使用联接继承时无法构建休眠会话工厂

Question

我有一个类，它定义了一个InheritanceType.JOINED，从中继承了几个类：

基类

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "DISCRIMINATOR")
@Table(name = "BASE_CLASSES", uniqueConstraints = 
@UniqueConstraint(columnNames = { "DISCRIMINATOR", "NAME" }))
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class BaseClass implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
protected Long id;
@Length(max = 60)
@NotNull
@Column(name = "NAME", nullable = false)
private String name;
/* Getters and setters omitted for brevity */

尝试使用 Spring Boot 运行应用程序时，仅此类不会造成任何问题。但是如果我添加其他两个类：

子类1

@Entity
@Table(name = "SUB_CLASS_1")
@DiscriminatorValue("SC1")
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class SubClass1 extends BaseClass {
private static final long serialVersionUID = 1L;
@OneToMany(mappedBy = "subClass1", fetch = FetchType.LAZY)
private Set<SubClass2> subClass2s;

和

子类2

@Entity
@Table(name = "SUB_CLASS_2")
@DiscriminatorValue("SC2")
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class SubClass2 extends BaseClass {
private static final long serialVersionUID = 1L;
@JoinColumn(name = "SUB_CLASS_1_ID", nullable = true)
@ManyToOne(fetch = FetchType.LAZY, optional = true)
private SubClass1 subClass1;

我收到以下错误：org.hibernate.AssertionFailure: Table example.BASE_CLASSES not found.

奇怪的是(在我正在从事的现实生活中的项目中)我可以很好地运行我的测试套件(使用基于 Unitils 的自定义库)，但应用程序无法启动，出现相同的错误。因此，我认为错误可能与我配置实体管理器工厂的方式有关。我在下面包括了完整的堆栈跟踪和配置类。

全栈跟踪为：

12:24:15.278 [main] WARN  net.sf.ehcache.config.ConfigurationFactory - No configuration found. Configuring ehcache from ehcache-failsafe.xml  found in the classpath: jar:file:/C:/Users/crodriguez/.m2/repository/net/sf/ehcache/ehcache-core/2.4.3/ehcache-core-2.4.3.jar!/ehcache-failsafe.xml    
12:24:15.470 [main] ERROR org.hibernate.AssertionFailure - HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): org.hibernate.AssertionFailure: Table example.BASE_CLASSES not found    
12:24:15.470 [main] WARN  org.springframework.context.annotation.AnnotationConfigApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'exampleEntityManagerFactory' defined in class path resource [com/example/demo/configuration/JPAConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: persistence-unit] Unable to build Hibernate SessionFactory    
12:24:15.500 [main] ERROR org.springframework.boot.SpringApplication - Application startup failed    
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'exampleEntityManagerFactory' defined in class path resource [com/example/demo/configuration/JPAConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: persistence-unit] Unable to build Hibernate SessionFactory    
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583)    
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)    
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)    
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)    
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)    
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)    
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)    
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1076)    
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:851)    
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)    
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)    
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)    
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)    
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186)    
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175)    
at com.example.demo.JoinedInheritanceErrorDemoApplication.main(JoinedInheritanceErrorDemoApplication.java:10)    
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: persistence-unit] Unable to build Hibernate SessionFactory    
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:954)    
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:882)    
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)    
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)    
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373)    
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362)    
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642)    
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)    
... 15 common frames omitted    
Caused by: org.hibernate.MappingException: Could not instantiate persister org.hibernate.persister.entity.JoinedSubclassEntityPersister    
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:112)    
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:77)    
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:348)    
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444)    
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879)    
... 21 common frames omitted    
Caused by: org.hibernate.AssertionFailure: Table example.BASE_CLASSES not found    
at org.hibernate.persister.entity.AbstractEntityPersister.getTableId(AbstractEntityPersister.java:5118)    
at org.hibernate.persister.entity.JoinedSubclassEntityPersister.<init>(JoinedSubclassEntityPersister.java:433)    
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)    
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)    
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)    
at java.lang.reflect.Constructor.newInstance(Unknown Source)    
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:96)    
... 25 common frames omitted    

