使用maven创建一个Hibernate测试项目。
当我运行项目时，它会生成异常：
org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator initiateService
WARN: HHH000181: No appropriate connection provider encountered, assuming application will be supplying connections
org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:209)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
at org.hibernate.hibernatetest.App.main(App.java:33)
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.hibernatetest.App.main(App.java:51)
但是在主类中需要设置属性。不知道为什么程序是genrAating异常。
主类：
public class App {
public static void main(String[] args) {
Configuration configuration;
ServiceRegistry serviceRegistry;
SessionFactory sessionFactory;
Session session = null;
try {
configuration = new Configuration();
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
configuration.setProperty("hibernate.dialect ", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
configuration.setProperty("hibernate.connection.url ", "jdbc:sqlite:TailorDB.db");
configuration.setProperty("hibernate.connection.driver_class ", "org.sqlite.JDBC");
configuration.setProperty("hibernate.connection.username ", "");
configuration.setProperty("hibernate.connection.password ", "");
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
session = sessionFactory.openSession();
CustomerModel c = new CustomerModel();
c.setID(5);
c.setNIC_Number("691201631345");
c.setFirstName("Zee");
c.setNumber("55225522");
c.setLastName("Jan");
c.setCustomerCode("Zee-123");
session.beginTransaction();
session.save(c);
session.getTransaction().commit();
} catch (HibernateException e) {
e.printStackTrace();
} finally {
session.close();
}
}
}
在POM文件中：
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.0.Final</version>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.7.2</version>
</dependency>
<dependency>
<groupId>com.applerao</groupId>
<artifactId>hibernatesqlite</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
知道问题出在哪里??
CustomerModel cLass：
@Entity
@Table(name = "Customer")
public class CustomerModel {
@Id
@GeneratedValue
@Column(name = "c_id")
int ID;
@Column(name = "c_code")
String customerCode;
@Column(name = "c_fname")
String firstName;
@Column(name = "c_mname")
String middleName;
@Column(name = "c_lname")
String lastName;
@Column(name = "c_nic")
String NIC_Number;
@Column(name = "c_email")
String email;
@Column(name = "c_pnumber")
String number;
}
答案 0 :(得分：24)
您没有正确初始化configuration，serviceRegistry和sessionFactory。 从Hibernate 4.3.2.Final，引入了StandardServiceRegistryBuilder。请按照此顺序进行初始化，例如
Configuration configuration = new Configuration();
configuration.configure("com/jeecourse/config/hibernate.cfg.xml");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
因此，在您的代码中，您错过了步骤：configuration.configure()。
答案 1 :(得分：7)
这似乎是一个老问题，但现在当我使用4.3.1最终的Hibernate版本时，我也遇到了这个问题。在阅读了许多答案后，似乎他们在文档中没有真正处理它，但我查看了文档，我认为他们有必要的信息。 hibernate配置不一定需要在.properties文件中，但它也可以在xml文件中。
请确保在configure()的实例上调用build()之前调用StandardServiceRegistryBuilder。这是因为configure（）实际上从默认的cfg.xml文件加载配置，而构建实际上使用它。
要理解这一点，你可以做一件事....在调用configure()之前....在getSettings()的内容上调用StandardServiceRegistryBuilder并打印它...它是一个地图。
您将看不到cfg.xml中提到的任何hibernate属性
现在调用configure()并打印getSettings()地图....你会看到......你已经拥有了所有属性。
答案 2 :(得分：4)
在hibernate 4.3中，似乎需要使用hibernate.properties来进行配置， 使用hibernate.cfg.xml只包含.hbm.xml文件， 所以，以下是解决方案：
