JDBC3 "invalid message format" error

I have 2 computers: Linux Debian 2.2.20-idepci + PostgreSQL 7.4.1 and
another WinXP running Java client application. I have a simple DB where
I'm trying to insert large number of records, >1000. This was done for
testing purposes. Problem: every time I run my client program it gets
"invalid message format" error but each time in different place from
content point of view: sometimes it fails after 200 records, sometimes
- after 1000. I have only single connection to DB (checked by ps aux |
postmaster) and actually can continue job using the same SQL Connection
object on which error occured. Any help is appreciated.

stack trace looks like this:
org.postgresql.util.PSQLException: ERROR: invalid message format

at
org.postgresql.util.PSQLException.parseServerError(PSQLException.java:139)

at org.postgresql.core.QueryExecutor.executeV3(QueryExecutor.java:154)

at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:101)

at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:43)

at
org.postgresql.jdbc1.AbstractJdbc1Statement.execute(AbstractJdbc1Statement.java:515)

at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:50)

at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeUpdate(AbstractJdbc1Statement.java:271)

at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeUpdate(AbstractJdbc1Statement.java:257)

Mikhail.

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