[wildfly-dev] Smoothing the move from JDK 6 to 7

[Jason Greene]

If EAP diverges due to a patch, and then later we merge upstream after someone updates the entire file to use diamonds, then we get huge deltas referring to a ton of differences that have no practical value, and potentially conflicts.

Also it means that we have to use JDK7 IDE profiles with the source, which increase the odds of using JDK types/methods/fields/values that do not exist in JDK6. 


On Aug 30, 2013, at 5:18 PM, David M. Lloyd <david.lloyd at redhat.com> wrote:

> (Forgot to send to list!)
> 
> This lets us compile EAP with JDK 7 syntax though, that's the point.  We 
> can backport 1.7 syntax patches.
> 
> On 08/30/2013 05:01 PM, Jason Greene wrote:
>> The biggest problem with the diamond operators isn't bytecode, its back porting into EAP.
>> 
>> On Aug 30, 2013, at 4:46 PM, David M. Lloyd <david.lloyd at redhat.com> wrote:
>> 
>>> At this point in time, I'd say just about everyone wants to move ahead
>>> with Java 7 syntax because let's face it: there's a lot of nice stuff in
>>> there.  But until now, doing so meant that projects which rely on
>>> running on JDK 6 until the heat-death of the universe are on a fast road
>>> to pain and suffering.
>>> 
>>> Well, all that ends today... introducing "seven2six" [1], a tiny tool
>>> (only two source files) which losslessly converts version 51.0 (1.7)
>>> class files to version 50.0 (1.6).
>>> 
>>> With this tool in your build, you can switch your language level to 1.7
>>> without alienating your 1.6 users.  I've already got this integrated
>>> with JBoss Modules (it's quite simple to do as the README describes).
>>> 
>>> This could end Brian's major pet peeve of rooting out diamond operator
>>> usage in new WildFly files, among other issues.  I want to know what you
>>> guys think of bringing this in to WildFly (maybe even in to
>>> jboss-parent, honestly).  The initial version is released to Maven
>>> already at org.jboss.seven2six:seven2six:1.0.Final so feel free to mess
>>> with it and suggest improvements (just use the GH bug tracker for now I
>>> guess).
>>> 
>>> Thanks to Kabir Khan for the original idea and implementation/POC (I
>>> just polished it up with ASM), and James Perkins for the Maven
>>> integration code.
>>> 
>>> [1] https://github.com/dmlloyd/seven2six
>>> --
>>> - DML
>>> _______________________________________________
>>> wildfly-dev mailing list
>>> wildfly-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/wildfly-dev
>> 
>> --
>> Jason T. Greene
>> WildFly Lead / JBoss EAP Platform Architect
>> JBoss, a division of Red Hat
>> 
> 
> 
> -- 
> - DML
> _______________________________________________
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> wildfly-dev at lists.jboss.org
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--
Jason T. Greene
WildFly Lead / JBoss EAP Platform Architect
JBoss, a division of Red Hat