syntax for increasing java memory

[Kevin Laurie]

Hi Guys,
 I am a newbie on Solr and I am just using it for dovecot sake.
Could you help advise the correct syntax to increase java heap size using
the  -xmx option(or advise some easy-to-read literature for configuring) ?
Much appreciate if you could help. I just need this to sort out the problem
with my Dovecot FTS.
Thanks
Kevin