这个问题是这个问题的后续: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 规范(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)将根据 pre-persist 和 pre-update 生命周期验证事件进行验证
...
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包含对返回的 ConstraintViolation 对象集的引用的 javax.validation.ConstraintViolationException,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
- 一个具有默认策略 ( ) 和列
NameNotNullWithDefaultGeneratedStrategy
生成的 id 的实体@Generated
@NotNull String name
- 另一个具有由表策略 ( ) 和列
NameNotNullWithTableGeneratedStrategy
生成的 id 的实体@TableGenerated
@NotNull String name
- 测试尝试
persist
使用 null 对每个实体的一个实例name
。 - 预期结果是
javax.validation.ConstraintViolationException
由persist 方法抛出的,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:
- 该
persist
方法为两个实体抛出一个javax.validation.ConstraintViolationException
。 rollback only
交易在两种情况下都标记为
- 该
- 使用休眠作为提供者:
persist
抛出一个javax.validation.ConstraintViolationException
for entityNameNotNullWithDefaultGeneratedStrategy
+ transaction 标记为rollback only
persist
不要为未标记为的实体NameNotNullWithTableGeneratedStrategy
+事务抛出任何异常rollback only
commit
因为NameNotNullWithTableGeneratedStrategy
失败了RollbackException
问题是:
- 这真的违反了 JPA 规范吗?或者我错过了表格生成策略的特殊情况?
- 如果是违规行为:是否有任何与之相关的现有错误报告?
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() {}
}
持久性.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>