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

[Jason Greene]

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
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--
Jason T. Greene
WildFly Lead / JBoss EAP Platform Architect
JBoss, a division of Red Hat