Problems with jdbc & pgsql 6.5

I configured postgresql with the --with-jdbc option, installed it
correctly, and maked and set up the jdbc-postgresql .jar file properly.

The problem I'm having is that when I run the threadsafe jdbc example is
screws up giving me the following error message

Thread 3 has created a blob of oid 18849
Thread 1 running...
Thread 2 running...
Thread 3 running...
Waiting for threads to run
Thread 3:
FastPath call returned {1} FastPath call returned {1}
at postgresql.fastpath.Fastpath.fastpath(Compiled Code)
at postgresql.fastpath.Fastpath.fastpath(Compiled Code)
at postgresql.largeobject.LargeObject.write(Compiled Code)
at postgresql.largeobject.LargeObject.write(Compiled Code)
at example.threadsafe$thread3.run(Compiled Code)

My question is have I configured postgresql wrong and what should I do to
correct this.. I'm running with blackdown.org's java 1.2 pre-release v2.

Timbert