There's no such patching available. I vaguely remember that one release (WildFly 8) did have a patch file but looking at Downloads · WildFly I can't find it. I haven't read too much about patching in the wildfly-dev list so I'm not sure if that feature of patching is still available and supported.

This answer is surprising!

In the menu of the web console I can see an item 'Patching'. When clicking on this it presents an button 'Apply a New Patch'.

What is this function doing, nothing?

Wolfgang Mayer wrote:

 

This answer is surprising!

 

Don't take my answer as authoritative.

Like I said:

I haven't read too much about patching in the wildfly-dev list so I'm not sure if that feature of patching is still available and supported.

The downloads page too doesn't have a patch available for any of the releases, so I don't know what the status of patching is in WildFly.

When I check Downloads · WildFly I can find following files:

Update Existing 8.0.0.Final Install

Update Existing 8.1.0.Final Install

What are these files used for?

Wolfgang Mayer wrote:

 

When I check Downloads · WildFly I can find following files:

 

Update Existing 8.0.0.Final Install

Update Existing 8.1.0.Final Install

 

What are these files used for?

Those are indeed the patch files for the next versions!

I vaguely remember that one release (WildFly 8) did have a patch file but looking at Downloads · WildFly I can't find it.

So turns out I was literally searching for "patch" on that page and hence didn't find them.

So based on that I'm guessing that patch files are released only for minor version releases. That would explain why the 9.0.0.Final doesn't have one.

Patch file for 8.2 --> 9 is bigger than whole distro.

also we don't have a policy how patches apply to new kind of distros we introduces like "servlet"

and until this is ironed out it would just cause confusion.

but in any case if you want to build a patch you can do so

code for patch generator is https://github.com/jbossas/patch-gen

where you can find instructions how to build patches.

if you just need to upgrade existing wildfly 8 to 9, you can just download new version.

and copy over standalone/configuration folder from your old instance and you should be good to go.

server will automatically upgrade the configuration.