Java 当'；hibernate.方言'；未设定

在使用spring3设置hibernate时遇到更多问题。这次是说连接是nul，因为没有设置hibernate.cfg.xml文件中的方言

以下是完全例外：

    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in URL [file:war/WEB-INF/datasource-config.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:96)
    at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:44)
    at org.springframework.test.context.TestContext.buildApplicationContext(TestContext.java:198)
    at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:233)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:126)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:85)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:231)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:95)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:139)
    at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
    at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
    at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set
    at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:97)
    at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:67)
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:172)
    at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2270)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2266)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1735)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775)
    at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:184)
    at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:314)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    ... 29 more

这是我的dataSource-config.xml，它设置了会话工厂

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
   http://www.springframework.org/schema/beans 
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/tx 
   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-3.0.xsd
      ">


    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${database.driver}" />
        <property name="url" value="${database.url}" />
        <property name="username" value="${database.user}" />
        <property name="password" value="${database.password} " />
    </bean>

    <bean id="mySessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource" />
        <property name="packagesToScan" value="com.jr.freedom"/>
        <property name="hibernateProperties" value="classpath:hibernate.cfg.xml"/>

    </bean>

    <!-- Declare a transaction manager -->
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager"
        p:sessionFactory-ref="mySessionFactory" />

</beans>

编辑：这是一个完整的堆栈跟踪。访问数据库可能是个问题，但我可以通过命令提示符成功地访问它吗

   2288 [main] WARN  org.hibernate.engine.jdbc.internal.JdbcServicesImpl  - HHH000342: Could not obtain connection to query metadata : Cannot create PoolableConnectionFactory (Access denied for user 'root'@'localhost' (using password: YES))
2289 [main] INFO  org.springframework.beans.factory.support.DefaultListableBeanFactory  - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@4f549ceb: defining beans [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.validation.beanvalidation.LocalValidatorFactoryBean#0,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0,org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0,org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0,org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0,org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,org.springframework.web.servlet.config.viewControllerHandlerMapping,userService,myDataSource,mySessionFactory,transactionManager,propertyConfigurer,org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0,viewResolver,org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0,hello,userController,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.internalPersistenceAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy
2289 [main] DEBUG org.springframework.beans.factory.support.DisposableBeanAdapter  - Invoking destroy method 'close' on bean with name 'myDataSource'
2289 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory  - Retrieved dependent beans for bean '(inner bean)#14': [org.springframework.web.servlet.config.viewControllerHandlerMapping]
2289 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory  - Retrieved dependent beans for bean '(inner bean)#8': [org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0]
2289 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory  - Retrieved dependent beans for bean '(inner bean)#1': [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0]
2290 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory  - Retrieved dependent beans for bean '(inner bean)': [org.springframework.web.servlet.handler.MappedInterceptor#0]

---

缺少数据库连接。在hibernate.cfg.xml文件中添加如下行

<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">
    jdbc:mysql://localhost:3306/your_database
</property>
<property name="connection.username">your_user</property>
<property name="connection.password">your_password</property>

com.mysql.jdbc.Driver
jdbc：mysql://localhost:3306/your_database
您的用户
你的密码

---

（如果您的计算机上没有安装数据库，请替换localhost，并在我的示例中设置以

your

开头的值）。

我认为您的

datasource config.xml

不在类路径中

而不是将此文件放在

WEB-INF/datasource config.xml

---

将它复制到

WEB-INF/classes/datasource config.xml

I您正在使用hibernate和

InnoDB

为什么不将

hibernate.dial

设置为

org.hibernate.dial.MySQL5

或

org.hibernate.dial.MySQL

---

还有到hibernate.connection.url的连接属性，我也遇到了同样的问题。从Apache Commons数据源切换：

<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="driverClassName" value="${database.driver}" />
    <property name="url" value="${database.url}" />
    <property name="username" value="${database.user}" />
    <property name="password" value="${database.password} " />
</bean>

至C3P0：

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUrl" value="jdbc:mysql://ipadress:3306/schema" />
    <property name="user" value="root" />
    <property name="password" value="abc" />
</bean>

---

解决了我的问题。也许有人可以解释为什么，我很高兴它能工作，并想分享我所知的一点：）

我想你没有配置hibernate.cfg.xml。

Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
SessionFactory factory = configuration.buildSessionFactory();

---

您没有发布会话工厂初始化代码。但我想这和我的问题是一样的

从Hibernate 4.3.2.Final开始，引入了StandardServiceRegistryBuilder。请按照此顺序初始化，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);

