Why I cannot connect to database after deploying application to OAS?

Question

Hello experts...i have a new problem and here are the facts:
I`m using on Windows Xp:
Oracle Database 10.2.0
Oracle Application Server 10.1.3
Oracle Jdeveloper 10.1.3.3
I`m creating a new application using jdeveloper and i`m using 2 connection classes:
a) First connection class using:
InitialContext ctx=new InitialContext();
DataSource ds=ctx.lookup("jdbc/connDS");
Connection conn=ds.getConnection();
b) Second connection class using:
Connection conn = DriverManager.getConnection("jdbc:and the entire link goes here");
So far so good, but when I create a ear file using the First connection class and after i deploy it to OAS my application will not connect anymore to database!
If I will use the Second connection class, and create an ear file then deploy it to OAS, my application works fine, it connects to database but i have a problem. In my application users can upload and download the files they uploaded. The files are saved in DB as blob. The problem appears when users are downloading the files because for example file "example.doc" is uploaded on the server database and when a user try to download it the name of the file is like "example_doc" and my pc open it like an html in which is a server 500 error. Someone told me that happens because of my connection class... and I want to find out you`re opinion.
Why i cann`t connect to DB after deploy the application on OAS using the FIRST connection class?
- on Jdeveloper i can connect to DB using both of the connect classes (one at a time)
- I`m creating a war file from jdeveloper and deploy the ear file on the OAS
- on OAS i`ve created the connection pool and the data source and "The connection was establish succesfully"
Why the uploaded files are downloaded in this way? it`s the connection the problem?
- I want to tell you that when i`m extracting data from the DB table i`m not using a temp file, the conversion is made in the java class and the program throws me the file to download.
- as i told you in Jdeveloper both of the connection classes work!!! and when i`m using the FIRST connection class and try to download, the files ARE DOWNLOADED PERFECTLY CORRECT!
- if i`m using the SECOND connection class in jdeveloper, running the application on the built in oc4j instance and trying to download the same files, the files are DOWNLOADED BAD like I told you: the name of the file is like "example_doc" and my pc open it like an html in which is a server 500 error. with the pdf format is the same problem but my pc cannot open it telling something with "bad conversion...." error.
There are someone who had the same problem?
Theoretically i had to make the application to connect to the database after deploy it to OAS with the FIRST connection class and this way my files will be downloaded corectly... what to do?

Answer 1

no one knows nothing about this issue? :(... i`m dissapointed...