与 Bean Validation API 结合使用时，Hibernate 不遵循 JPA 规范？
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【中文标题】与 Bean Validation API 结合使用时，Hibernate 不遵循 JPA 规范？【英文标题】：Hibernate not following JPA specifications when combined with Bean Validation API? 【发布时间】：2013-02-05 08:41:32 【问题描述】：这个问题是对这个问题的跟进：JPA ConstraintViolation vs Rollback
我对 JPA 和验证 API (JSR-303) 的组合进行了一些测试。
我在JPA specifications（第 101-102 页）中找到了以下内容：
默认情况下，默认的 Bean Validation 组（组 Default）将在 pre-persist 和 pre-update 生命周期验证事件时进行验证
...
如果 validate 方法返回的 ConstraintViolation 对象集不为空，则持久性提供程序必须抛出 javax.validation.ConstraintViolationException，其中包含对返回的 ConstraintViolation 对象集的引用，并且必须将事务标记为回滚。
我设置了以下测试：
HibernateValidator 作为 JSR-303 实现 2 PersistenceProvider Hibernate 和 EclipseLink 一个实体NameNotNullWithDefaultGeneratedStrategy，其 ID 使用默认策略 (@Generated) 和 @NotNull String name 列生成
另一个实体 NameNotNullWithTableGeneratedStrategy 的 id 由表策略 (@TableGenerated) 和 @NotNull String name 列生成
测试尝试persist 每个实体的一个实例，name 为空。
预期结果是persist 方法抛出javax.validation.ConstraintViolationException，事务标记为rollback only（即这些假设基于本文引用的JPA 规范）。
结果是：
使用 eclipse 链接作为提供者：persist 方法为两个实体抛出一个 javax.validation.ConstraintViolationException。
交易在两种情况下都标记为rollback only
使用休眠作为提供程序：
persist 为实体NameNotNullWithDefaultGeneratedStrategy 抛出javax.validation.ConstraintViolationException + 标记为rollback only 的事务
persist 不为实体NameNotNullWithTableGeneratedStrategy + 事务未标记 抛出任何异常rollback only
commit 为 NameNotNullWithTableGeneratedStrategy 失败并出现 RollbackException
问题是：
真的违反了 JPA 规范吗？或者我缺少表格生成策略的特殊情况？ 如果是违规：是否存在任何与之相关的错误报告？这是我的测试代码：
package com.example.jpa.validator;
import org.junit.Assert;
import org.junit.Test;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.RollbackException;
public class ConstraintViolationExceptionTest
@Test
public void testHibernateDefaultStrategy() // Success
testPersistWithNullName("pu-hibernate",new NameNotNullWithDefaultGeneratedStrategy());
@Test
public void testHibernateTableStrategy()
testPersistWithNullName("pu-hibernate",new NameNotNullWithTableGeneratedStrategy());
//this test fail with :
//java.lang.AssertionError: Expecting a javax.validation.ConstraintViolationException, but persist() succeed !
@Test
public void testEclipseLinkDefaultStrategy() // Success
testPersistWithNullName("pu-eclipselink",new NameNotNullWithDefaultGeneratedStrategy());
@Test
public void testEclipseLinkTableStrategy() // Success
testPersistWithNullName("pu-eclipselink",new NameNotNullWithTableGeneratedStrategy());
private void testPersistWithNullName(String persistenceUnitName, Object entity)
EntityManagerFactory emf = Persistence.createEntityManagerFactory(persistenceUnitName);
EntityManager entityManager = emf.createEntityManager();
try
final EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();
try
try
entityManager.persist(entity);
Assert.fail("Expecting a javax.validation.ConstraintViolationException, but persist() succeed !");
catch (javax.validation.ConstraintViolationException cve)
//That's expected
Assert.assertTrue("According JPA specs transaction must be flagged as rollback only",transaction.getRollbackOnly());
catch (Exception e)
Assert.assertTrue("According JPA specs transaction must be flagged as rollback only",transaction.getRollbackOnly());
e.printStackTrace();
Assert.fail("Expecting a javax.validation.ConstraintViolationException, but got " + e.getClass());
transaction.commit();
Assert.fail("persisted with null name !!!");
catch (RollbackException e)
//That's expected
catch (Exception e)
e.printStackTrace();
Assert.fail("Unexpected exception :"+e.getMessage());
finally
entityManager.close();
实体
默认策略
package com.example.jpa.validator;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.validation.constraints.NotNull;
@Entity
public class NameNotNullWithDefaultGeneratedStrategy
@Id @GeneratedValue private Long id;
@NotNull public String name;
public NameNotNullWithDefaultGeneratedStrategy()
表策略：
package com.example.jpa.validator;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.TableGenerator;
import javax.validation.constraints.NotNull;
@Entity
public class NameNotNullWithTableGeneratedStrategy
@GeneratedValue(strategy = GenerationType.TABLE,
generator = "NAME_MUST_NOT_BE_NULL_ID_GENERATOR")
@TableGenerator(name = "NAME_MUST_NOT_BE_NULL_ID_GENERATOR")
@Id @NotNull private Long id;
@NotNull public String name;
public NameNotNullWithTableGeneratedStrategy()
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="pu-hibernate" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.example.jpa.validator.NameNotNullWithTableGeneratedStrategy</class>
<class>com.example.jpa.validator.NameNotNullWithDefaultGeneratedStrategy</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test_mem_hibernate"/>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
</properties>
</persistence-unit>
<persistence-unit name="pu-eclipselink" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.example.jpa.validator.NameNotNullWithTableGeneratedStrategy</class>
<class>com.example.jpa.validator.NameNotNullWithDefaultGeneratedStrategy</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test_mem"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
<property name="eclipselink.target-database" value="org.eclipse.persistence.platform.database.H2Platform"/>
</properties>
</persistence-unit>
</persistence>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>com.example.jpa.validator</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<hibernate.version>4.2.0.CR1</hibernate.version>
<hibernate-validator.version>4.3.1.Final</hibernate-validator.version>
<junit.version>4.11</junit.version>
<h2.version>1.3.170</h2.version>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>$hibernate-validator.version</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>$h2.version</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
<version>$junit.version</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>$hibernate.version</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>$hibernate.version</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>
</dependencies>
<repositories>
<repository>
<url>http://download.eclipse.org/rt/eclipselink/maven.repo/</url>
<id>eclipselink</id>
<layout>default</layout>
<name>Repository for library EclipseLink (JPA 2.0)</name>
</repository>
</repositories>
</project>
【问题讨论】：
@Column(nullable=false) 和 @NotNull 会发生什么？ 我试过@Column(nullable=false)：结果相同
我真的不明白为什么在这种情况下生成策略会影响验证，但是我肯定会打开一个错误报告，因为您已经针对休眠设置了一个可重现的测试用例（好吧，在剥离 eclipselink 部分之后） -验证器。
刚刚回答了类似主题的***.com/questions/16172843/…，另一个答案只是使用.flush() 调用，因为（他们的回答状态）“JPA 仅在与数据库同步时调用 Bean 验证”（这是真的吗？）。我对此进行了测试，它适用于非简单的@GeneratedValue（.saveAndFlush() 也是如此）。只是想让您知道一个潜在的“解决方法”。
【参考方案1】：
我为此提交了错误报告：https://hibernate.onjira.com/browse/HHH-8028
【讨论】：
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