Can't create connection to local database

I'm trying to create a connection to a local database but I'm having problems.
Currently we use SQL Plus to do work on the local database. With that we don't need to specify a host string we just leave it blank and it connects with no problems. SQL Developer is now requiring a host string, what are we supposed to use?

I added this to the tnsnames.ora to try to help
ORCL.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = tcp.world)
(PROTOCOL = TCP)
(Port = 1521)
(CONNECT_DATA = (SID = ORCL)
You want something simpler, more like this.
ORCL.world =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ORCL)
Trying to connect after that I get an error saying
ORA-12541 TNS no listener.
I made sure the listener service is started but I
don't know what else I need to do with the listener.In a command window, type lsnrctl status. It should show what port the listener is running on and what services it is supporting. You should modify your tnsnames.ora to match
Post the output here if you need more guidance.
Message was edited by:
smitjb

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Well i've found a post at a similar thread, where somebody told to try to compile and run the project in release mode.
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hi guys
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db2 SID - unicode (install later)
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hi paul,
sorry for the late reply.
I was out of town this weekend.
thank you so much for replying..
Here is my test results.
inside command prompt
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So out of curiousity, i done this testing..
1) connect to both database and shut them down
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ok..
5)now i stop the ORCL service
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