Invocation of method 'getInfoCount' in class java.lang.Class threw exception org.apache.ibatis.exceptions.IbatisException: ### Error opening session. Cause: java.sql.SQLException: Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: 202.121.255.20:1521:orcl ### Cause: java.sql.SQLException: Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: 202.121.255.20:1521:orcl at rsc.sfu.edu.cn/ROOT/WEB-INF/template/853_vm.vm[line 121, column 36]