Hi stylemangi,
I've used Java in my WP blogs in the side bar. Never tried to in an actual post.
But with WP you can also create pages which I think are just plain HTML pages.
The advantage to the pages is they will automatically match the rest of the blog based site.
For instance this is a PAGE from my blog:
http://affiliate-blogs.5staraffiliat...rcentric-blog/
I have a plug-in that displays another affiliate blog on this page, but I could also add Adsense or YPN with ic Javascript.
Scroll down on my sidebar til you see Recent Referrers:
http://affiliate-blogs.5staraffiliateprograms.com/
That's generated with Java too.
Hope this helps and best of luck!