Accessing files in directory using Java SP in 10g

Hi all-
I have set up a directory in 10g which points to an existing directory in the operating system and am trying to get the list of files in it from a Java stored procedure. The directory in Oracle is called "Upload_to_Oracle" and am trying to get the files in the sp by calling:
File f1=new File("Upload_To_Oracle");
File fs[] =f1.listFiles();
System.out.println("The count of files is " + fs.length);
The problem is fs is null, so fs.length causes an exception to be thrown. Initially I was getting an error:
the Permission (java.io.FilePermission Upload_To_Oracle read) has not been granted to ILFORD. The PL/SQL to grant this is dbms_java.grant_permission('ILFORD', 'SYS:java.io.FilePermission', 'Upload_To_Oracle', 'read')
which I (think) I resolved by executing that command as SYS (this is a dev box used by just me) and logging out of sqlplus and back in.
I haven't been able to find anywhere how you're supposed to reference an Oracle directory in Java, so in all honesty, I don't know if this is how you're supposed to do it.
Any help would be appreciated.
Thanks,
Ilford

I figured it out for anyone who needs something similar; the problem is that the Oracle directory is specific to particular files that Oracle will use for loading (BFiles, etc.). To get at the file system directory, I just needed to reference the actual system directory itself, as well as grant it permission.
So what it comes down to is that you should reference the directory in File() as if it truly were a regular Java app on the filesystem, making sure the appropriate permissions are set for both the user running Oracle (for file/directory access) as well as for Java access.

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