我正在尝试使用Hibernate在我的Java EE项目中实现二级缓存.我的Hibernate版本是5.1.0.Final.我在MySQL数据库中创建了一个表雇员.我在我的项目中包含了hibernate-ehcache-4.3.5.Final.jar,但它正在抛出Unable来创建请求的服务[org.hibernate.cache.spi.RegionFactory]错误.这是hibernate.cfg.xml:
<?xml version="1.0" encoding="utf-8"?>
<!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>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/intu</property>
<property name="hibernate.connection.username">****</property>
<property name="hibernate.connection.password">****</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.cache.region.factory_class">net.sf.ehcache.hibernate.EhCacheRegionFactory</property>
<property name="cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="show_sql">false</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="com.dom.Employee"/>
</session-factory>
</hibernate-configuration>
我的员工班:
package com.intu;
import javax.persistence.Entity;
import javax.persistence.Table;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
@Entity
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
@Table(name = "employee")
public class Employee {
private int id;
private String name;
public Employee() {
}
public Employee(String name, float salary) {
super();
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
我的代码:
package com.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import com.intu.Employee;
import com.util.HibernateUtil;
public class Ehcache {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(org.hibernate.Version.getVersionString());
SessionFactory factory = HibernateUtil.getSessionFactory();
Session session1=factory.openSession();
Employee emp1=(Employee)session1.load(Employee.class,121);
System.out.println(emp1.getId()+" "+emp1.getName());
session1.close();
Session session2=factory.openSession();
Employee emp2=(Employee)session2.load(Employee.class,121);
System.out.println(emp2.getId()+" "+emp2.getName());
session2.close();
}
}
错误是
eb 23, 2016 3:10:49 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.1.0.Final}
Feb 23, 2016 3:10:49 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Feb 23, 2016 3:10:49 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Initial SessionFactory creation failed.org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.cache.spi.RegionFactory]
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:20)
at com.util.HibernateUtil.<clinit>(HibernateUtil.java:7)
at com.test.Ehcache.main(Ehcache.java:14)
Caused by: 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:655)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
at com.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:13)
... 2 more
Caused by: org.hibernate.HibernateException: could not instantiate RegionFactory [net.sf.ehcache.hibernate.EhCacheRegionFactory]
at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactor yInitiator.java:84)
at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactor yInitiator.java:29)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:234)
我不确定究竟缺少什么.应该添加什么才能使其正常工作?
解决方法:
您正在使用不兼容的EhCache和Hibernate版本,这会导致初始化问题.如果您使用的是Hibernate 5.1,最好使用相应的ehcache版本:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>5.1.0.Final</version>
</dependency>