我正在使用 Spring (4.2.6.RELEASE) 和 Hibernate(5.1.0.Final)。在 spring.xml 中定义为 bean 的 Hibernate 属性。
我为二级缓存库添加了ehcache。我收到错误net.sf.ehcache.ObjectExistsException：默认缓存已在以下项目中配置。
有人帮忙吗？
***************************** applicationContext-dao.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="databaseProperties" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="file:///C:/Config/database.properties"/>
</bean>
<bean id="transactionDatasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="${db.url}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
</bean>
<!-- Hibernate 4 SessionFactory Bean definition -->
<bean id="hibernate4AnnotatedSessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="transactionDatasource" />
<property name="annotatedClasses">
<list>
<value>com.company.model.db.ApplicationStatEntity</value>
<value>com.company.DeviceCapEntity</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.current_session_context_class">thread</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.jdbc.batch_size">50</prop>
<prop key="hibernate.connection.url">jdbc:oracle:thin:@<IP>:1522/rac2</prop>
<prop key="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
<prop key="org.hibernate.cache.ehcache.configurationResourceName">/ehcache.xml</prop>
<!--property name="net.sf.ehcache.configurationResourceName">/ehcache.xml</property-->
</props>
</property>
</bean>
</beans>
我实现了以下 GenericDao 类。此类将实体视为通用的。
***************************** GenericDao ******************** **
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Logger;
import org.hibernate.*;
import org.hibernate.hql.internal.ast.QuerySyntaxException;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.Iterator;
import java.util.List;
public class GenericDaoImpl<GenericEntity> implements GenericDao<GenericEntity> {
private Class<GenericEntity> type;
private ClassPathXmlApplicationContext context = null;
protected SessionFactory sessionFactory = null;
Logger log = Logger.getLogger(GenericDaoImpl.class.getName());
public GenericDaoImpl() {
context = getApplicationContext();
sessionFactory = getSessionFactory();
}
private ClassPathXmlApplicationContext getApplicationContext() {
if (this.context == null) {
this.context = new ClassPathXmlApplicationContext("applicationContext-dao.xml");
}
return this.context;
}
private SessionFactory getSessionFactory() {
if(this.sessionFactory==null) {
this.sessionFactory = (SessionFactory) getApplicationContext().getBean("hibernate4AnnotatedSessionFactory");
}
return this.sessionFactory;
}
public Class<GenericEntity> getMyType() {
return this.type;
}
public void setType(Class<GenericEntity> type) {
this.type = type;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public void insert(GenericEntity genericEntity) throws DaoException {
Session session = this.sessionFactory.openSession();
Transaction transaction = null;
try {
transaction = session.beginTransaction();
log.info("[GeneicDaoImpl.insert] hibernate session opened");
session.save(genericEntity);
log.info("[GeneicDaoImpl.insert] insertion done");
transaction.commit();
} catch (QuerySyntaxException e) {
if (transaction != null) {
transaction.rollback();
log.error(
"[GeneicDaoImpl.insert] An error occured ID generation with table mapping. "
+ "Check schema,table name in entity object or check table in database",
e);
throw new DaoException("[GeneicDaoImpl.insert] hibernate error occured,rollback done. Stack Trace : /n" + e.getStackTrace());
}
} catch (AnnotationException e) {
if (transaction != null) {
transaction.rollback();
log.error("[GeneicDaoImpl.insert] An error occured ID generation with sequence. Check sequence name in entity object and in database",
e);
throw new DaoException("[GeneicDaoImpl.insert] hibernate error occured,rollback done. Stack Trace : /n" + e.getStackTrace());
}
} catch (Exception e) {
if (transaction != null) {
transaction.rollback();
log.error("[GeneicDaoImpl.insert] hibernate error occured,rollback done", e);
throw new DaoException("[GeneicDaoImpl.insert] hibernate error occured,rollback done. Stack Trace : /n" + e.getStackTrace());
}
} finally {
session.close();
}
}
}
在 Junit 测试类中，我这样调用插入批处理。
****************************** TestClass.java ********************* ********
public class TestClass {
@Test
public void insertTest() {
GenericDao<ApplicationStatEntity> insertBatchDao = new GenericDaoImpl();
ApplicationStatEntity applicationStatEntity = new ApplicationStatEntity();
applicationStatEntity.setId(102);
applicationStatEntity.setDeviceid("SamsungShitty");
try {
insertBatchDao.insert(applicationStatEntity);
} catch (DaoException e) {
e.printStackTrace();
}
}
}
***************************** ehcache.xml ****************** ****
<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
<diskStore path="java.io.tmpdir/ehcache" />
<defaultCache maxEntriesLocalHeap="10000" eternal="false"
timeToIdleSeconds="120" timeToLiveSeconds="120" diskSpoolBufferSizeMB="30"
maxEntriesLocalDisk="10000000" diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU" statistics="true">
<persistence strategy="localTempSwap" />
</defaultCache>
</ehcache>