26

在使用 spring3 设置休眠时遇到更多问题。这次它说连接是 nul，因为我的 hibernate.cfg.xml 文件中没有设置方言。

这是完整的例外：

    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

这是我设置 sessionfactory 的 dataSource-config.xml

    <?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>

下面是hibernate.cfg.xml文件

 <?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- JDBC connection settings -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/freedom</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">password</property>

        <!-- JDBC connection pool, use Hibernate internal connection pool -->
        <property name="connection.pool_size">25</property>

        <!-- Defines the SQL dialect used in Hiberante's application -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Display and format all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>

        <!-- Mapping to hibernate mapping files -->
        <!--mapping resource="org/kodejava/example/hibernate/app/Label.hbm.xml"/-->
    </session-factory>
</hibernate-configuration>

如您所见，方言正在设置中。

编辑：我的 database.properties 文件

    # DB properties file

database.url=jdbc:mysql://localhost:3306/freedom
database.driver=com.mysql.jdbc.Driver
database.user=root
database.password=password
database.maxConnections=25

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

   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]
4

16 回答 16

10

缺少数据库连接。在 hibernate.cfg.xml 文件中添加这样的行

<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>

your_（如果您的计算机上未安装数据库，请替换 localhost，并在我的示例中设置以开头的值）。

于 2012-06-26T16:23:46.097 回答
6

I had this error with JPA, then I just added this line to application.properties:

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

based on this post: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

于 2020-05-20T19:08:29.283 回答
2

我有同样的问题。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>

对 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>

让我的问题消失了。也许有人可以解释为什么，我很高兴它有效，并想分享我所知道的一点：）

于 2013-03-04T14:31:18.627 回答
2

我认为这是未hibernate.cfg.xml在应用程序中加载文件的问题。

我也遇到了同样的问题。我在我的项目中尝试了以下代码：

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

然后它工作得很好。希望这会有所帮助。

于 2016-01-21T10:51:39.657 回答
1

我你正在使用休眠，InnoDB你为什么不设置hibernate.dialecttoorg.hibernate.dialect.MySQL5或 org.hibernate.dialect.MySQL.

和 的连接属性hibernate.connection.url。

于 2012-06-28T09:22:09.333 回答
1

我认为你datasource-config.xml不在类路径中

而不是有这个文件WEB-INF/datasource-config.xml

将其复制到WEB-INF/classes/datasource-config.xml

于 2012-06-27T05:57:06.363 回答
1

我认为您没有配置hibernate.cfg.xml。

Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
SessionFactory factory = configuration.buildSessionFactory();
于 2013-08-30T09:22:15.053 回答
1

在 persistence.xml 文件中添加了以下内容，

<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
于 2019-04-17T13:36:10.777 回答
1

如果您的 mysql-connector 版本和 mysql-installer 版本不同，则会出现此问题。

在内部它会抛出原因：

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

所以你需要使你的 mysql-connector 版本和 mysql-installer 版本相同......

于 2018-11-25T10:49:35.647 回答
0

您没有发布会话工厂初始化代码。但我想这与这个问题相同

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);

请仔细检查您的代码。

于 2014-03-01T11:59:44.233 回答
0

我遇到了同样的问题，问题是我的计算机没有输入到 postgres 数据库的 pg_hba.conf 中，该数据库允许允许哪些客户端（IP 地址）与数据库交谈。

顺便说一句：其他用户告诉他们，如果他们只是忘记在本地启动数据库服务，也会引发错误

于 2016-11-15T13:04:09.353 回答
0

我认为在创建配置对象后卸载 hibernate.cfg.xml 文件会导致错误，如下所示：

Configuration config = new Configuration();
config.configure("hibernate.cfg.xml");
于 2016-07-07T07:00:45.283 回答
0

我认为您不会像下面那样创建配置。

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

最好的

于 2015-11-26T15:30:41.907 回答
0

我们最近在我们的一个部署中遇到了同样的问题，因为我们也在使用休眠，而 dialect is null 是一个模糊的错误。我使用的是连接字符串本身，并进行了以下更改以使其工作

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

我们如何解决它的步骤 1）我们使用 JDBC 驱动程序运行简单的 DB 连接，这将给出时区异常。2）我们发现了时区问题，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，因为它仍然无法正常工作。

方言未设置模糊占用了我们很多时间，我希望这会有所帮助。

于 2020-05-24T02:32:24.913 回答
0

这对我有用，添加了方言属性...

<?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>
于 2021-02-15T06:05:39.560 回答
0

单独创建ServiceRegistry实例并将其传递给buildSessionFactory可能会导致此错误。尝试SessionFactory如下创建实例：

private static SessionFactory factory;
factory = cfg.buildSessionFactory(
          new ServiceRegistryBuilder().applySettings(cfg.getProperties())
         .buildServiceRegistry());
于 2016-01-14T06:30:44.517 回答