具有多个EntityManagerFactory的EhCache CacheManager

Question

在spring-server.xml中有一个entityManagerFactory。

但是我必须再生成一个entityManager，并且我使用

Persistence.createEntityManagerFactory("myotherpersistenceunitname");

但我得到了例外

Caused by: net.sf.ehcache.CacheException: Another unnamed CacheManager already exists in the same VM. Please provide unique names for each CacheManager in the config or do one of following:
1. Use one of the CacheManager.create() static factory methods to reuse same CacheManager with same name or create one if necessary
2. Shutdown the earlier cacheManager before creating new one with same name.
The source of the existing CacheManager is: DefaultConfigurationSource [ ehcache.xml or ehcache-failsafe.xml ]
    at net.sf.ehcache.CacheManager.assertNoCacheManagerExistsWithSameName(CacheManager.java:457)
    at net.sf.ehcache.CacheManager.init(CacheManager.java:354)
    at net.sf.ehcache.CacheManager.<init>(CacheManager.java:242)
    at net.sf.ehcache.hibernate.EhCacheRegionFactory.start(EhCacheRegionFactory.java:70)

spring.xml：

<context:property-placeholder location="classpath:application.properties"/>
    <context:component-scan base-package="merve.web.app" >
     <context:exclude-filter expression="org.springframework.stereotype.Controller" type="annotation" />
    </context:component-scan>
    <context:annotation-config/>
    <tx:annotation-driven transaction-manager="txManager" proxy-target-class="true"  />

    <cache:annotation-driven />


    <bean id="properties" class="merve.web.app.configuration.PropertyResourceConfiguration" />

    <bean id="entityManagerFactory"  
          class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">  
         <property name="persistenceUnitName" value="myPU"/>  
         <property name="dataSource" ref="dataSource" />  
         <property name="jpaVendorAdapter">  
             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">  
                 <property name="databasePlatform" value="${database.target}"/>  
                 <property name="showSql" value="${database.showSql}" />  
             </bean>
         </property>  
    </bean>  

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${database.driver}"/>
        <property name="jdbcUrl" value="${database.url}"/>
        <property name="user" value="${database.username}"/>
        <property name="password" value="${database.password}"/>
        <property name="minPoolSize" value="2"/>
        <property name="maxPoolSize" value="10"/>
        <property name="breakAfterAcquireFailure" value="false"/>
        <property name="acquireRetryAttempts" value="3"/>
        <property name="idleConnectionTestPeriod" value="300" />
        <property name="testConnectionOnCheckout" value="true" />
    </bean>


    <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>



    <bean id="jamesEntityManagerFactory"  
          class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">  
         <property name="persistenceUnitName" value="jamesPU"/>  
         <property name="dataSource" ref="dataSourceJames" />
         <property name="persistenceXmlLocation" value="classpath:META-INF/james-persistence.xml"/> 
         <property name="jpaVendorAdapter">  
             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">  
                 <property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>  
                 <property name="showSql" value="true" />  
             </bean>
         </property>   
    </bean>  



    <bean id="dataSourceJames" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="org.apache.derby.jdbc.EmbeddedDriver"/>
        <property name="jdbcUrl" value="jdbc:derby:../var/store/derby;create=true"/>
        <property name="user" value="app"/>
        <property name="password" value="app"/>
        <property name="minPoolSize" value="2"/>
        <property name="maxPoolSize" value="10"/>
        <property name="breakAfterAcquireFailure" value="false"/>
        <property name="acquireRetryAttempts" value="3"/>
        <property name="idleConnectionTestPeriod" value="300" />
        <property name="testConnectionOnCheckout" value="true" />
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />


     <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">  
        <property name="basenames">  
            <list>
                <value>messages</value>
            </list>
        </property>
    </bean>

    <!-- Ehcache library setup -->
    <bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" p:shared="true" p:config-location="classpath:ehcache.xml"/>

    <bean id="cacheManager"   class="org.springframework.cache.ehcache.EhCacheCacheManager" >
     <property name="cacheManager"><ref local="ehcache"></ref></property>  
    </bean>

<dwr:configuration/>
    <dwr:annotation-scan base-package="tuxi.web.app.service.dwr" scanRemoteProxy="true" scanDataTransferObject="true"/>
    <dwr:url-mapping />

    <dwr:controller id="dwrController"/>

</beans>

Answer 1

在here中描述并在the source中修复的问题是没有正确使用EhCache单例。答案取决于您使用的spring-context-support版本和EhCache版本。对于这两者，您需要使用EhCache 2.6或更高版本的

<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
    <version>2.6.0</version>
</dependency>

接下来，根据您的spring-context-support版本确定要执行的操作：

如果使用Spring 3.1/3.2

<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
    p:shared="true" 
    p:config-location="classpath:ehcache.xml"/>

如果使用Spring 4.x

<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
    p:shared="false"
    P:acceptExisting="true" 
    p:config-location="classpath:ehcache.xml"/>

Answer 2

尝试在ehcache.xml中以不同的方式命名这两个cacheManagers

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    name="ehCacheManager1">

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    name="ehCacheManager2">