Improvements to work with Java 9

tobias commented 7 years ago

Changes include:

update to dynapath 0.2.5 (0.2.4 was broken when AOT'd under < Java 9, but used under Java 9)
conditionally seal the AppClassLoader if it is available (it isn't under Java 9)
seal the new ParentClassLoader from boot-bin
use a URLClassLoader subclass that exposes .addURL so it can be modified (we can't call .setAccessible on URLClassLoader.addURL by default under Java 9) as the highest loader in the shim

This is part of the fix; https://github.com/boot-clj/boot-bin/pull/4 is the other half. These changes shouldn't break users using a boot.sh without PR4.

Let me know if this (or the approach in PR4) aren't appropriate, and I'm happy to discuss more here or on slack.

tobias commented 7 years ago

I should mention that with these changes + PR4, boot works for me under Java 9-ea+148, but I haven't tried anything fancy with it, just starting a repl.

alandipert commented 7 years ago

I tested that this doesn't break existing boot.sh. :+1:

boot-clj / boot

Improvements to work with Java 9 #539