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From Clinton Begin <>
Subject Re: Is HSQLDB compatible with ASF license?
Date Thu, 10 Feb 2005 16:55:01 GMT
My unit testing is always single threaded anyway.  I believe it's
generally agreed that spawning threads in a unit test is an
anti-pattern, so I avoid it.  Although, admittedly I sometimes wonder
how certain things can be tested easily without multiple threads.


On Wed, 09 Feb 2005 20:39:26 -0800, Daniel John Debrunner
<> wrote:
> > Hi all, I love Derby, but for unit testing it's just too slow. We used
> > to use HSQLDB before iBATIS joined ASF, but I switched to Derby it
> > because I wasn't sure if HSQLDB was compatible with the ASF license.
> There has been some discussion of adding a lower durability option to
> Derby, which would allow much faster database creation etc. for unit
> testing. Some internal testing flags already exist so I believe it's a
> fairly small amount of work to externalize them in a rational way. Come
> to the derby-dev list get involved to bring the issue up again (or fix
> it yourself)!
> I'm not sure how hsqldb can be used as a test database, given that
> multiple threads can overwrite each other, due to hsqldb only supporting
> dirty read mode (no isolation). Thus if you see incorrect results it
> seems you have to work out if hsqldb is the problem or your application.
> Dan.
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