x(针对雅加达EE 10(相同的功能。
因此，请切换到Hibernate Validator 6.2和Bean Validation 2.0。
您还应该检查EL实现的版本。应该是：
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>jakarta.el</artifactId>
<version>3.0.3</version>
</dependency>
确保你身边没有另一个，因为它们有很多不同的名字。
如果它仍然不起作用，那么有一件事是，默认情况下，Hibernate ORM在尝试初始化Hibernate Validator时不会告诉你是否出了问题。
您可以通过将以下属性设置为CALLBACK:来让它告诉您发生了什么
javax.persistence.validation.group.pre-persistjavax.persistence.validation.group.pre-updatejavax.persistence.validation.group.pre-remove