2

spring-server.xml 中有一个 entityManagerFactory。

但我必须再生成一个 entityManager，我用

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)

春天.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>
4

2 回答 2

2

此处描述并在源代码中修复的问题是未正确使用 EhCache 单例。答案取决于spring-context-support您使用的 EhCache 版本和版本。对于这两者，您需要使用EhCache 2.6 或更高版本：

<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"/>
于 2014-08-04T17:58:51.737 回答
0

尝试在 ehcache.xml 中以不同的方式命名两个缓存管理器

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

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    name="ehCacheManager2">
于 2014-09-18T20:37:16.873 回答