Question

首先，让我开始，我已经看了很多关于在Grails上配置多个数据源的“正确”方法的网站，其中每一个（Grails 2.0及更高版本）都指向 docs ，但是之后按照文档的说法我得到了这个错误：

Error 2014-03-29 15:48:29,219 [localhost-startStop-1] ERROR context.GrailsContextLoader      - Error initializing the application: Error creating bean with name 'transactionManager_lookup': Cannot resolve reference to bean 'sessionFactory_lookup' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory_lookup': Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean '$primaryTransactionManager' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '$primaryTransactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'transactionManager': Requested bean is currently in creation: Is there an unresolvable circular reference?
Message: Error creating bean with name 'transactionManager_lookup': Cannot resolve reference to bean 'sessionFactory_lookup' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory_lookup': Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean '$primaryTransactionManager' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '$primaryTransactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'transactionManager' while setting bean property 'transactionManager'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'transactionManager': Requested bean is currently in creation: Is there an unresolvable   circular reference?

我觉得最有趣的是，如果我指定：

dataSource_lookup

我会得到：

Error initializing the application: Error creating bean with name     'transactionManager_lookup'

如果我将其更改为：

dataSource_mysqldb

我明白了：

Error initializing the application: Error creating bean with name 'transactionManager_mysqldb'

如果我没有指定第二个数据源，那么一切正常。

我的代码：

dataSource {
 logSql = true
 pooled = true
 dialect = org.hibernate.dialect.MySQLInnoDBDialect
 driverClassName = 'com.mysql.jdbc.Driver'
 username = 'myuser'
 password = 'mypass'
 url = 'jdbc:mysql://localhost/mydatabase'
 dbCreate = 'update'
}

dataSource_mysql {
 dialect = org.hibernate.dialect.MySQLInnoDBDialect
 driverClassName = 'com.mysql.jdbc.Driver'
 username = 'myuser'
 password = 'mypass'
 url = 'jdbc:mysql://localhost/mydatabase'
 dbCreate = 'update'
}

dataSource_oracle {
 dialect = org.hibernate.dialect.Oracle10gDialect
 driverClassName = 'oracle.jdbc.driver.OracleDriver'
 username = 'myuser'
 password = 'mypass'
 url = 'jdbc:oracle:thin:@localhost:1521:mydatabase'
 dbCreate = 'update'
}

我在这里做错了什么？（如前所述，如果我删除了两个辅助dataSources（dataSource_mysql和dataSource_oracle），一切正常）。

提前致谢。 Dev：Ubuntu - Grails 2.3.7 - MySQL - Oracle 11g。

Answer 1

好的，我想出来了。

在Grails 2.3.7发行说明中，它说升级你的hibernate版本。我做不到。

http://grails.org/2.3.7+Release+Notes

runtime ':hibernate:3.6.10.10'

然后，在我这样做之后，我停止了这个错误并得到了另一个错误

java.lang.ClassNotFoundException: null at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at ....MigrationUtils.createInstance(MigrationUtils.groovy:220) at ....MigrationUtils.getDatabase(MigrationUtils.groovy:57) at ....MigrationUtils.getDatabase(MigrationUtils.groovy:116) at DbmGenerateGormChangelog$_...doCall(DbmGenerateGormChangelog:52) at ....MigrationUtils.executeInSession(MigrationUtils.groovy:132) at DbmGenerateGormChangelog$_run_closure2.doCall(DbmGenerateGormChangelog:51) at DbmGenerateGormChangelog$_run_closure1.doCall(DbmGenerateGormChangelog:33)

我以前从未必须为oracle指定hibernate方言，但显然在最新版本的迁移插件（当前为1.3.8）中，你必须这样做。

dialect = "org.hibernate.dialect.Oracle10gDialect"

我已经指定了MySQL的方言，所以我不知道如果删除它会产生相同的错误。

Grails - 多个数据源

1 个答案: