PersistenceException:没有为持久性单元命名为default的模式生成找到持久性提供程序

Question

我试图设置一个gradle任务,它运行一个用于生成SQL模式的java主类.

我没有persistence.xml配置文件.

这是我的配置和代码:

我的gradle任务:

task JpaSchemaExport(type: JavaExec){
       description "Exports Jpa schema"
       dependsOn compileJava
       main = "com.bignibou.tools.jpa.JpaSchemaExport"
       classpath = sourceSets.main.runtimeClasspath + configurations.compile
    }

我的出口效用:

public class JpaSchemaExport {

    public static void main(String[] args) throws IOException {
        // execute(args[0], args[1]);
        execute("default", "build/schema.sql");
        System.exit(0);
    }

    public static void execute(String persistenceUnitName, String destination) {
        final Properties persistenceProperties = new Properties();

        // XXX force persistence properties : remove database target
        persistenceProperties.setProperty(org.hibernate.cfg.AvailableSettings.HBM2DDL_AUTO, "");
        persistenceProperties.setProperty(AvailableSettings.SCHEMA_GEN_DATABASE_ACTION, "none");

        // XXX force persistence properties : define create script target from metadata to destination
        // persistenceProperties.setProperty(AvailableSettings.SCHEMA_GEN_CREATE_SCHEMAS, "true");
        persistenceProperties.setProperty(AvailableSettings.SCHEMA_GEN_SCRIPTS_ACTION, "create");
        persistenceProperties.setProperty(AvailableSettings.SCHEMA_GEN_CREATE_SOURCE, "metadata");
        persistenceProperties.setProperty(AvailableSettings.SCHEMA_GEN_SCRIPTS_CREATE_TARGET, destination);

        Persistence.generateSchema(persistenceUnitName, persistenceProperties);
    }
}

我的数据配置:

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
    emf.setPackagesToScan("com.bignibou.domain");
    emf.setDataSource(dataSource);
    emf.setPersistenceProvider(new HibernatePersistenceProvider());
    emf.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
    emf.setJpaPropertyMap(propertiesMap());
    return emf;
}

private Map<String, String> propertiesMap() {
    Map<String, String> propertiesMap = new HashMap<>();
    propertiesMap.put("hibernate.dialect", hibernateDialect);
    propertiesMap.put("hibernate.hbm2ddl.auto", hibernateHbm2ddlAuto);
    propertiesMap.put("hibernate.ejb.naming_strategy", hibernateEjbNamingStrategy);
    propertiesMap.put("hibernate.connection.charSet", hibernateConnectionCharset);
    propertiesMap.put("hibernate.show_sql", hibernateLogSqlInfo);
    propertiesMap.put("hibernate.format_sql", hibernateLogSqlInfo);
    propertiesMap.put("hibernate.use_sql_comments", hibernateLogSqlInfo);
    propertiesMap.put("hibernate.generate_statistics", hibernateGenerateStatistics);
    propertiesMap.put("hibernate.cache.use_second_level_cache", hibernateCacheUseSecondLevelCache);
    propertiesMap.put("hibernate.cache.region.factory_class", "org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory");
    propertiesMap.put("javax.persistence.sharedCache.mode", "ENABLE_SELECTIVE");
    return propertiesMap;
}

这是我得到的例外:

Exception in thread "main" javax.persistence.PersistenceException: No persistence provider found for schema generation for persistence-unit named default
 at javax.persistence.Persistence.generateSchema(Persistence.java:93)
 at com.bignibou.tools.jpa.JpaSchemaExport.execute(JpaSchemaExport.java:31)
 at com.bignibou.tools.jpa.JpaSchemaExport.main(JpaSchemaExport.java:14)

编辑:我确实得到了警告:

:bignibou-server:JpaSchemaExport
2015-05-16 14:46:44,423 [main] WARN  org.hibernate.ejb.HibernatePersistence - HHH015016: Encountered a deprecated javax.persistence.spi.PersistenceProvider [org.hibernate.ejb.HibernatePersistence]; use [org.hibernate.jpa.HibernatePersistenceProvider] instead.
2015-05-16 14:46:44,423 [main] WARN  org.hibernate.ejb.HibernatePersistence - HHH015016: Encountered a deprecated javax.persistence.spi.PersistenceProvider [org.hibernate.ejb.HibernatePersistence]; use [org.hibernate.jpa.HibernatePersistenceProvider] instead.
2015-05-16 14:46:44,423 [main] WARN  org.hibernate.ejb.HibernatePersistence - HHH015016: Encountered a deprecated javax.persistence.spi.PersistenceProvider [org.hibernate.ejb.HibernatePersistence]; use [org.hibernate.jpa.HibernatePersistenceProvider] instead.
Exception in thread "main" javax.persistence.PersistenceException: No persistence provider found for schema generation for persistence-unit named default
 at javax.persistence.Persistence.generateSchema(Persistence.java:93)
 at com.bignibou.tools.jpa.JpaSchemaExport.execute(JpaSchemaExport.java:32)
 at com.bignibou.tools.jpa.JpaSchemaExport.main(JpaSchemaExport.java:14)
:bignibou-server:JpaSchemaExport FAILED 

Answer 1

JpaSchemaExport据我从您的代码中看到，您的内容不是在 Spring 上下文中执行的。

当您JpaSchemaExport从 Gradle 或命令行运行时，您会创建自己的文件EntityManager，与 Spring 无关，并persistence.xml在META-INF目录中查找文件。对于 Spring Boot 应用程序，不需要此文件，因此可能不存在。

当我运行看起来与 JpaSchemaExport 类似的东西时，输出类似于

[主要] INFO ohjbiPersistenceXmlParser - HHH000318：在类路径中找不到任何 META-INF/persistence.xml 文件
[main] DEBUG ohjpa.HibernatePersistenceProvider - 定位并解析 0 个持久单元；检查每个
[main] 调试 ohjpa.HibernatePersistenceProvider - 在线程“main”中找不到匹配的持久性单元异常
javax.persistence.PersistenceException：找不到持久性提供程序
用于名为 default 的持久性单元的模式生成
javax.persistence.Persistence.generateSchema(Persistence.java:93) 在
com.example.springboot.jpa.JpaSchemaExport.execute(JpaSchemaExport.java:42)
    在
com.example.springboot.jpa.JpaSchemaExport.main(JpaSchemaExport.java:14)

Spring Boot 命令行应用程序（具有 Spring 上下文的应用程序）看起来像：

@SpringBootApplication
public class Application implements CommandLineRunner {


    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    @Override
    public void run(String... strings) throws Exception {

    }

}

即你JpaSchemaExport可以重写为

@SpringBootApplication
public class JpaSchemaExport implements CommandLineRunner {


    public static void main(String[] args) {
        // maybe activate a special spring profile to enable 
        // "hibernate.hbm2ddl.auto", validate | update | create | create-drop
        // AvailableSettings.SCHEMA_GEN_DATABASE_ACTION, "none" 
        // AvailableSettings.SCHEMA_GEN_CREATE_SCHEMAS, "true"
        // AvailableSettings.SCHEMA_GEN_SCRIPTS_ACTION, "create"
        // AvailableSettings.SCHEMA_GEN_CREATE_SOURCE, "metadata"
        // AvailableSettings.SCHEMA_GEN_SCRIPTS_CREATE_TARGET, destination

        SpringApplication.run(JpaSchemaExport.class);
    }

    @Override
    public void run(String... strings) throws Exception {
       // nothing needed here 
    }

}

作为替代方案，您可以创建一个META-INF/persistence.xml可供您的 Spring Boot 应用程序以及您的JpaSchemaExport.