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Custom StAX Parser for XML using javax wrappers

Custom StAX Parser for XML using javax wrappers
How do you do this; or at least good suggestions on the right documentation / examples / tutorials?
I've been using the javax.xml.stream package to process XML files but the application is begging for some "non-standard XML" (easy to understand what the means if you're not picky). I can write the parser, but I want this to be configurable: so that the app continues to use the same XML processing code except for changing the parser as needed.
The hard part at this point is finding concrete info on how this is done. Documentation speaks of, for example, configuring the parameters of SAXParserFactory and such, but I haven't found specific documentation or examples. I've even looked into some existing StAX source code. Need some good hints / guidance on how this is done in order to move forward.

According to the documentation, you can't. You can use one of three approved parsers. Anything else will result in an error.

Writing and reading from an XML file with Slick2D

I was wondering how you would go about writing and the reading from an .XML file using the Java library Slick2D.
I have googled for the last couple of days and have found nothing succinct and simple that explains what I'm looking for.
I am looking for 3 things:
How to create an .XML file (would be awesome to be able to search a directory to see if there is an existing file and only create a new file if one does not already exist.
How to write to the created .XML file.
How to read from the found .XML file.
The reason for this is that I'm trying to create a save/load class for a game.
Just a general snippet of code, that I'd be able to modify for my needs would be great even for a learning experience.
So now for my question, does anyone have any information that may help me on my quest to succeed in my above stated three goals?

For checking if a file exists you can use the exists() method of java.io.File. See this for more information.
I don't know if slick2d provides it own xml utilities but you should always be able to use the standard java ways of reading/writing xml. You can use the DocumentBuilder like shown in this tutorial or a sax parser like described here. If you need to work with complex xml structures it might be worth to look into jaxb.

creating a .xml file from .xsd with java

I'm a quite new to java world and I have a requirement of generating an .xml file from an .xsd file
I did some research and found that 'jaxb' could do it. And I found some example too, but the problem is, almost all the examples uses 'xjc' tool to do this. But I want a way to do this through my java code.
Os this possible?
if yes, I'm thinking something like this, from my java code
load the .xsd file
generate the .xml
save the .xml file
Can someone direct me to a good resource and or tell me if my thinking is wrong

I've had good experiences using XMLBeans, however I've always had the XSD available at compile time. It integrates nicely with Maven (plus potentially other build systems). The compilation produces a series of Java classes that can be used to construct an XML document that conforms to the XSD or process an XML file you've received.
You can potentially do some runtime processing of an XSD using the org.apache.xmlbeans.XmlBeans.compileXsd class, but I've never experimented with it. Just seen a reference from an FAQ.

I think the main problem is that to do it in a clean way you should have classes reflecting your xsd. Xsd defines a data model, so the important part is to recreate it with classes. If you want to do it dynamically it could be rather difficult. If you want to do it at compile time- jaxb is the way to go. There is very interesting article talking about problems related with parsing xml (it goes from a different perspective than you describe), but I think there is a wealth of knowledge to be learned from here:
http://elegantcode.com/2010/08/07/dont-parse-that-xml/

Java Jackcess Library Documentation?

I need to read and write some data on .mdb Access file and over the web I found the Jackcess library that that does exactly that.
Unfortunately I could't find any documentation to use that. On the library website there are a couple of examples, but no real documentation. Can anyone tell me if there's some sort of documentation somewhere?

The javadoc is intended to be fairly explanatory. The primary classes would be Database and Table. The library is also heavily unit tested, so you can dig into the unit test code to see many examples. There isn't currently a great "getting started" document. It has been discussed before, but, unfortunately no one has picked up the ball on actually writing it. That said, the help forum is actively monitored.
UPDATE:
There is now a cookbook, which is the beginnings of a more comprehensive user-level documentation.

You can use jackcess-orm that use DAO pattern and POJO with annotations.

Using FlatWorm to Write a Flat File

Good Afternoon in my timezone.
In my current web project, i have to write a flat file(with some fixed rules).After a web research i found a library which is called FlatWorm that help's me write flat files in a easy way.The problem is that there is a lack of information regarding the XML definition file.I have the FlatWorm API, but there is nothing related with the XML definition file and all the tags and attributes that build it.
Anyone that use and knows about this framework can give me a clue ?
With best regards.
Thanks in advance

I would start by RTFMing. There appears to be a fair amount of information on there that should get you kick started, including some examples you could start by modifying.
Google suggests some other examples, such as, http://javaconfessions.com/2009/04/writing-flat-files-in-java-with.html and http://andreamoz.blogspot.com/2010/12/meet-flatworm.html
Unfortunately the DTD for the XML descriptor either never existed, or at least doesn't any more. If needed, I would look through the XML parsing source to see what the flatworm library actually makes use of.