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From: Andreas Leitgeb <avl@logic.at>
Newsgroups: comp.lang.java.programmer
Subject: Re: How do I compile my Java 8 SE code with OpenJDK 11?
Date: Fri, 2 Aug 2019 07:00:08 -0000 (UTC)
Organization: A noiseless patient Spider
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Eric Douglas <e.d.programmer@gmail.com> wrote:
> On Wednesday, July 3, 2019 at 4:50:08 PM UTC-4, Eric Douglas wrote:
>> Everything compiles now with all these jar updates, now to clear up a
>> few deprecated method references.
> Now the only compile issue I have left is with deprecation, how to convert
> a class which is using Observer and Observable.

So far it is just a deprecation.  If your legacy code needs it,
then just ignore or silence these deprecation warnings.

https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/util/Observable.html

has a paragraph on reasons for deprecation and alternatives.

If Observable really and exactly fits your bill in your code, and
you want your code to last beyond the eventual removal, then write
and use your own.