[ImageJ-devel] [fiji-devel] moving to Java 7

Lee Kamentsky leek at broadinstitute.org
Fri Dec 5 08:56:36 CST 2014

For CelllProfiler, there's some packaging work that would need to be done
(we bundle the JRE with the Windows version and the Centos 6 RPM has Java 6
as a dependency). We rely on the system Java for the Mac presently and I
don't have a clear idea of what range of Java 7 support to expect on our
user's Macs.

It certainly seems like there is a lot of pressure to move to Java 7, so my
vote would be to move to Java 7, even considering the above.

On Fri, Dec 5, 2014 at 8:54 AM, Tobias Pietzsch <pietzsch at mpi-cbg.de> wrote:

> Hi all,
> what is everyones opinion on moving the IJ2/Fiji stack to a new version of
> Java, i.e., Java 7.
> Java 7 has been around for more than 3 years now. The end-of-life final
> public release of Java 6 was more than 1.5 years ago.
> Benefits I see are the following:
> * We could use the “new" Java 7 libraries. For example the Fork/Join
> framework would come handy in defining multi-threading interfaces in
> scijava-common (to be used in imagej-ops for example). Or the NIO2 stuff
> (java.nio.file)
> * We would benefit from improvements of type inference for generics in the
> compiler. No more jumping through hoops to fix “errors” in code that should
> compile with Java 6 but doesn’t. (Plus we could use the diamond operator to
> shorten generics instantiations.)
> * We could use third-party libraries that only support Java 7. For example
> I’m using Jetty in a project that can therefore not be part of Fiji
> currently. (This mail was more or less triggered by me looking into
> http://ojalgo.org who maybe went a bit over the top and already abandoned
> Java 7 for Java 8). I think it is only a matter of time until we will have
> a problem with third-party libraries that we already use abandoning Java 6.
> I do not have a clear picture of what the downsides would be. Johannes
> always said that people on old macs are tied to an old java version and
> that we do not want to leave those users behind. It would be interesting to
> know how many people that actually would impact.
> What do you think?
> best regards,
> Tobias
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