Java 11 as a javac target?

[Jerry Malcolm <te...@malcolms.com>]

Should Java 11 be supported as a compile target?  I can compile the 
current master branch using Java 11 and run the result on Java 11.  But 
the target when it compiles is set to java 8.  I have some mailet code 
where I'd like to take advantage of some new classes and methods that 
are introduced in Java 11.  But the mailets have to be java 8 target as 
well or james won't start. I'm compiling for my own use on java 11.  So 
I don't need to support older versions with my builds.

I tried changing the target in pom.xml from 8 to 11 and got a compile 
error that it can't find javax.annotation.PreDestroy which is apparently 
removed after java 8.

If this is a quick fix to make it compile with java 11 target, and you 
don't think it will hurt anything else, I'll see if I can find 
alternatives so I can compile with java 11 target.

If the solution is not trivial, do you have an estimate as to when JAMES 
will fully support a java 11 compile?

Thx.

Jerry


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