Queries in SQL developper do not return anything?

Hello there,
First of I am completely new to Oracle and IT in general. Apart from having used computers since the heyday my knowledge of programming is very little. I have been reading Oracle documentation and bought the CBT nuggets tutorials to prepare for examination.
I have followed the instructions to install the HR schema which worked in SQL*Plus but whenever i go into SQL developper and create a connection using the same username/password as I did in SQL*plus, then type in the select table_name from user_tables; query, nothing happens.
What am I doing wrong? Am i simply not connecting to the same DB?
Thanks in advance

So when i set up the HR schema using SQL plus and was prompted to give a password for HR, i did that. Now when i open up the SQL plus (as administrator) and log in using username HR and the password i set for it, I can access the Schema's default tables such as employees.
However on SQL developper, I open up a new connection called HR and put the same password that HR uses on SQL plus but whenever I attempt a select statement there are no returns. It just seems like SQL developper is not connected to the database.
I am currently using the CBT nuggers tutorial for the fundamentals exam 1z0-051 and the tutorial uses both SQL developer and SQL plus.
I appreciate all the responses but unfortunately I am stuck :(
I get this message when i go to Query builder:
Text is not a valid, single SELECT statement.
Syntax Error at line 4, column 9
select * employees;
^^^
Expected: ',','BULK','FROM','INTO',BULK_COLLECT_opt,from_clause,into_list,
Query Builder disabled.
Edited by: Vlakarmis on Jan 2, 2013 7:04 AM

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Queries in SQL developper do not return anything?

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