XML plays what role in J2EE ?

[Arfoo Huang]

I am totally lost after read the J2ee 1.4 tutorial. How do we use SAX, DOM, JAX-RPC, SOAP in a J2EE model? For a web-based j2ee application, is there an example that is using xml (not just for descriptors)?
By the way, is the PetSore example using XML API/Parsers I mentioned?
Thanks.

[Lasse Koskela]

You might want to check out the newer Adventure Builder reference application instead (which apparently uses most of the technologies you mentioned).

[Arfoo Huang]

For building an online store, should Adventure Builder or PetStore framework/technologies be used? Thanks.

[john smith]

Its a facetious answer I know, but if you don't know *why* you would use one particular technology then either 1) don't use it, or 2) take the time to learn said technology and see if it would be best-fit in your design.