How to redirect domain to new domain?

[jadtn]

hi,
I ve 2 domains http://www.lorizon.fr and http://www.lorizon.com (new domain)

This is the same web site.

I see in forums to not have duplicate content, i have to redirect http://www.lorizon.fr -->http://www.lorizon.com
How can i do it? There is someone with an example?
i m using jboss 4.2.2.

Thanks

[jadtn]

Hi,
I think i have found but not completely:
In /conf/
I write this properties file : rewrite.properties

RewriteCond %{HTTP_HOST} ^www.a.fr [NC]
RewriteRule ^(.*) http://www.a.com/$1 [L,R=301]

In server.xml i put just after engine:

<Valve className="org.jboss.web.rewrite.RewriteValve" />

But with this the server redirect to http://www.a.com// instead of http://www.a.com/ (with only 1 / at the end)
If my rule is

RewriteRule ^(.*) http://www.a.com$1 [L,R=301] (remove / before $1)

the url is good.
So all exemple i found on internet
rule was

RewriteRule ^(.*) http://www.a.com/$1 [L,R=301]

and not

RewriteRule ^(.*) http://www.a.com$1 [L,R=301]

It s seem i have not the standard behaviour. There is someone who has this strange behaviour? So what is the risk i f use "my" rule?

Thanks
I use Jboss4.2.2/richfaces/jsf(sun)