hi: i have an appliaction on jboss.this applcation use oracle rac. in a simple jdbc application i use OracleDataSource object to realize the oracle rac fast failover.i could set OracleDataSource object's method setConnectionCacheProperties,setFastConnectionFailoverEnabled, setONSConfiguration,setConnectionCachingEnabled . when this application startup,i shutdown a oracle rac node that the application connect to it.then the jdbc connection auto change the other. now i 'm going to deploy this application jboss,how could i do to config a jca config file. thanks!!!