spring-server.xml中的一个entityManagerFactory。
但我必须再生成一个entityManager，我用
做Persistence.createEntityManagerFactory("myotherpersistenceunitname");
但我得到例外
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>
答案 0 :(得分：1)
问题here描述并在the source中修复但未正确使用EhCache单例。答案取决于spring-context-support的哪个版本以及您正在使用的EhCache版本。对于两者，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：
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
p:shared="true"
p:config-location="classpath:ehcache.xml"/>
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
p:shared="false"
P:acceptExisting="true"
p:config-location="classpath:ehcache.xml"/>
答案 1 :(得分：0)
尝试在ehcache.xml
中以不同方式命名两个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">