我的配置类是：

@Configuration    
@ComponentScan(basePackages = { "com.example.demo" })    
@EnableJpaRepositories(basePackages = {    
"com.example.demo" }, entityManagerFactoryRef = JPAConfiguration.ENTITY_MANAGER_NAME, transactionManagerRef = JPAConfiguration.TRANSACTION_MANAGER_NAME)    
@PropertySource("classpath:database.properties")    
public class JPAConfiguration {    
public static final String ENTITY_MANAGER_NAME = "entityManagerFactory";    
public static final String TRANSACTION_MANAGER_NAME = "transactionManager";    
public static final String PERSITENCE_UNIT_NAME = "persistence-unit";    
private @Value("${example.datasource.url}") String datasourceUrl;    
private @Value("${example.datasource.username}") String username;    
private @Value("${example.datasource.password}") String password;    
private @Value("${example.datasource.driverClassName}") String driverClassName;    
private @Value("${example.datasource.max-active}") Integer maxActive;    
private @Value("${example.datasource.max-idle}") Integer maxIdle;    
private @Value("${example.datasource.min-idle}") Integer minIdle;    
private @Value("${example.datasource.max-wait}") Integer maxWait;    
private @Value("${example.datasource.initial-size}") Integer initialSize;    
private @Value("${example.datasource.schema}") String defaultSchema;    
@Bean    
@Primary    
public DataSource exampleDataSource() {    
PoolProperties properties = new PoolProperties();    
properties.setUrl(datasourceUrl);    
properties.setUsername(username);    
properties.setPassword(password);    
properties.setDriverClassName(driverClassName);    
properties.setInitialSize(initialSize);    
properties.setMaxActive(maxActive);    
properties.setMaxIdle(maxIdle);    
properties.setMaxWait(maxWait);    
properties.setMinIdle(minIdle);    
return new DataSource(properties);    
}    
@Bean    
@Primary    
public LocalContainerEntityManagerFactoryBean exampleEntityManagerFactory() {    
LocalContainerEntityManagerFactoryBean entityManager = new LocalContainerEntityManagerFactoryBean();    
Properties properties = new Properties();    
properties.setProperty("hibernate.cache.provider_class", "org.hibernate.cache.SingletonEhCacheProvider");    
properties.setProperty("hibernate.cache.use_second_level_cache", "true");    
properties.setProperty("hibernate.cache.use_query_cache", "true");    
properties.setProperty("hibernate.cache.use_structured_entries", "true");    
properties.setProperty("hibernate.cache.region.factory_class",    
"org.hibernate.cache.ehcache.EhCacheRegionFactory");    
properties.setProperty("jadira.usertype.autoRegisterUserTypes", "true");    
properties.setProperty("jadira.usertype.databaseZone", "jvm");    
properties.setProperty("javax.persistence.sharedCache.mode", "ENABLE_SELECTIVE");    
properties.setProperty("hibernate.generate_statistics", "false");    
properties.setProperty("hibernate.hbm2ddl.auto", "create");    
properties.setProperty("hibernate.default_schema", defaultSchema);    
entityManager.setPackagesToScan("com.example.demo.model");    
entityManager.setJpaVendorAdapter(new HibernateJpaVendorAdapter());    
entityManager.setPersistenceUnitName(PERSITENCE_UNIT_NAME);    
entityManager.setJpaProperties(properties);    
entityManager.setDataSource(exampleDataSource());    
return entityManager;    
}    
@Bean    
@Primary    
public PlatformTransactionManager defaultTransactionManager() {    
JpaTransactionManager transactionManager = new JpaTransactionManager();    
transactionManager.setEntityManagerFactory(exampleEntityManagerFactory().getObject());    
return transactionManager;    
}    
}

我已经上传了代码以重现错误到我的GitHub：https://github.com/CarlosR-B/JoinedInheritanceError

编辑

我试图找出导致测试框架和 Spring Boot 之间不同行为的原因。我发现在休眠类MetamodelImpl上创建EntityPerister时会发生错误。

我唯一能找到的是，在构建 EntityPersister 时，测试框架使用的是nullaccessStrategy，而 Spring Boot 使用的是NonstopAwareEntityRegionAccessStrategy。

Answer 1

如果您使用的是MySQL数据库，则可能会遇到以下问题：https://hibernate.atlassian.net/browse/HHH-10490

更改以下行：

properties.setProperty("hibernate.default_schema", defaultSchema);

自：

properties.setProperty("hibernate.default_catalog", defaultSchema);

请注意，您可能还希望将属性名称从"defaultSchema"更改为"defaultCatalog"。

编辑：关于数据库的说明。