development driver

I just got the latest development distribution (binaries) from pgsql site. I heard that in this version I can use
setFetchSize().Using it the driver will create cursor and fetch data from it, saving memory in the server side. The
problemis that I'm getting this exception, what's the problem? 

java.sql.SQLException: ERROR:  parser: parse error at or near "null" at character 23

    at org.postgresql.core.QueryExecutor.executeV2(QueryExecutor.java:286)
    at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:104)
    at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:66)
    at org.postgresql.jdbc1.AbstractJdbc1ResultSet.next(AbstractJdbc1ResultSet.java:135)
    at org.apache.commons.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:135)


--

 /~\ The ASCII        Felipe Schnack (felipes@ritterdosreis.br)
 \ / Ribbon Campaign  Analista de Sistemas
  X  Against HTML     Cel.: 51-91287530
 / \ Email!           Linux Counter #281893

Centro Universitário Ritter dos Reis
http://www.ritterdosreis.br
ritter@ritterdosreis.br
Fone: 51-32303341