using java servlets ,large objects with postgresql

i am trying to retrive my data through  Web using java servlets 
but it seems servlet is not able to get the driver as it gives 
the error : Fastpath: ERROR:  lo_tell: invalid large object descriptor
(-1)

ie. the servlet is not able to get the oid needed to retrieve the data

i get this error only when i am using servlet to retrieve the data,
i tried by keeping the postgresql.jar in servlet engine's lib directory 
also.

can anyone help to sort out this problem .it's important.
i am using JDK2.0 on solaris2.5 platform
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