Date time format out of range????

Hi,
I'm using my java application to access a pg8 database, but now I'm getting
the following error performing the following insert:

[Logger - info] Preparing a statement for the query <INSERT INTO persona
VALUES('FRR999','LUCA','FERRARI','19/07/1978','0000000000000','000000000','00000','BLLLLLLLLLLLLLLLLLL','Modena','Modena','','31/9/2006','luca','31/9/2006','luca')>
[Logger - error] Caught SQL exception in query execution
org.postgresql.util.PSQLException: ERROR: date/time field value out of
range: "31/9/2006"
org.postgresql.util.PSQLException: ERROR: date/time field value out of
range: "31/9/2006"
at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1525)
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1309)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:188)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:452)

While in other tables it has worked with dates!
The information about the table persona are the followings:

gestione_personale=# \d persona;
Table "public.persona"
Column | Type | Modifiers
--------------------+-----------------------+-----------
codice_fiscale | character varying(20) | not null
nome | character varying(12) |
cognome | character varying(20) |
data_nascita | date |
telefono | character varying(20) |
cellulare | character varying(20) |
fax | character varying(20) |
indirizzo | character varying(50) |
citta_nascita | character varying(20) |
citta_residenza | character varying(20) |
titolo_studio | character varying(20) |
data_inserimento | date |
utente_inserimento | character varying(20) |
data_modifica | date |
utente_modifica | character varying(20) |
Indexes:
"persona_pkey" primary key, btree (codice_fiscale)
Foreign-key constraints:
"$1" FOREIGN KEY (utente_inserimento) REFERENCES users(username)
"$2" FOREIGN KEY (utente_modifica) REFERENCES users(username)
"$3" FOREIGN KEY (titolo_studio) REFERENCES titolo_studio(titolo)
"$4" FOREIGN KEY (citta_residenza) REFERENCES citta(denominazione)
"$5" FOREIGN KEY (citta_nascita) REFERENCES citta(denominazione)

Any idea?
Thanks,
Luca