There is no such thing as 'JDK.x -
JAXB implementations use both SAX and DOM parsers so it isn't clear what you mean by 'what is the parser'.
I mean JDK.x (x=version) JDK.6, JDK.7 etc etc
I want to know about the JAXB that is available in JDK. Which parser does the JAXB available in JDK use.???
Whichever one the developers found more convenient? Look at the source code if you really must know, I certainly don't. I only care about what it can do, not about how it does it.