java - 错误：org.hibernate.util.JDBCExceptionReporter - 无法加载 JDBC 驱动程序类“com.mysql.jdbcDriver”

Question

我正在尝试使用 Spring 和 Hibernate 以及 MySQL 数据库配置 Java MVC webapp，但是当我运行服务器时出现此错误，我不知道问题出在哪里。

WARN : org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null
ERROR: org.hibernate.util.JDBCExceptionReporter - Cannot load JDBC driver class 'com.mysql.jdbcDriver'
WARN : org.hibernate.cfg.SettingsFactory - Could not obtain connection to query metadata
org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbcDriver'
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1136)
    at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
    at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:114)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2163)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2159)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1383)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:860)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:779)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
    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$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:546)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:872)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbcDriver
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1713)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1130)
    ... 33 more
ERROR: org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/spring/applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection available
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1412)
    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$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:546)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:872)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection available
    at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:107)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:138)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2163)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2159)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1383)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:860)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:779)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
    ... 22 more
jul 28, 2013 12:26:19 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Excepción enviando evento inicializado de contexto a instancia de escuchador de clase org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/spring/applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection available
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1412)
    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$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:546)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:872)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection available
    at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:107)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:138)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2163)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2159)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1383)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:860)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:779)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
    ... 22 more

我不知道错误可能出在哪里。这是我的 applicationContext.xml。错误似乎在 dataSource bean 中。

<?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:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    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">


    <!-- holding properties for database connectivity /-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- enabling annotation driven configuration /-->
    <context:annotation-config/>

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

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="com.companyname.springapp.repository" />
    <context:component-scan base-package="com.companyname.springapp.service" />

</beans>

这是我的 jdbc.properties

hibernate.generate_statistics = true
hibernate.show_sql = true

jdbc.driverClassName=com.mysql.jdbcDriver
jdbc.url=jdbc:mysql://localhost:3306/baseDeDatos
jdbc.username=miUsuario
jdbc.password=miContrasena
hibernate.dialect=org.hibernate.dialect.MySQLDialect

我有所有这些 jar 来加载类。其中一些（如 jpa-api.jar）我认为这不是必需的，其他的会重复，但我在其他项目中拥有它，我开始制作它，我还没有删除它：

activation-1.1.jar
antlr-2.7.7.jar
aopalliance-1.0.jar
c3p0-0.9.1.jar
commons-logging-1.1.1.jar
commons-pool-1.6.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-3.2.0.Final.jar
hibernate-commons-annotations-4.0.1.Final.jar
hibernate-core-3.5.3-Final.jar
hibernate-core-4.1.8.Final.jar
hibernate-entitymanager-4.1.8.Final.jar
hibernate-jpa-2.0-api-1.0.1.Final.jar
hibernate-validator-4.0.2.GA.jar
hibernate3.jar
javassist-3.15.0-GA.jar
javax.mail.jar
jaxb-api-2.1.jar
jaxb-impl-2.1.3.jar
jboss-logging-3.1.0.GA.jar
jboss-transaction-api_1.1_spec-1.0.0.Final.jar
jpa-api-2.0-cr-1.jar
jstl-1.2.jar
junit-4.8.1.jar
log4j-1.2.14.jar
mysql-connector-java-5.1.25.jar
mysql-connector-java-5.1.6.jar
org.apache.commons.dbcp.jar
org.springframework.orm.jar
postgresql-8.4-701.jdbc4.jar
servlet-api-2.5.jar
slf4j-api-1.5.11.jar
slf4j-api-1.6.1.jar
slf4j-log4j12-1.5.11.jar
spring-aop-3.0.2.RELEASE.jar
spring-asm-3.0.2.RELEASE.jar
spring-beans-3.0.2.RELEASE.jar
spring-context-3.0.2.RELEASE.jar
spring-context-support-3.0.2.RELEASE.jar
spring-core-3.0.2.RELEASE.jar
spring-expression-3.0.2.RELEASE.jar
spring-jdbc-3.0.2.RELEASE.jar
spring-orm-3.0.2.RELEASE.jar
spring-tx-3.0.2.RELEASE.jar
spring-web-3.0.2.RELEASE.jar
spring-webmvc-3.0.2.RELEASE.jar
stax-api-1.0-2.jar
validation-api-1.0.0.GA.jar

有人可以帮我解决这个问题吗？我使用 Tomcat 7 在 Eclipse 中运行它。

谢谢！

Answer 1

您在此处输入了错误的驱动程序名称：

jdbc.driverClassName=com.mysql.jdbcDriver

它应该是：

jdbc.driverClassName=com.mysql.jdbc.Driver

注意和.之间。jdbcDriver

诊断类似事情的方法是查看它找不到的类：

Cannot load JDBC driver class 'com.mysql.jdbcDriver'

这看起来已经很可疑了，因为该名称jdbcDriver不遵循 Java 命名约定。因此，此时您再仔细检查它应该是什么 - 例如通过查看 jar 文件 - 并修复配置。

正如评论中所指出的，我认为在类路径上拥有同一个 jar 文件的多个版本并不是一个好主意——我看不出这个结局很好。

Answer 2

我遇到了这个问题，结果是我的 .properties 文件在 driverClassName 值的末尾有一对“\t\t”。但是当错误打印出来时，它没有显示选项卡。当我经历了漫长的调试跋涉时，我最终发现了这一点。

因此，如果有人在 SO 上发现了这个并且您遇到了上述问题，请检查您的 .prop 文件，确保值的末尾没有奇怪的东西。