使用 Grails 3.1.5 和 Postgresql 的多个数据源答案

【问题标题】：Multiple datasources with Grails 3.1.5 and Postgresql使用 Grails 3.1.5 和 Postgresql 的多个数据源
【发布时间】：2016-11-21 18:19:55
【问题描述】：

我正在尝试从一个 Grails 3.1.5 应用程序连接到两个 postgresql 数据库，我的 application.yml 如下所示：

hibernate:
    cache:
        queries: false
        use_second_level_cache: true
        use_query_cache: false
        region.factory_class: org.hibernate.cache.ehcache.EhCacheRegionFactory
dataSources:
    dataSource:
        pooled: true
        jmxExport: true
        driverClassName: org.postgresql.Driver
        username: username
        password: password
        dialect: net.kaleidos.hibernate.PostgresqlExtensionsDialect
    dataSource_two:
        pooled: true
        jmxExport: true
        driverClassName: org.postgresql.Driver
        username: username
        password: password
        dialect: net.kaleidos.hibernate.PostgresqlExtensionsDialect
environments:
    development:
        dataSources:
            dataSource:
                dbCreate: update
                url: jdbc:postgresql://localhost:5432/dbone
            dataSource_two:
                dbCreate: update
                url: jdbc:postgresql://localhost:5432/dbtwo
    test:
        dataSource:
            dbCreate: update
            url: jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
    production:
        dataSource:
            dbCreate: update
            url: jdbc:h2:./prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE

我收到此错误，无法启动应用程序

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'transactionManager_dataSource_two' while setting constructor argument with key [1]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager_dataSource_two': Cannot resolve reference to bean 'sessionFactory_dataSource_two' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory_dataSource_two': Invocation of init method failed; nested exception is org.hibernate.cache.NoCacheRegionFactoryAvailableException: Second-level cache is used in the application, but property hibernate.cache.region.factory_class is not given; please either disable second level cache or set correct region factory using the hibernate.cache.region.factory_class setting and make sure the second level cache provider (hibernate-infinispan, e.g.) is available on the classpath.
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:382)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:157)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:634)
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:140)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1143)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1046)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.grails.transaction.TransactionManagerPostProcessor.initialize(TransactionManagerPostProcessor.java:75)
    at org.grails.transaction.TransactionManagerPostProcessor.setBeanFactory(TransactionManagerPostProcessor.java:53)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeAwareMethods(AbstractAutowireCapableBeanFactory.java:1597)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1565)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    ... 20 common frames omitted

看起来 grails 找不到 hibernate.cache.region.factory_class 但正如您所见，我在 application.yml 中有该属性。我还检查了类是否存在于类路径中，并且确实存在。任何想法为什么我会收到此错误？

【问题讨论】：

只是为了确定，您使用的是哪个休眠版本？休眠 4？

标签： postgresql hibernate grails multiple-databases

【解决方案1】：

休眠设置也是特定于数据源的。

所以尝试为您的dataSource_two 添加一个带有休眠设置的hibernate_two 块

【讨论】：

不，没用，我在第一个休眠块之后添加了 hibernate_two 块。我什至尝试在数据源下添加休眠设置。

【解决方案2】：

我将 grails 版本更新为 3.1.9 并使用了完全相同的配置并且它工作正常。我唯一改变的是 'org.hibernate.cache.ehcache.EhCacheRegionFactory' 到 'org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory'。

【讨论】：