Java HibernateeException:当';hibernate.方言';未设定
使用maven创建Hibernate测试项目 当我运行项目时,它会生成异常:Java HibernateeException:当';hibernate.方言';未设定,java,hibernate,maven,Java,Hibernate,Maven,使用maven创建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.
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)
但在主类中设置了必需的属性。不知道为什么程序生成异常
主要类别:
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>
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,属性键的末尾似乎有一个空格。请把它们拿走
基于,请尝试更改此选项
configuration.setProperty("hibernate.dialect", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
到
您没有正确初始化配置、serviceRegistry和sessionFactory。 从Hibernate 4.3.2.Final开始,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,在代码中,您错过了以下步骤:
configuration.configure()
在hibernate 4.3中,似乎需要使用hibernate.properties进行配置,
使用hibernate.cfg.xml仅包括.hbm.xml文件,
因此,以下是解决方案:
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;
}
}
在类路径中,添加一个文件:hibernate.properties
在这里进行所有配置,
e、 g:
#jdbc连接
hibernate.connection.driver\u class=org.postgresql.driver
hibernate.connection.url=jdbc:postgresql://localhost:5432/xdm
hibernate.connection.username=postgres
hibernate.connection.password=123456
#方言
hibernate.dialogue=org.hibernate.dialogue.postgresql82dialogue
#c3p0
hibernate.c3p0.min_size=2
hibernate.c3p0.max_size=5
hibernate.c3p0.max_语句=20
hibernate.jdbc.batch_size=10
hibernate.c3p0.timeout=300
hibernate.c3p0.idle\u测试周期=3000
hibernate.c3p0.testConnectionOnCheckout=true
#其他
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:
提示:官方文件没有给出这样的提示,我认为这是一件非常糟糕的事情。谢谢你的解决方案。不知何故,4.3.5没有从hibernate.cfg.xml获取连接(方言)信息,请使用hibernate.properties文件 这似乎是个老问题,但现在当我使用4.3.1最终Hibernate版本时,我也遇到了这个问题。在阅读了许多答案之后,他们似乎真的没有在文档中注意到这一点,但我浏览了文档,我认为他们有必要的信息。hibernate配置不需要位于.properties文件中,但也可以位于xml文件中 在调用
StandardServiceRegistryBuilder
实例上的build()
之前,只需确保调用了configure()
。这是因为configure()实际上从默认的cfg.xml文件加载配置,而build实际使用它
要理解这一点,您可以做一件事……在调用configure()
之前。。。。在StandardServiceRegistryBuilder
的屏幕上调用getSettings()
,并将其打印出来……这是一张地图
您将不会看到cfg.xml中提到的任何hibernate属性
现在调用
configure()
并打印getSettings()
map…您将看到…您已经获得了所有属性。以下是我在代码中进行的所有配置,而不使用hibernate.cfg.xml
或hibernate.properties
。使用hibernate版本4.3.8.Final进行测试。希望这会有帮助
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);
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;
}
}
配置对象正在从
hibernate.cfg.xml
文件读取所有属性。但是StandardServiceRegistryBuilder
对象没有使用这些属性
这个解决方案对我有效。以下陈述对于实现这一目标至关重要:
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;
}
}
如果方言由于任何其他原因(如密码过期)无法连接,也可能发生这种情况
检查可能揭示原因的任何早期异常。在我的例子中,我试图连接到DB,它是来自Java应用程序的Mysql8+版本。我面临同样的问题。错误日志相同,但失败的原因不同 我在Mysql的my.cnf文件中做了更改,它是:
max connect errors=1000
默认值为100,但不起作用。所以增加到1000,它就开始工作了
如果发生故障,需要详细查看日志。如果日志在任何地方都包含此内容,请尝试此操作
java.sql.SQLException:null,来自服务器的消息:“主机“X”为
由于许多连接错误而被阻止;使用“mysqladmin”取消阻止
刷新主机“
@实体类中的id注释 在我的例子中,在所有正确的配置之后忘记添加@id注释,一旦我添加了注释,它就可以正常工作了
@Entity
public class demo{
@Id
private long id
}
删除属性末尾的空格IDN不获取哪个空格?有一个空格
configuration.setProperty(“hibernate.dialent(space)”,“com.applerao.hibernatesqlite.dialent.sqlitedialent”)在键值中设置属性时编码>。删除itremoved和相同的结果。您正在尝试连接哪个数据源?你说的方言是什么?当我们想要添加放置在项目目录中的xml配置文件时,会使用自定义oneconfigure(),但我不必使用它,因为我已经在代码中定义了所有配置属性。请在“serviceRegistry”声明后检查。谢谢!我正在跟踪代码片段new StandardServiceRegistryBuilder().build()
导致我出现此问题的地方。在使用了applySettings(configuration.getProperties())
之后,它工作了。在hibernate 4.3中,似乎需要使用hibernate.properties来进行confi。是否有任何参考?thanks@okwap我没有找到,但在尝试之后,当使用hibernate单机版时,它是这样工作的。当与spring一起使用时,它是双向工作的。在这种情况下,缺少.hbm.xml。没有这个
ServiceRegistry serviceRegistry =
new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
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;
}
}
@Entity
public class demo{
@Id
private long id
}