Question

大家好我正试图用hibernate制作小项目我正在使用mysql 这是我的hibernate.cfg.xml文件

<?xml version='1.0' encoding='utf-8'?>
<!--
  ~ Hibernate, Relational Persistence for Idiomatic Java
  ~
  ~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.
  ~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
  -->
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <!-- <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
                    <property name="connection.url">jdbc:hsqldb:hsql://localhost/TestDB</property> -->

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

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">
            org.hibernate.dialect.MySQLDialect
        </property>

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

        <property name="cache.use_query_cache">true</property>
        <property name="cache.use_second_level_cache">true</property>
        <property name="cache.use_structured_entries">true</property>
        <property name="cache.region.factory_class">org.hibernate.cache.jcache.JCacheRegionFactory</property>
        <property name="net.sf.ehcache.configurationResourceName">/hibernate-config/ehcache.xml</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <mapping resource="hibernate-config/domain/Event.hbm.xml"/>
        <mapping resource="hibernate-config/domain/Person.hbm.xml"/>
        <mapping resource="hibernate-config/domain/PhoneNumber.hbm.xml"/>
        <mapping resource="hibernate-config/domain/Account.hbm.xml"/>
        <mapping resource="hibernate-config/domain/HolidayCalendar.hbm.xml"/>

        <mapping resource="hibernate-config/domain/Item.hbm.xml"/>
<mapping class="com.hamada.hibernate.dto.UserDetails"></mapping>
    </session-factory>

</hibernate-configuration>

和此UserDetails.java文件

package com.hamada.hibernate.dto;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class UserDetails {

    @Id
    private int userId;
    private String userName;

    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }
}

这也是我的主要课程

package com.hamada.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import com.hamada.hibernate.dto.UserDetails;

public class HibernateTest {

    public static void main(String[] args) {
        UserDetails user=new UserDetails();
        user.setUserId(1);
        user.setUserName("Ahmed");
        SessionFactory sessionFactory=new Configuration().configure().buildSessionFactory();
        Session session=sessionFactory.openSession();   
        session.beginTransaction();
        session.save(user);
        session.getTransaction().commit();
    }

}

当我运行程序时出现此错误

Jun 08, 2016 2:17:06 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.0.Final}
Jun 08, 2016 2:17:06 AM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Jun 08, 2016 2:17:06 AM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist

Exception in thread "main" org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.cache.spi.RegionFactory]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:244)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:208)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
    at org.hibernate.boot.internal.MetadataBuilderImpl$MetadataBuildingOptionsImpl.<init>(MetadataBuilderImpl.java:663)
    at org.hibernate.boot.internal.MetadataBuilderImpl.<init>(MetadataBuilderImpl.java:127)
    at org.hibernate.boot.MetadataSources.getMetadataBuilder(MetadataSources.java:135)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:654)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:723)
    at com.hamada.hibernate.HibernateTest.main(HibernateTest.java:15)
Caused by: org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable to resolve name [org.hibernate.cache.jcache.JCacheRegionFactory] as strategy [org.hibernate.cache.spi.RegionFactory]
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:126)
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:194)
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:161)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:67)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:28)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:234)
    ... 8 more

Answer 1

JCacheRegionFactory是hibernate-jcache模块的一部分，它不是hibernate-core的一部分，你需要将它包含在你的classpath / maven / gradle config中

Answer 2

在你的hibernate.cfg.xml中，我看到你已经包含了一些与缓存相关的属性，即

<property name="cache.use_query_cache">true</property>
<property name="cache.use_second_level_cache">true</property>
<property name="cache.use_structured_entries">true</property>
<property name="cache.region.factory_class">org.hibernate.cache.jcache.JCacheRegionFactory</property>
<property name="net.sf.ehcache.configurationResourceName">/hibernate-config/ehcache.xml</property>

根据您的问题，我了解您要测试一个简单的Hibernate演示项目，如果您不需要任何缓存功能，则可以注释掉上面提到的代码块。这样您就不会再次收到错误，因为在这段代码中您已经包含了JCacheRegionFactory，并且在您使用的jar中没有。 [这里我假设您已经将jars存在于您可能已下载的hibernate版本压缩文件所需的文件夹中。]

以防万一，您需要包含缓存代码，然后正如@Arthur已经提到的那样，您需要包含相关文件。作为初学者，我可以建议在你的hibernate发行版本文件夹中，你去路径项目/ hibernate-jcache。有一个名为hibernate-jcache.gradle的文件。也许，你可以尝试在项目中包含它，看看错误是否会停止。

Answer 3

谢谢你们，问题解决了。我创建的问题是应用程序无法识别hibernate xml文件，然后我直接将它放在src文件夹中，之后它正在工作

定义hibernate xml文件时出错

3 个答案: