using large objects with jdbc

I am using largeobject  for storing my datafiles in database
postgresql6.3.2

but when I try  to retrieve my data from database to a file.i get the following type of error

Exception caught.
java.sql.SQLException: Fastpath: ERROR:  lo_tell: invalid large object
descriptor (0)
java.sql.SQLException: Fastpath: ERROR:  lo_tell: invalid large object
descriptor (0)
       at postgresql.fastpath.Fastpath.fastpath(Fastpath.java:135)       at
postgresql.fastpath.Fastpath.fastpath(Fastpath.java:181)      at
postgresql.fastpath.Fastpath.getInteger(Fastpath.java:193)      at
postgresql.largeobject.LargeObject.tell(LargeObject.java:206)      at
postgresql.largeobject.LargeObject.size(LargeObject.java:221)      at dfile.<init>(dfile.java:86)       at
dfile.main(dfile.java:128)
how can i get rid of the above mentioned  errors.

manika


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