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From Andrus Adamchik <>
Subject Re: Writing blobs fails
Date Tue, 03 Jul 2012 18:31:30 GMT
Interesting ... yeah the code in Cayenne seems to contradict the "setBinaryStream" contract.
The javadoc states "pos - the position in the BLOB value at which to start writing; the first
position is 1"... So yeah, looks like a bug. Somehow that worked with "0" before in our unit
tests, but will try "1" as well :)

Should be able to verify tomorrow. 


On Jul 3, 2012, at 12:54 PM, Durchholz, Joachim wrote:
>> Has this problem been fixed in 3.1B1?
> I don't think so. The relevant line from the stack trace is line 255 in java/org/apache/cayenne/dba/oracle/
> On trunk in /trunk/framework/cayenne-jdk1.5-unpublished/src/main/ , this line reads:
>  OutputStream out = blob.setBinaryStream(0);
> Offsets in JDBC generally start at 1, not zero, and the JDBC specs on Blob#setBinaryStream
are no exception, so this should be
>  OutputStream out = blob.setBinaryStream(1);
>> And one that describes what's happening (not Cayenne specific):
> The salient point is in the last answer, by Ale Gonzalez: Don't use 0 on setBinaryStream.
> Actually, it's even documented in the Javadoc for #setBinaryStream.
> (Somebody deserves to roast somewhere unpleasant for having JDBC use 1 and the rest of
the JDK use 0. It's a first-rate source of bugs.)
>> Or is our only option to find and use an older Oracle JDBC adapter.
> If you can work from the Cayenne sources, you might want to consider applying that one-line
fix to the sources until upstream gets around to fixing this.

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