Java 连接到 oracle 数据库需要永远

Question

I have been writing a java application using oracle database. Originally, my connection url was

jdbc:oracle:thin:@localhost:1521:XE

It has been working perfectly. I wanted to change my url so that I can connect to my database from any laptops. I changed my connection url to

jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS = (PROTOCOL = TCP)(HOST = LAPTOP-3ME2EPSM)(PORT = 1521))(CONNECT_DATA = (SERVER = DEDICATED)(SERVICE_NAME = XE)))

which is the format I found on the Inte.net. After changing my connection url, I cannot connect to my database anymore. There's no errors. The program just keeps running forever and the connection never finishes.

Below is my listener.ora:

DEFAULT_SERVICE_LISTENER = XE

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = some local address)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:some local address")
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = LAPTOP-3ME2EPSM)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

This is my tnsnames.ora:

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LAPTOP-3ME2EPSM)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

LISTENER_XE =
  (ADDRESS = (PROTOCOL = TCP)(HOST = LAPTOP-3ME2EPSM)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

XEPDB1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = LAPTOP-3ME2EPSM)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XEPDB1)
    )
  )

Answer 1

Check if you are able to connect using the URL using SQL Plus? Your database might be a local database.