Java 9 has six weeks to live

Re:Java 9 has six weeks to live by fulafel on Wednesday February 07, 2018 @12:17AM (#16322382)

What are the practical problems Java apps typically run into when upgrading? Or is this more about not wanting to redeploy and test your app every 6 months?

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Re:Java 9 has six weeks to live by needusername on Thursday February 08, 2018 @01:55AM (#16330675)

I would say it depends, its quite easy to unknowingly depend on non-standard behavior that can break like HashMap iteration order.

What often causes issues is that every release has a new byte code version and the ecosystem relies heavily on byte code libraries so these will have to be updated across the board (eg. you use middleware that uses a framework that uses a byte code library).

Things on the top of my head that can break with Java 9:

- new gc logging options and format

- rt.jar and tools.jar are gone

- new JDK layout

- Corba, XML and Annotation classes no longer visible by default

- application class loader is no longer and URL class loader

- a different hack is required to munmap files

It's not too bad in general.

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Re:Java 9 has six weeks to live by therealmarv on Wednesday February 07, 2018 @03:39AM (#16323069)

as with every main version: Things can break. Using a Swing based app which I use every day and which I don't maintain... it did not work properly on Java 9 and I'm not responsible in fixing that.

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