to much process

Hello,

  I use postgres with my servlet on a linux box. Sometimes when I do
a 'ps auxf' I saw that I have a lot (about 20) of postgres process like this:
postgres 19025  0.0  0.7 31124  988 ?        SN    2000   4:59 /cassiope/usr/local/postgresql-7.0/bin/postmaster -D /cassiope/var/pgdata2 -p 5430 -i
postgres 25749  0.0  2.1 31472 2724 ?        SN   09:18   0:00  \_ /cassiope/usr/local/postgresql-7.0/bin/postgres 127.0.0.1 admintp truckplus_1 idle  
postgres 26528  0.0  2.3 31680 2976 ?        SN   10:00   0:00  \_ /cassiope/usr/local/postgresql-7.0/bin/postgres 127.0.0.1 admintp truckplus_1 idle  
postgres 26663  0.0  2.1 31492 2788 ?        SN   10:09   0:00  \_ /cassiope/usr/local/postgresql-7.0/bin/postgres 127.0.0.1 admintp truckplus_1 idle  
 
And sometimes when the number of process is so big, I can't connect to postgresql with jdbc :o(.
Apparently, the connections opened are not close by the garbage collector ...

Is there a solution to avoid such problem ?

Thanks.
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