[문제] javax.servlet.ServletException: java.sql.SQLException: Listener refused the connection with the following error: ORA-12528, TNS:listener: all appropriate instances are blocking new connectionsjava.sql.SQLException: Listener refused the connection with the following error: ORA-12528, TNS:listener: all appropriate instances are blocking new connections 오라클을 계속 사용하다 보면 위 에러가 뜨면서 실행이 되지 않을 때가 있..
