SPRING多数据源切换的问题和解决方法

在应用中，需要热切换数据源。但发现如下问题： 

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name  'swappable'  defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is  null
 java.lang.IllegalArgumentException: Superclass has no null  constructors but no arguments were given

配置如下 

  "myDataSource1"   class = "org.springframework.jndi.JndiObjectFactoryBean" >
     "jndiName" >
         java:/ds1



 "myDataSource2"   class = "org.springframework.jndi.JndiObjectFactoryBean" >
     "jndiName" >
         java:/ds2




 "myTransactionManager"   class = "org.springframework.transaction.jta.JtaTransactionManager" >

     "userTransactionName" >
         UserTransaction


     "transactionManagerName" >
         java:/TransactionManager




 "swappableDataSource"
       class = "org.springframework.aop.target.HotSwappableTargetSource" >

         "myDataSource1" />



 "swappable"
       class = "org.springframework.aop.framework.ProxyFactoryBean" >
     "targetSource" >
         "swappableDataSource" />


 "mySessionFactory1"   class = "org.springframework.orm.hibernate3.LocalSessionFactoryBean" >
     "mappingResources" >

             test/po/impl/Cus.hbm.xml


     "hibernateProperties" >

             "hibernate.dialect" > ${hibernate.dialect}
             "hibernate.show_sql" > true
             "hibernate.generate_statistics" > true
             "hibernate.cache.provider_class" >
             org.hibernate.cache.EhCacheProvider


     "dataSource" >
         "swappable" />

这里的数据源是用应用服务器JNDI提供的，如果用自己的就没有问题。  

  "dataSource1"   class = "org.springframework.jdbc.datasource.DriverManagerDataSource" >
     "driverClassName"  value= "${jdbc.driverClassName}" />
     "url"  value= "${jdbc.url1}" />
     "username"  value= "${jdbc.username}" />
     "password"  value= "${jdbc.password}" />

用应用服务器的JNDI就会出现上面的错误

 

解决方法---------代理为javax.jdbc.DataSource接口就可以了。