PersistenceException：未找到用于名为 default 的持久性单元的模式生成的持久性提供程序
PersistenceException: No persistence provider found for schema generation for persistence-unit named default
我已经尝试设置一个 gradle 任务来运行一个 java main class 来生成一个 SQL 模式。
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
}
我的导出工具：
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;
}
这是我得到的异常：
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：我确实收到警告：
: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
您的代码非常好而且干净。服务器启动时是否有任何其他警告，如 log4j 属性丢失..等，
我认为问题与某些缺少的 jar 或类路径条目有关，但不确定。
据我从你的代码中可以看出，你的 JpaSchemaExport 没有在 Spring 上下文中执行。
当您从 Gradle 或命令行 运行 您的 JpaSchemaExport 时，您创建了自己的 EntityManager，它与 Spring 无关并寻找META-INF 目录中的 persistence.xml 文件。对于 Spring 引导应用程序，不需要此文件，因此可能不存在。
当我 运行 看起来与你的 JpaSchemaExport 相似的东西时
输出类似于
[main] INFO o.h.j.b.i.PersistenceXmlParser - HHH000318: Could not find any META-INF/persistence.xml file in the class path
[main] DEBUG o.h.jpa.HibernatePersistenceProvider - Located and parsed 0 persistence units; checking each
[main] DEBUG o.h.jpa.HibernatePersistenceProvider - Found no matching persistence units 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.example.springboot.jpa.JpaSchemaExport.execute(JpaSchemaExport.java:42)
at
com.example.springboot.jpa.JpaSchemaExport.main(JpaSchemaExport.java:14)
一个 Spring 引导命令行应用程序（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 {
}
}
即您的 JpaSchemaExport 可能会改写为
@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，它可以被您的 Spring 引导应用程序以及您的 JpaSchemaExport.
使用
似乎 Persistence.generateSchema() 使用包含 PersistenceProviderResolver 的 PersistenceProviderResolverHolder 来获取所有可用 PersistenceProvider 的列表。也许你应该在调用 Persistence.generateSchema().
之前尝试将你自己的 PersistenceProviderResolver （只有 2 种方法）实现到 return 你想使用的那个（org.hibernate.jpa.HibernatePersistenceProvider）
PersistenceProviderResolverHolder.setPersistenceProviderResolver(new PersistenceProviderResolver() {
public List<PersistenceProvider> getPersistenceProviders() {
return Collections.singletonList(new HibernatePersistenceProvider());
}
public void clearCachedProviders() {}
});
您需要为使用以下方法以编程方式创建的持久性单元设置显式名称，然后确保调用 afterPropertiesSet() 方法：
emf.setPersistenceUnitName( "puname" );
...
emf.afterPropertiesSet();
使用此名称而不是 "default"
来引用您的持久性单元
正在使用 Spring 引导应用程序生成架构：
import org.hibernate.jpa.AvailableSettings;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import java.util.Properties;
@SpringBootApplication
public class JpaSchemaExport implements CommandLineRunner {
@Autowired LocalContainerEntityManagerFactoryBean entityManagerFactory;
public static void main(String... args) {
new SpringApplicationBuilder(JpaSchemaExport.class).run(args);
}
@Override
public void run(String... args) throws Exception {
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, "./generated-schema.ddl");
// generate sql with semicolon - workaround for HHH-10278
String systemLineSeparator = System.getProperty("line.separator");
System.setProperty("line.separator", ';' + systemLineSeparator);
// get a persistence provider from spring context
entityManagerFactory.getJpaVendorAdapter().getPersistenceProvider().generateSchema(entityManagerFactory.getPersistenceUnitInfo(), persistenceProperties);
System.setProperty("line.separator", systemLineSeparator);
System.exit(0);
}
}
如果我不使用 META-INF/persistence。xml，则无法通过名称找到持久性单元。
我不得不注入 EntityManagerFactory:
@Autowired private LocalContainerEntityManagerFactoryBean emf;
... 并通过 info 对象找到持久性单元：
PersistenceProvider provider = emf.getJpaVendorAdapter().getPersistenceProvider();
