Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
localhost:1521:orcl
TNS:listener 这个东西配置错了!
或者 oracle 的 listener 服务没启动吧！ 检查下试试