Can't connect to database with jdev-no more data to read from socket

I have installed database 10g XE and everything was working fine(connecting from sql plus,forms builder etc.).Yesterday i opened jdeveloper for the first time(i am a total newbie in the world of oracle) and as being said in the tutorial i tried to connect to the database.So i was trying to connect to the hr sample schema and my first error message was ora-12505,this is an error that is sid related.Ok,i said and went to the forums and found a few solutions to this problem.After configuring my sid and local host i clicked on test connection button and got this message:NO MORE DATA TO READ FROM SOCKET! I tried finding solutions but they all seem java related and i can't really understand it.I am sure that i have configured everything(sid,host name,etc.) good because i am not getting error messages like before.Any help would be highly appreciated!!
p.s. sorry for my english it's not my first language
regards

You now have two different ORACLE_HOME folders; 1 for DB & other for JDeveloper.
You neglected to specify OS name & version.
Make sure at the OS level that ORACLE_HOME is equated to the DB tree (not JDeveloper).

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Edited by RF123 at 01/28/2007 3:41 AM

R F wrote:
Hi,
I will appriciate your help with the following problem.
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####<Dec 20, 2006 10:47:49 AM EET> <Info> <JDBC> <ep> <mfserver> <Thread-14> <<WLS Kernel>
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<> <BEA-001067> <Connection for pool "oraclePool" refreshed.>
####<Dec 20, 2006 10:47:51 AM EET> <Error> <JDBC> <ep > <mfserver> <Thread-14> <<WLS Kernel>
<> <BEA-001112> <Test "select count(*) from DUAL" set up for pool "oraclePool" failed with exception:
"java.sql.SQLException: No more data to read from socket".>
####<Dec 20, 2006 10:47:51 AM EET> <Error> <JDBC> <ep > <mfserver> <Thread-14> <<WLS Kernel>
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