连接Oracle817数据库的错误提示

连接Oracle817数据库的错误提示

最简单的java连接数据库的例子如:
...
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbcracle:thintmserver:1521:ORCL";
conn=DriverManager.getConnection(url,"admin","admin");
...
就出错,javac没问题,java执行时就出现如下错误:
java.sql.SQLException:Refused:ROR=(CODE=12505)(EMFI=4))))
     at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:262)
请指教!谢谢!
      
不会没救了吧!      
JDBC connect error

Try a GUI client like Jdev      
能详细点吗?谢谢!      
You can write a jdbc OCI script to test it or try Jdep