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实体使用表 id 生成器策略：

@Id
@TableGenerator(name = "id_gen",
        table = "id_gen",
        pkColumnName = "gen_name",
        valueColumnName = "gen_val",
        pkColumnValue = "shared_id_generator", /*same as generator name by default*/
        initialValue = 10, /*0 by default*/
        allocationSize = 100 /*50 by default*/)
@GeneratedValue(strategy = GenerationType.TABLE, generator = "id_gen")
private long id;

所有实体都使用相同的策略和相同的生成器，因此我将表生成器定义移动到 jpa-mapping xml 文件中。Maven项目中的位置：

main/resources/db/jpa/orm.xml

生成器现在在 jpa-mapping xml 文件中定义为：

<table-generator name="id_shared_generator"
                 table="id_gen"
                 pk-column-name="gen_name"
                 pk-column-value="shared_id_value"
                 value-column-name="gen_val"
                 initial-value="10"
                 allocation-size="100" />

现在实体具有以下 id 字段：

@Id
@GeneratedValue(strategy = GenerationType.TABLE, generator = "id_shared_generator")
private long id;

我根本不使用 persistence.xml 文件，而是配置 entityManagerFactory：

    @Bean
    @DependsOn("liquibase")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
        LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();
        emfb.setDataSource(dataSource);
//        emfb.setPersistenceXmlLocation("classpath:META-INF/persistence.xml");
        emfb.setPackagesToScan(new String[]{"com.savdev.springmvcexample.domain"});
        emfb.setMappingResources("db/jpa/orm.xml");
        emfb.setJpaVendorAdapter(jpaVendorAdapter());
        emfb.setJpaProperties( new Properties(){{
            put("hibernate.hbm2ddl.auto", "validate");
            put("hibernate.format_sql", "true");
            put("hibernate.show_sql", "true");
        }});
        emfb.setPersistenceUnitName("springmvcexample");
        return emfb;
    }

现在我在尝试加载 spring 应用程序上下文时遇到以下异常：

原因：org.springframework.beans.factory.BeanCreationException：创建类路径资源[spring/repository-config.xml]中定义的名称为“entityManagerFactory”的bean时出错：调用init方法失败；嵌套异常是 javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build EntityManagerFactory ... 原因：org.hibernate.AnnotationException: Unknown Id.generator: id_shared_generator

请告诉我，我做错了什么？是否允许通过emfb.setMappingResources("db/jpa/orm.xml");调用设置额外的 jpa 映射 xml 文件？

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0 回答 0