JDeveloper problem setting up a database connection

I am having some problem setting up a connection to my database. Before I say any more let me explain what I need. I need 2 database connections 1 to a 10g R3 database and one to an 8.0.5.
I do realize that JDeveloper will only connect back to 8.1.7 because of the JDBC version that is installed with it.
What I really need to know is "Is it possible to define and use 2 different versions of JDBC" I really don't want to move back to the version that works with both because I am afraid of what performance/benefits I will lose from the latest and greatest.
The latest version that I can determine will work with 8.0.5 is the last version for 9i.
Any Ideas would be helpful.
The reason for this situation is that I have a production database that I will have to keep up with until the full version of the system is complete so that is why I even care about 8.0.5.
Thanks alot for your time,
Thom

I have a similar problem and I would much appreciate any help in this matter.
I have a wireless network set at home with two computers connected to it:
My workstation called Home-ws and my laptop called Acer. I can access the d:\ drive of my workstation from my laptop without any problem.
On my workstation I installed the Oracle 10g product and on my laptop I installed Oracle SQL Developer. On SQL developer I am trying to create a connection to the Oracle server:
My settings are as below:
Connection name: orcl_system
User name: system
Password: ******
Host name: Home-ws
Port: 1521
SID: orcl
When I push test I am getting the following error message:
Status: Failure –Io exception: The Network Adapter could not establish the connection
Are there any special settings that should be made set up a wireless connection to my database?
Then I did the following things below:
1. I downloaded from oracle.com the instantclient-basic-win32-10.2.0.2-20060508.zip file and unzipped it in a folder called instantclient_10_2. There were a number of DLL and two jar files plus sqlplus.exe
2. I started sqlplus from that server
3. sqlplus failed with a similar error as sql developer.
4. I checked for tnsping. There is no tnsping such and exe on my laptop. I looks like I have to install the DLLs I downloaded them but there are no instructions about how to install them. Should I just copy them in system32 folder?
5. I looked for firewalls on my Home-ws workstation (where my oracle server is installed) and on my Acer laptop. The firewalls were activated. I added on exception called oracle for port 1521 on both computers and tried to connect again. I tried with both TCP and UDP options and it did not work in both cases.
I am out of ideas. Any help would be much appreciated.
Thank you in advance for your help.
Julian

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Error setting up a secondary database connection
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Connection to database system not possible with identifier "LCA".
|----
System environment
SAP-Release 700
Application server... "
Network address...... "
Operating system..... "Windows NT"
Release.............. "5.2"
Hardware type........ "8x AMD64 Level"
Character length.... 16 Bits
Pointer length....... 64 Bits
Work process number.. 8
Shortdump setting.... "full"
Database server... "
Database type..... "ORACLE"
Database name..... "SC7"
Database user ID.. "SAPSC7"
Terminal................. " "
Char.set.... "C"
SAP kernel....... 701
created (date)... "Jul 6 2009 23:47:55"
create on........ "NT 5.2 3790 Service Pack 1 x86 MS VC++ 14.00"
Database version. "OCI_10201_SHARE (10.2.0.2.0) "
Patch level. 50
Patch text.. " "
Database............. "ORACLE 9.2.0.., ORACLE 10.1.0.., ORACLE 10.2.0.."
SAP database version. 701
Operating system..... "Windows NT 5.0, Windows NT 5.1, Windows NT 5.2, Windows
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E:\usr\sap\SC7\SYS\exe\uc\Copy_ of_NTAMD64_15062009>sdbregview -l
Server Utilities    e:/sapdb/programs      7.7.02.08     64 bit    valid
DB Analyzer         e:/sapdb/programs      7.7.02.08     64 bit    valid
PCR 7301            e:/sapdb/programs      7.3.01.21               valid
PCR 7500            e:/sapdb/programs      7.5.00.42     64 bit    valid
SAP Utilities       e:/sapdb/programs      7.7.02.08     64 bit    valid
APO LC APPS         f:/sapdb/lcs/db/sap    6.00.004      64 bit    valid
Redist Python       e:/sapdb/programs      7.7.02.08     64 bit    valid
Base                e:/sapdb/programs      7.7.02.08     64 bit    valid
JDBC                e:/sapdb/programs      7.6.03.02               valid
Messages            e:/sapdb/programs      MSG 0.5010              valid
ODBC                e:/sapdb/programs      7.7.02.08     64 bit    valid
SQLDBC 77           e:/sapdb/programs      7.7.02.08     64 bit    valid
Database Kernel     f:/sapdb/lcs/db        7.7.02.08     64 bit    valid
Loader              e:/sapdb/programs      7.7.02.08     64 bit    valid
SQLDBC              e:/sapdb/programs      7.7.02.08     64 bit    valid
SQLDBC 76           e:/sapdb/programs      7.6.01.15     64 bit    valid
Fastload API        e:/sapdb/programs      7.7.02.08     64 bit    valid
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disp+work information
kernel release                701
kernel make variant           701_REL
compiled on                   NT 5.2 3790 Service Pack 1 x86 MS VC++ 14.00
compiled for                  64 BIT
compilation mode              UNICODE
compile time                  Jul 6 2009 23:47:55
update level                  0
patch number                  50
source id                     0.050
supported environment
database (SAP, table SVERS)   700
                              701
operating system
Windows NT 5.0
Windows NT 5.1
Windows NT 5.2
Windows NT 6.0
Thanks for quick responce.
Suraj

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