SaxParser can't find dtd file

Question

I've done XML for a while but I've never used DTD files before. Now I'm tryign to parse a XML file
that has the following tag in it:
<!DOCTYPE Obj SYSTEM "s4.dtd">
The parser keeps giving me this exception:
org.xml.sax.SAXParseException: File "s4.dtd" not found.
I have placed the file s4.dtd in the same directory as the xml file. I'm using JBuilder (please don't say that was my first mistake!! (-:) and I've put a copy of the file in my "Working directory" but I still get the same error. I've tried specifying an absolute path in the xml file in different ways like this:
<!DOCTYPE Obj SYSTEM "c:\xml\s4.dtd">
<!DOCTYPE Obj SYSTEM "c:\\xml\\s4.dtd">
<!DOCTYPE Obj SYSTEM "c:/xml/s4.dtd">
but they don't seem to make any sense to it.
Please help!!!!

Answer 1

The DTD needs to be in the same file as the XML file if you are going to specify it that way. You say you did that, so that probably means the parser can't determine what directory the XML file is in. Perhaps you passed the parser a FileReader or something like that? At any rate, the problem with your other attempts at fixing the DTD reference is that it is supposed to be a URL. Try something like this:
<!DOCTYPE Obj SYSTEM "file://c:/xml/s4.dtd">
(You may need file:/// instead of file://, experiment with that too.)