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 problem is 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)

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