Java 为什么我在Hibernate中出错?
我正在尝试在Hibernate中构建我的简单应用程序 我正在使用mysql数据库 我已经编译了所有类,并使用命令提示符运行Test(包含main方法)类Java 为什么我在Hibernate中出错?,java,hibernate,Java,Hibernate,我正在尝试在Hibernate中构建我的简单应用程序 我正在使用mysql数据库 我已经编译了所有类,并使用命令提示符运行Test(包含main方法)类 log4j:WARN No appenders could be found for logger (org.jboss.logging). log4j:WARN Please initialize the log4j system properly. Exception in thread "main" org.hibernate.servi
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.service.spi.ServiceException: Unable to
create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createServ
ice(AbstractServiceRegistryImpl.java:244)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initialize
Service(AbstractServiceRegistryImpl.java:208)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService
(AbstractServiceRegistryImpl.java:189)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcSer
vicesImpl.java:51)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.conf
igureService(StandardServiceRegistryImpl.java:94)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initialize
Service(AbstractServiceRegistryImpl.java:217)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService
(AbstractServiceRegistryImpl.java:189)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTy
pes(MetadataBuildingProcess.java:352)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete
(MetadataBuildingProcess.java:111)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(Me
tadataBuildingProcess.java:83)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilder
Impl.java:418)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilder
Impl.java:87)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav
a:692)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav
a:724)
at Test.main(Test.java:14)
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: U
nable to load class [com.mysql.jdbc.Driver]
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceI
mpl.classForName(ClassLoaderServiceImpl.java:229)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectio
nProviderImpl.loadDriverIfPossible(DriverManagerConnectionProviderImpl.java:161)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectio
nProviderImpl.buildCreator(DriverManagerConnectionProviderImpl.java:117)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectio
nProviderImpl.configure(DriverManagerConnectionProviderImpl.java:73)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.conf
igureService(StandardServiceRegistryImpl.java:94)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initialize
Service(AbstractServiceRegistryImpl.java:217)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService
(AbstractServiceRegistryImpl.java:189)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.build
JdbcConnectionAccess(JdbcEnvironmentInitiator.java:145)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initi
ateService(JdbcEnvironmentInitiator.java:66)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initi
ateService(JdbcEnvironmentInitiator.java:35)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.init
iateService(StandardServiceRegistryImpl.java:88)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createServ
ice(AbstractServiceRegistryImpl.java:234)
... 14 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : co
m.mysql.jdbc.Driver
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceI
mpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:217)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceI
mpl.classForName(ClassLoaderServiceImpl.java:226)
... 25 more
更新
com.mysql.jdbc.Driver
jdbc:mysql://localhost/hibernate
根
org.hibernate.dialogue.mysqldialogue
真的
这与hibernate配置错误有关吗?您会得到一个
ClassNotFoundException
com.mysql.jdbc.Driver
,您需要将mysql驱动程序jar添加到构建路径。您会得到一个ClassNotFoundException
com.mysql.jdbc.Driver
,您需要将mysql驱动程序jar添加到构建路径。您必须在项目上添加mysql驱动程序jar。
如果您使用的是maven,只需在pom文件中添加依赖项:
<?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>
<property name="hbm2ddl.auto">update</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<mapping resource="student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
mysql
mysql连接器java
5.1.38
如果没有,请从mysql.com网站下载并安装jar。您必须在项目中添加mysql驱动程序jar。 如果您使用的是maven,只需在pom文件中添加依赖项:
<?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>
<property name="hbm2ddl.auto">update</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<mapping resource="student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
mysql
mysql连接器java
5.1.38
如果没有,请从mysql.com网站下载并安装jar