provider.generateSchema(emf.getPersistenceUnitInfo(), persistenceProperties);
这对我有用。我希望它也能帮助到其他人。
我已经尝试设置一个 gradle 任务来运行一个 java main class 来生成一个 SQL 模式。
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
}
我的导出工具：
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;
}
这是我得到的异常：
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：我确实收到警告：
: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
您的代码非常好而且干净。服务器启动时是否有任何其他警告，如 log4j 属性丢失..等，
我认为问题与某些缺少的 jar 或类路径条目有关，但不确定。
据我从你的代码中可以看出，你的 JpaSchemaExport 没有在 Spring 上下文中执行。
当您从 Gradle 或命令行 运行 您的 JpaSchemaExport 时，您创建了自己的 EntityManager，它与 Spring 无关并寻找META-INF 目录中的 persistence.xml 文件。对于 Spring 引导应用程序，不需要此文件，因此可能不存在。
当我 运行 看起来与你的 JpaSchemaExport 相似的东西时 输出类似于
[main] INFO o.h.j.b.i.PersistenceXmlParser - HHH000318: Could not find any META-INF/persistence.xml file in the class path
[main] DEBUG o.h.jpa.HibernatePersistenceProvider - Located and parsed 0 persistence units; checking each
[main] DEBUG o.h.jpa.HibernatePersistenceProvider - Found no matching persistence units 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.example.springboot.jpa.JpaSchemaExport.execute(JpaSchemaExport.java:42)
at
com.example.springboot.jpa.JpaSchemaExport.main(JpaSchemaExport.java:14)
一个 Spring 引导命令行应用程序（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 {
}
}
即您的 JpaSchemaExport 可能会改写为
@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，它可以被您的 Spring 引导应用程序以及您的 JpaSchemaExport.
似乎 Persistence.generateSchema() 使用包含 PersistenceProviderResolver 的 PersistenceProviderResolverHolder 来获取所有可用 PersistenceProvider 的列表。也许你应该在调用 Persistence.generateSchema().
PersistenceProviderResolver （只有 2 种方法）实现到 return 你想使用的那个（org.hibernate.jpa.HibernatePersistenceProvider）
PersistenceProviderResolverHolder.setPersistenceProviderResolver(new PersistenceProviderResolver() {
public List<PersistenceProvider> getPersistenceProviders() {
return Collections.singletonList(new HibernatePersistenceProvider());
}
public void clearCachedProviders() {}
});
您需要为使用以下方法以编程方式创建的持久性单元设置显式名称，然后确保调用 afterPropertiesSet() 方法：
emf.setPersistenceUnitName( "puname" );
...
emf.afterPropertiesSet();
使用此名称而不是 "default"
来引用您的持久性单元正在使用 Spring 引导应用程序生成架构：
import org.hibernate.jpa.AvailableSettings;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import java.util.Properties;
@SpringBootApplication
public class JpaSchemaExport implements CommandLineRunner {
@Autowired LocalContainerEntityManagerFactoryBean entityManagerFactory;
public static void main(String... args) {
new SpringApplicationBuilder(JpaSchemaExport.class).run(args);
}
@Override
public void run(String... args) throws Exception {
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, "./generated-schema.ddl");
// generate sql with semicolon - workaround for HHH-10278
String systemLineSeparator = System.getProperty("line.separator");
System.setProperty("line.separator", ';' + systemLineSeparator);
// get a persistence provider from spring context
entityManagerFactory.getJpaVendorAdapter().getPersistenceProvider().generateSchema(entityManagerFactory.getPersistenceUnitInfo(), persistenceProperties);
System.setProperty("line.separator", systemLineSeparator);
System.exit(0);
}
}
如果我不使用 META-INF/persistence。xml，则无法通过名称找到持久性单元。
我不得不注入 EntityManagerFactory:
@Autowired private LocalContainerEntityManagerFactoryBean emf;
... 并通过 info 对象找到持久性单元：
PersistenceProvider provider = emf.getJpaVendorAdapter().getPersistenceProvider();
provider.generateSchema(emf.getPersistenceUnitInfo(), persistenceProperties);
这对我有用。我希望它也能帮助到其他人。