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From Peter Firmstone <j...@zeus.net.au>
Subject Re: Migration to Java 5
Date Mon, 30 Mar 2009 02:22:15 GMT
Greg Trasuk wrote:
> Just to be specific, I am NOT advocating any wholesale changes to the
> net.jini.* APIs to embrace Java 5 features.  I simply believe that at
> some point it is reasonable to say "Jini requires a Java 5-capable
> virtual machine" and as such, allow new APIs and code updates to use
> Java 5 features.
 I haven't seen anybody suggest changing the API, however if we did we 
would need to make sure it was backward compatible similar to the way 
Sun implemented Collections, as client code would break without being 
rewritten even on Java 5.
> As a side issue, EOL or not, Java 1.4 virtual machines are common in
> industry (e.g older versions of Websphere, etc), so many projects
> currently hold back from making the above assertion.  This may or may
> not be an issue for Jini.
That's the problem I'd like to mitigate with Retrotranslator.  Eg A 
client developer may not have the luxury to use JavaSE 5, there might be 
a company policy to use Java SE 1.4.2 for whatever reason.   A have your 
cake and eat it too moment, although I wouldn't call it a free lunch ;)  
If we have a separate download for River-X.X-J2SE1.4.zip, available over 
time, monitor the downloads, then we'll know what percentage of our 
client base is using 1.4

Looking at the Issues on Jira, I think some of these are going to be 
easier to solve using Java 5. 


> Cheers,
> Greg Trasuk.
> On Sun, 2009-03-29 at 20:59, Peter Firmstone wrote:
>> There's strong support for migrating to Java 5:
>> Jukka Zitting has proposed we migrate when renaming com.sun.* packages 
>> to org.apache.river.* (River-261)
>> What release should this be planned for, AR3?
>> Summary so far (Please correct me if I'm wrong):
>> Support for Java 5:
>> Dennis Reedy
>> Jim Waldo
>> Jonathan Costers
>> Greg Trasuk
>> Niclas Hedhman
>> Dan Roller
>> Greg Wonderly
>> Jukka Zitting
>> Sean Landis
>> Peter Firmstone
>> Additional support for Java 1.4 bytecode (not source) is possible with 
>> Retrotranslator at build time (I'm happy to implement Retrotranslator in 
>> the build scripts).  There would be a separate Java 1.4 bytecode release 
>> created at build time from the Java 5 class files after compiling with 
>> JDK 1.5 or later.  The separate installation / download for Java 1.4 
>> would allow us to asses remaining demand for Java 1.4.  Is anyone 
>> against this?
>> Are there any remaining concerns about dropping Source level support for 
>> Java 1.4?
>> Small devices can take advantage of the Surrogate architecture approach 
>> in future (seems to be a consensus among those on the list).
>> Cheers,
>> Peter Firmstone.
>> Jukka Zitting wrote:
>>> Hi,
>>> On Fri, Mar 27, 2009 at 5:33 PM, Patrick Wright <pdoubleya@gmail.com> wrote:
>>>> Perhaps the community can make a project-level statement like, "as of
>>>> release X, River will begin to use Java 1.5 (or 6) APIs and language
>>>> features."
>>> My proposal is that we switch to Java 5 as soon as we rename all the
>>> packages to org.apache.river.
>>> BR,
>>> Jukka Zitting

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