How to connect to oracle from SQL Developer - oracle

Question

I have problem with connecting to Oracle from Sql developer. When I try this connection settings. it returns error from printscreen:
when I tried tns ping, it returns to me
C:\Windows\system32>tnsping XE
TNS Ping Utility for 64-bit Windows: Version 18.0.0.0.0 - Production on 09-APR-2021 23:47:25
Copyright (c) 1997, 2018, Oracle. All rights reserved.
Used parameter files:
C:\app\Uzivatel\product\18.0.0\dbhomeXE\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = XE)))
OK (0 msec)
Can someone give me a point what I doing wrong? Thanks for help.
l
snrctl status is C:\Windows\system32> lsnrctl status
LSNRCTL for 64-bit Windows: Version 18.0.0.0.0 - Production on 09-APR-2021 23:57:42
Copyright (c) 1991, 2018, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for 64-bit Windows: Version 18.0.0.0.0 - Production
Start Date 09-APR-2021 23:09:50
Uptime 0 days 0 hr. 47 min. 52 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\app\Uzivatel\product\18.0.0\dbhomeXE\network\admin\listener.ora
Listener Log File C:\app\Uzivatel\product\18.0.0\diag\tnslsnr\PoŔÝtaŔ\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=0.0.0.0)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
When I tryed to change to Sid, it returns me:
when I try to
C:\Windows\system32>lsnrctl reload
LSNRCTL for 64-bit Windows: Version 18.0.0.0.0 - Production on 10-APR-2021 00:10:54
Copyright (c) 1991, 2018, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 2: No such file or directory
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
The command completed successfully
But problem is still same:
I tried lsnrctl status and It return to me
C:\Users\Uzivatel>lsnrctl status
LSNRCTL for 64-bit Windows: Version 18.0.0.0.0 - Production on 10-APR-2021 02:01:20
Copyright (c) 1991, 2018, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for 64-bit Windows: Version 18.0.0.0.0 - Production
Start Date 10-APR-2021 00:44:34
Uptime 0 days 1 hr. 16 min. 45 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\app\Uzivatel\product\18.0.0\dbhomeXE\network\admin\listener.ora
Listener Log File C:\app\Uzivatel\product\18.0.0\diag\tnslsnr\PoŔÝtaŔ\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=PoŔÝtaŔ)(PORT=1521)))
Services Summary...
Service "ORCL" has 1 instance(s).
Instance "xe", status BLOCKED, has 1 handler(s) for this service...
Service "XE" has 1 instance(s).
Instance "XE", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
it seems that there is some problem, isnt it?

Answer 1

UPDATE
I wrongly supposed your Database was running.
Start your database by issuing a startup
CMD> sqlplus /as sysdba
SQL> startup
Before attempting to connect, check your listener with lsnrctl status you should now see the XE service there.
If everything's in place, you should then be able to connect.
As far as I can see, there's no service named XE
You can either connect by selecting SID instead of SERVICE NAME
Or try to add a static registration to your listener.ora
LISTENER =
(DESCRIPTION_LIST =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  )
)
SID_LIST_LISTENER=
(SID_LIST =
   (SID_DESC=
     (SID_NAME=XE)
     (SERVICE_NAME=XE)
     (ORACLE_HOME=C:\app\Uzivatel\product\18.0.0\dbhomeXE)
   )
)
Reload the listener
lsnrctl reload
And then try to connect via SQL Developer, using the SERVICE NAME
Another thing you can try, is getting inside the Database and issue a
alter system register;
To see if the database register against the listener by itself.

Answer 2

Are you sure that "XE" is your services name??
Try selecting SID and set a name to the connection