具有多个数据源的StandAlone GORM不起作用

Question

我有一个基于grails 2.0的独立GORM应用程序，可以处理单个数据源的NO问题。在我引入另一个gorm：sessionFactory引用第二个数据源的那一刻，应用程序失败了。详情如下。

spring应用程序上下文代码供参考：

`

<bean id="dataSource_aaa" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="url" value="jdbc:mysql://localhost/aaa" />
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
</bean>

<bean id="aaaMessageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="messages" />
</bean>

<!-- Single gorm session factory works, either one, but both together fail -->    
<gorm:sessionFactory base-package="com.aaa.entity"
        data-source-ref="dataSource_aaa" 
        message-source-ref="aaaMessageSource">
        <property name="hibernateProperties">
            <util:map>
                <entry key="hibernate.hbm2ddl.auto" value="update" />
                <entry key="hibernate.connection.autocommit" value="false" />
                <entry key="hibernate.show_sql" value="false" />
            </util:map>
        </property>
</gorm:sessionFactory>


<bean id="dataSource_bbb" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="url" value="jdbc:mysql://localhost/bbb" />
...
</bean>

<bean id="bbbMessageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="messages" />
</bean>

<!-- Single gorm session factory works, either one, but both together fail -->    
<gorm:sessionFactory base-package="com.bbb.entity"
        data-source-ref="dataSource_bbb" 
        message-source-ref="bbbMessageSource">
    <property name="hibernateProperties">
    <util:map>
        <entry key="hibernate.hbm2ddl.auto" value="create-drop" />
        <entry key="hibernate.connection.autocommit" value="false" />
        <entry key="hibernate.show_sql" value="false" />
    </util:map>
    </property>
</gorm:sessionFactory>

`

应用程序尝试初始化spring bean容器，但请注意bean被覆盖为：

2013-12-04 16:21:20,091 INFO   XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [spring/application-context.xml]
2013-12-04 16:21:20,323 INFO   XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [spring/application-beans.xml]
2013-12-04 16:21:20,345 INFO   XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [spring/application-config.xml]
2013-12-04 16:21:20,778 INFO   DefaultListableBeanFactory - Overriding bean definition for bean 'grailsApplication': replacing [Generic bean: class [org.codehaus.groovy.grails.commons.DefaultGrailsApplication]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=initialise; destroyMethodName=null] with [Generic bean: class [org.codehaus.groovy.grails.commons.DefaultGrailsApplication]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=initialise; destroyMethodName=null]
2013-12-04 16:21:20,779 INFO   DefaultListableBeanFactory - Overriding bean definition for bean 'gormEnhancingPostProcessor': replacing [Generic bean: class [org.codehaus.groovy.grails.orm.hibernate.cfg.GORMEnhancingBeanPostProcessor]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Generic bean: class [org.codehaus.groovy.grails.orm.hibernate.cfg.GORMEnhancingBeanPostProcessor]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
2013-12-04 16:21:20,779 INFO   DefaultListableBeanFactory - Overriding bean definition for bean 'transactionManager': replacing [Generic bean: class [org.codehaus.groovy.grails.orm.hibernate.GrailsHibernateTransactionManager]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Generic bean: class [org.codehaus.groovy.grails.orm.hibernate.GrailsHibernateTransactionManager]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
2013-12-04 16:21:21,033 INFO   ClassPathXmlApplicationContext - Bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0' of type [class org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2013-12-04 16:21:21,035 INFO   ClassPathXmlApplicationContext - Bean 'org.springframework.transaction.config.internalTransactionAdvisor' of type [class org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2013-12-04 16:21:21,047 INFO   DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@69f674: defining beans 

然后因例外而失败：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.aaa.entity.CategoryValidator': Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'domainClass' threw exception; nested exception is java.lang.NullPointerException
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1423)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1128)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
        at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)
        at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)
        at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:57)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:182)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:190)
        at App.main(App.groovy:15)
Caused by: org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property 'domainClass' threw exception; nested exception is java.lang.NullPointerException
        at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:101)
        at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:57)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1420)
        ... 22 more

我怀疑问题在于没有命名空间通过Gorm通过两个sessionFactories创建的bean：http://grepcode.com/file/repo1.maven.org/maven2/org.grails/grails-hibernate/2.1.1/org/codehaus/groovy/grails/orm/hibernate/cfg/GORMSessionFactoryDefinitionParser.java?av=f

这似乎也在Grails错误列表中引用，但不相信有一个有效的解决方案：http://jira.grails.org/browse/GRAILS-4507

有没有人在使用多个数据源的独立GORM应用程序方面取得了成功？ 任何和所有的帮助都能让我前进。

更新的 在绝望中，我终于创建了3个不同的spring应用程序上下文。一个用于两个gorm sessionFactories，一个用于处理这些数据源的应用程序业务逻辑进行编组。这项工作具有明显的局限性，即无法跨越数据源跨越事务操作。还会添加一些代码噪音，我会尝试清理。

如果有人有更好的建议，那么，我更喜欢比这更清洁的解决方案。