I don’t see a problem with it. What is released will still run fine on Java 7. 
It will just have some Java 9 components in the jar.  The release is scheduled 
for late July. I haven’t seen any indication that it will be pushed again. I 
would rather be ready to take advantage of Java 9 on the day it is released 
then be playing catch-up.

Ralph

> On Mar 15, 2017, at 8:38 AM, Mikael Ståldal <mikael.stal...@magine.com> wrote:
> 
> It would be bad to require Java 9 to build the main project as long as Java 9 
> is not released.
> 
> On Wed, Mar 15, 2017 at 4:27 PM, Ralph Goers <ralph.go...@dslextreme.com 
> <mailto:ralph.go...@dslextreme.com>> wrote:
> I can’t change the JDK from JDK 1.7. The rest of the build must be compiled 
> at Java 7 since that is what we support. I only want to compile the new 
> classes with Java 9.
> 
> Using a profile is a very good solution. We would have to run the build twice 
> but that would be OK.  I will give that a try.
> 
> Ralph
> 
>> On Mar 15, 2017, at 8:13 AM, Matt Sicker <boa...@gmail.com 
>> <mailto:boa...@gmail.com>> wrote:
>> 
>> You can change the JDK from "JDK 1.7 (latest)" to one of the JDK 9 versions. 
>> Since there's no official release of 9 yet, they don't seem to have a "JDK 9 
>> (latest)" profile set up on Jenkins yet.
>> 
>> As for building this, the best solution I've seen so far basically involves 
>> a bit of manual configuration using some inline ant tasks or similar overly 
>> complicated nonsense which doesn't work well in any IDE to date. It may be 
>> worth investigating the existing maven plugin ecosystem and seeing if we 
>> need a custom plugin developed for this. Could be a useful feature addition 
>> to maven-compiler-plugin, though I haven't tried contributing to Maven yet.
>> 
>> Using Maven profiles would help with this so that we can still build most of 
>> the project locally with JDK 1.7 or 1.8 as I doubt everyone wants to install 
>> JDK 9 on all their development machines while it's still in beta.
>> 
>> On 15 March 2017 at 10:07, Ralph Goers <ralph.go...@dslextreme.com 
>> <mailto:ralph.go...@dslextreme.com>> wrote:
>> I know how to implement the StackWalker code but I don’t quite know how to 
>> get it into the build. The main build needs to keep using Java 7 but of 
>> course the StackWalker stuff needs to be compiled with Java 9. Technically, 
>> I know how I could do that except I have no idea how it would work in 
>> Jenkins. It would also mean that everyone would be required to have Java 9 
>> installed in order to do the build.
>> 
>> An alternate approach would be to have the Java 9 specific classes in a 
>> separate repo with its own build. It would have to be “released” but we 
>> really wouldn’t need or want to release those jars to Maven Central as they 
>> would only be needed in the Log4j build - the classes would be copied into 
>> the Log4j jar.
>> 
>> If any of you know we can set a Jenkins variable to point to the latest Java 
>> 9 version that could solve the problem.
>> 
>> Ralph
>> 
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>> 
>> 
>> -- 
>> Matt Sicker <boa...@gmail.com <mailto:boa...@gmail.com>>
> 
> 
> 
> 
> -- 
>  
> 
> Mikael Ståldal
> Senior software developer 
> 
> Magine TV
> mikael.stal...@magine.com <mailto:mikael.stal...@magine.com>    
> Grev Turegatan 3  | 114 46 Stockholm, Sweden  |   www.magine.com  
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