---

请仔细检查您的代码。

我认为您没有创建如下配置

Configuration conf = new Configuration().configure();

---

最好分别创建

ServiceRegistry

实例并将其传递给

buildSessionFactory

可能会导致此错误。尝试创建

SessionFactory

实例，如下所示：

private static SessionFactory factory;
factory = cfg.buildSessionFactory(
          new ServiceRegistryBuilder().applySettings(cfg.getProperties())
         .buildServiceRegistry());

---

我认为问题在于没有在应用程序中加载

hibernate.cfg.xml

文件

我也有同样的问题。我在项目中尝试了以下代码：

Configuration cfg = new Configuration();
cfg.configure("hibernate.cfg.xml");

那么，它工作得很好。

---

希望这会有所帮助。

我认为在创建如下配置对象后卸载hibernate.cfg.xml文件会导致错误：

Configuration config = new Configuration();
config.configure("hibernate.cfg.xml");

---

我也有同样的问题，问题是，我的计算机没有进入postgres数据库的pg_hba.conf，该数据库允许哪些客户端（IP地址）与数据库对话

---

顺便说一句：其他用户告诉我们，如果他们忘记在本地启动数据库服务，也会出现错误

如果您的mysql连接器版本和mysql安装程序版本不同，则会出现此问题

在内部，由于以下原因，它将抛出：

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException：客户端不支持服务器请求的身份验证协议；考虑升级MySQL客户端。

---

因此，您需要使您的mysql连接器版本和mysql安装程序版本相同…

在persistence.xml文件中添加了以下内容

<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>

---

我在JPA中遇到了这个错误，然后我将这一行添加到application.properties：

spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

---

根据这篇文章：

我们最近在一个部署中遇到了同样的问题，因为我们也在使用hibernate，方言为null是一个模糊的错误。 我将was与连接字符串本身一起使用，并进行了以下更改以使其正常工作

connectionUrl:-jdbc：mysql://127.0.0.1:3306/{{dbName}}？serverTimezone=UTC&allowPublicKeyRetrieval=true&useSSL=false

我们是怎么解决的 1） 我们使用JDBC驱动程序运行简单的DB连接，该驱动程序将给出时区异常。 2） 我们发现了时区的问题，必须在连接字符串中添加更多属性，如上所示。 3） 我们还添加了2个其他属性，因为它仍然不起作用

---

方言没有设置是含糊不清的，花了我们很多时间，我希望这有帮助。

这为我增加了方言属性

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
    <persistence-unit name="project_name" transaction-type="RESOURCE_LOCAL">
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="root"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.schema-generation.drop-source" value="script-then-metadata"/>
            <property name="dialect" value="org.hibernate.dialect.MySQLDialect"/>  
        </properties>
    </persistence-unit>
</persistence>

我认为您无法调试xml文件。我已经试过调试实际的java代码，但它始终没有到达，因为它仍在尝试组织Bean及其应用程序上下文Spring和Hibernate也是用“实际的java代码”编写的。stacktrace显示了构建SessionFactory涉及的类和方法。只需在那里设置一些断点就可以找出哪里出了问题？很抱歉，除非将整个lib类项目导入到项目中，否则无法调试libs。像“org.springframework.beans.factory”这样的东西不能通过libs进行调试，当然可以。是的，库的源代码对此很有用。配置良好的IDE/构建工具（如eclipse/maven）将自动下载依赖项的源代码。否则，还可以手动附加源。简言之，在宣布一些不可能的事情之前，请查阅IDE的文档。我在.properties文件中定义了这些属性。这不对吗？另外，数据库连接是在我的一个名为datasourceHibernate的bean上定义的，它使用的属性与您不同（Hibernate使用

connection.url

，您使用的是

database.url

）。您的属性文件可能是针对jdbc还是针对spring的（我不太擅长spring）？。我认为混合使用这两种类型的配置文件是个问题，因为Hibernate只能看到其中的一半。我遵循了spring+hibernate的指南，该指南具有完全相同的设置，并且还阅读了使用数据源bean的spring in action手册

spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
    <persistence-unit name="project_name" transaction-type="RESOURCE_LOCAL">
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="root"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.schema-generation.drop-source" value="script-then-metadata"/>
            <property name="dialect" value="org.hibernate.dialect.MySQLDialect"/>  
        </properties>
    </persistence-unit>
</persistence>