I'm not Lew but here's my $0.02 worth:

multiposting is posting the same info in two or more *separate* messages
to separate newsgroups.

crossposting is posting *one* message to several newsgroups (usually by
listing several newsgroups as the destination of one message). This
makes life easier for people who read several newsgroups (since their
newsreader knows they've already read that message in another newsgroup
- they don't end up reading the same stuff many times over)

http://www.cs.tut.fi/~jkorpela/usenet/xpost.html

Spamming often means unsolicited *commercial* messages, where the
poster's intent is to make a fast buck at someone else's expense.

So far as I can tell, the sole content of the site in question is
1) An image from Sun's website of J2EE v1.4 (old!) that links to Sun's
website.
2) A bunch of menus that lead to empty pages.
3) Google-ads to gather money.

Every few days it seems someone starts up yet another Java web-site with
a web-forum and no original content. There must be hundreds of them, who
needs another?

It seems rather easy to register a domain, create a web-forum, sit back
and wait for the google-ads revenue to pour in. Too easy maybe.

The OP has maybe half an A4 page for eight of the twelve main headings
(which I missed on first look) and nothing for any of the hundred or so
subheadings (though I've not clicked them all).

How much content did you have on *your* website before you felt it was
worth mentioning here? :-)

I strongly disagree with "much" but I take your underlying point about
being harsh.

Here is a definition from that site:

  "Ploymorphism is a bottom-up method call.
  Simply we can say " behaving differently at different places ".

I've nothing against such sites but this one has many dead links, some
stale info (Java 1.4!) and what few articles exist are not very
enlightening (if the above example is anything to go by).

I'd encourage the OP to either
1. spend his effort improving Wikipedia instead.
or
2. Prune all the dead links (placeholders) until he has some decent
content. Update the links from 1.4 to 1.6. Try to improve and develop
the existing articles. Don't spamvertise the site here but if someone
asks a question here which is answered on your site, only then reply
with a link to the directly relevant article - and only if the article
is *really* relevant.

Of course, since this is the Internet, the OP is free to ignore my
suggestions :-)