# jdbc connecition hibernate.connection.driver_class = org.postgresql.Driver hibernate.connection.url = jdbc:postgresql://localhost:5432/xdm hibernate.connection.username = postgres hibernate.connection.password = 123456 # dialect hibernate.dialect = org.hibernate.dialect.PostgreSQL82Dialect # c3p0 hibernate.c3p0.min_size = 2 hibernate.c3p0.max_size = 5 hibernate.c3p0.max_statements = 20 hibernate.jdbc.batch_size = 10 hibernate.c3p0.timeout = 300 hibernate.c3p0.idle_test_period = 3000 hibernate.c3p0.testConnectionOnCheckout = true # other hibernate.show_sql = true hibernate.max_fetch_depth = 3
然后，在hibernate.cfg.xml中，只包含.hbm.xml文件， e.g：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- mapping files -->
<mapping resource="hibernate/model/Event.hbm.xml" />
</session-factory>
</hibernate-configuration>
答案 3 :(得分：1)
在将配置属性应用于StandardServiceRegistryBuilder
configuration.setProperty("hibernate.dialect", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
configuration.setProperty("hibernate.connection.url", "jdbc:sqlite:TailorDB.db");
configuration.setProperty("hibernate.connection.driver_class", "org.sqlite.JDBC");
configuration.setProperty("hibernate.connection.username", "");
configuration.setProperty("hibernate.connection.password", "");
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
此外，在设置属性键时，似乎有一个空格。请删除它们。
根据link，尝试更改此
configuration.setProperty("hibernate.dialect", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
到
configuration.setProperty("dialect", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
答案 4 :(得分：0)
感谢您的解决方案。不知怎的，4.3.5没有从hibernate.cfg.xml获取连接（Dialect）信息，为此使用hibernate.properties文件。
答案 5 :(得分：0)
以下是我在没有hibernate.cfg.xml或hibernate.properties的情况下在代码中进行所有配置所做的工作。用hibernate版本4.3.8.Final测试。希望它会有所帮助。
Configuration configuration = new Configuration();
Properties properties = new Properties();
properties.put(Environment.DRIVER,
com.mysql.jdbc.Driver.class.getName());
properties.put(Environment.USER, "root");
properties.put(Environment.PASS, "root");
properties.put(Environment.HBM2DDL_AUTO, "create");
properties.put(Environment.DIALECT, MySQL5Dialect.class.getName());
properties
.put(Environment.URL, "jdbc:mysql://localhost/hibernate_test");
properties.put(Environment.SHOW_SQL, true);
configuration.setProperties(properties);
configuration.addAnnotatedClass(Stock.class).addAnnotatedClass(
StockDailyRecord.class);
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
SessionFactory sessionFactory = configuration
.buildSessionFactory(serviceRegistry);
答案 6 :(得分：0)
正如他所说的ServiceRegistry：
package org.phenix.hibernate.main;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
// Create the SessionFactory from hibernate.cfg.xml
return configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
答案 7 :(得分：0)
配置对象正在读取hibernate.cfg.xml文件中的所有属性。但是StandardServiceRegistryBuilder对象没有使用这些属性。
这个解决方案对我有用。以下陈述对于完成这项工作至关重要：
ServiceRegistry serviceRegistry =
new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
完整解决方案：
package demo.jaxrs.util;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
System.out.println("Properties: " + configuration.getProperties());
StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
// Create the SessionFactory from hibernate.cfg.xml
return configuration.buildSessionFactory(serviceRegistry);
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
答案 8 :(得分：0)
如果方言由于任何其他原因（例如密码已过期）无法连接，也会发生这种情况。
检查可能揭示原因的任何早期例外。
答案 9 :(得分：0)
就我而言，我试图从Java应用程序连接到Mysql8 +版本的数据库。我面临着同样的问题。错误日志相同，但失败原因不同。
我在Mysql的my.cnf文件中进行了更改，它是：max-connect-errors=1000
默认值为100，但无法使用。因此将其增加到1000，即可开始工作。
需要在失败时查看日志的详细信息。如果日志在任何地方都包含此内容，请尝试使用此东西。
java.sql.SQLException：空，来自服务器的消息：“主机'X'为 由于许多连接错误而被阻止；用'mysqladmin解除阻止 冲洗主机”“
答案 10 :(得分：0)
@id注释
在我的情况下，忘了在所有正确的配置之后添加@id注释，一旦我添加了注释，其工作正常
@Entity
public class demo{
@Id
private long id
}