注釋參考的ConstraintValidator永遠不會被呼叫，盡管它應該可以作業

在除錯器中，我可以看到注釋以某種方式起作用。但是永遠不會呼叫方法initialize(AuthorConstraint)和isValid(Author, ConstraintValidatorContext)類。AuthorConstraintValidator

我搜索了好幾個小時的解決方案。但我不知道缺少什么。

包：hibernate-core 5.6.5.Final hibernate-validator 6.2.3.Final

注釋@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 {};
}

約束驗證器實作

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;
    }
}

作者類

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;
    }
}

驗證器的測驗代碼

當我自己創建一個驗證器物件時，我可以看到它按預期作業。

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

uj5u.com熱心網友回復：

您正在混合支持javax.*注釋的組件和支持注釋的組件jakarta.*。

如果你正在使用javax.persistence，你應該使用javax.validationHibernate Validator 6.2.x。它仍然受支持，并具有與 HV 7.0.x（針對 Jakarta EE 9 和jakarta.validation包）和即將推出的 HV 8.0.x（針對 Jakarta EE 10）相同的功能。

所以切換到 Hibernate Validator 6.2 和 Bean Validation 2.0。

您還應該檢查您的 EL 實作版本。它應該是：

  <dependency>
     <groupId>org.glassfish</groupId>
     <artifactId>jakarta.el</artifactId>
     <version>3.0.3</version>
  </dependency>

確保您周圍沒有另一個，因為它們有很多不同的名稱。

然后如果它仍然不起作用，一件事是默認情況下 Hibernate ORM 在嘗試初始化 Hibernate Validator 時不會告訴您是否出現問題。

您可以通過將以下屬性設定為CALLBACK：

• javax.persistence.validation.group.pre-persist
• javax.persistence.validation.group.pre-update
• javax.persistence.validation.group.pre-remove

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