Re: Migration to Java11 and modules

[Ullrich Hafner]

> Am 03.01.2023 um 15:42 schrieb 'Jesse Glick' via Jenkins Developers 
> :
> 
> On Tue, Jan 3, 2023 at 8:08 AM Ullrich Hafner  > wrote:
>> Do we already have some guidelines on how to migrate a plugin to Java 11?
> 
> Yes; normally there is very little to do.
>  
>> Do we need to create module-info.java files for plugins?
> 
> No.
>  
>> How do we access libraries that use modules?
> 
> Jenkins does not use the Java module system, so there should be no change 
> from Java 8 usage modes. If there is some incompatibility in Java 11 in this 
> regard, then you may be the first to encounter it so you will need to debug 
> accordingly.

Ok, thanks for the info. Actually a bug in my own build chain. Somehow a 
module-info.class from one of my dependencies went into my classes folder and 
that caused the confusion for the Java compiler. Now everything works fine!

> Is this failure during the build itself, or in Surefire test runs? Without 
> any details it is hard to even guess what is wrong.
> 
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Re: Migration to Java11 and modules

['Jesse Glick' via Jenkins Developers]

On Tue, Jan 3, 2023 at 8:08 AM Ullrich Hafner 
wrote:

> Do we already have some guidelines on how to migrate a plugin to Java 11?


Yes; normally there is very little to do.


> Do we need to create module-info.java files for plugins?


No.


> How do we access libraries that use modules?
>

Jenkins does not use the Java module system, so there should be no change
from Java 8 usage modes. If there is some incompatibility in Java 11 in
this regard, then you may be the first to encounter it so you will need to
debug accordingly. Is this failure during the build itself, or in Surefire
test runs? Without any details it is hard to even guess what is wrong.

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Re: Migration to Java11 and modules

[Tim Jacomb]

I'm not aware of hitting any modules issues, this is the normal pull
request that has been applied:
https://github.com/jenkinsci/support-core-plugin/pull/421

at a guess 30+ plugins with no issues, likely more.

On Tue, 3 Jan 2023 at 13:08, Ullrich Hafner 
wrote:

> I’m currently starting the Java 11 migration of my plugins and my local
> builds are failing due to several Java modules failures (package x.y.z is
> declared in the unnamed module, but a.b.c does not use it,  error: module
> not found: x.y.z).
>
> Do we already have some guidelines on how to migrate a plugin to Java 11?
> Do we need to create module-info.java files for plugins? How do we access
> libraries that use modules? Or has someone already finished the the
> migration so I can have a look at the necessary steps?
>
>
>
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> .
>

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