Warnings with Java 9

[JuKu]

Issue details

I get an warning in logs, if i use Java 9 (in Java 8 there isnt this log).

Reproduction steps/code

Create an libGDX project and use java 9.

I have also tagged the source code:
https://github.com/leeks-and-dragons/leeks-and-dragons/tree/java-9-warnings

Version of LibGDX and/or relevant dependencies

libGDX Version 1.9.6 (newest version).

Stacktrace / Log

If i execute the game, i get the following warning log (the game works, but this warning is shown):

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.lwjgl.LWJGLUtil$3 (file:/D:/Users/<Username>/.m2/repository/org/lwjgl/lwjgl/lwjgl/2.9.2/lwjgl-2.9.2.jar) to method java.lang.ClassLoader.findLibrary(java.lang.String)
WARNING: Please consider reporting this to the maintainers of org.lwjgl.LWJGLUtil$3
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Please select the affected platforms

• Android
• iOS (robovm)
• iOS (MOE)
• HTML/GWT
• Windows
• Linux
• MacOS

This was only checked with windows.

[intrigus]

I suggest closing this as won't fix.
The problem is caused by lwjgl 2 which will not receive any updates.
Lwjgl 3 fixes all these problems, so should just ignore the warnings.
By the time that those accesses are not possible, lwjgl 3 will probably be the default libgdx backend.

[JuKu]

Yes of course, but LWJGL3 is more experimental in libGDX, or? If i migrate from LWJGL2 to LWJGL3 i get a few new errors, also fullscreen support (live switching between windowed and fullscreen mode) doesnt really works yet.

…

-----Original-Nachricht----- Betreff: Re: [libgdx/libgdx] Warnings with Java 9 (#4927) Datum: 2017-10-13T09:16:32+0200 Von: "intrigus" <notifications@github.com> An: "libgdx/libgdx" <libgdx@noreply.github.com> I suggest closing this as won't fix. The problem is caused by lwjgl 2 which will not receive any updates. Lwjgl 3 fixes all these problems, so should just ignore the warnings. By the time that those accesses are not possible, lwjgl 3 will probably be the default libgdx backend. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#4927 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/ABFdfrzsiwGL1MzGr5ovMrnCMv8iK9n1ks5srw5JgaJpZM4P3wrX> . {"api_version":"1.0","publisher":{"api_key":"05dde50f1d1a384dd78767c55493e4bb","name":"GitHub"},"entity":{"external_key":"github/libgdx/libgdx","title":"libgdx/libgdx","subtitle":"GitHub repository","main_image_url":"https://cloud.githubusercontent.com/assets/143418/17495839/a5054eac-5d88-11e6-95fc-7290892c7bb5.png","avatar_image_url":"https://cloud.githubusercontent.com/assets/143418/15842166/7c72db34-2c0b-11e6-9aed-b52498112777.png","action":{"name":"Open in GitHub","url":"https://github.com/libgdx/libgdx"}},"updates":{"snippets":[{"icon":"PERSON","message":"@intrigus in #4927: I suggest closing this as won't fix.\r\nThe problem is caused by lwjgl 2 which will not receive any updates. \r\nLwjgl 3 fixes all these problems, so should just ignore the warnings. \r\nBy the time that those accesses are not possible, lwjgl 3 will probably be the default libgdx backend. "}],"action":{"name":"View Issue","url":"#4927 (comment)"}}}  <div style=\"border:0;border-bottom:1px solid black;width:100%;\"> Gesendet mit Telekom Mail <https://t-online.de/email-kostenlos> - kostenlos und sicher für alle!

[xGnoSiSx]

Be carefull,
It's too early to rush Java 9 compatibility. Note that most people with projects here still use Java 6/7.

Even -SourceCompatibility 8 is not fully supported.

Everything written in the engine must run on Android and RoboVM - does that support Java 9? ..so good luck!!

[francogp]

@JuKu I'm using LWJGL3 and libGDX use version 3.1.0, that has warnings too. LWJGL3 version 3.1.3+ fixes all warnings using java 9.
NOTE: If you get errors, is because you are configuring libGDX code in the wrong way.
@xGnoSiSx Java 9 works just fine on all my libGDX projects, using LWJGL3 (except for the illegal reflective access warning, that get fixed on LWJGL 3.1.3+).

[JuKu]

@francogp Thanks for your answer!
Does the newest libGDX version includes LWJGL3 3.1.3 or later?

[francogp]

@JuKu yes. That's why this issue is closed.

[JuKu]

@francogp Thanks!
I am using LWJGL 2, because switching windowed and fullscreen mode doesnt work correctly with LWJGL3.
But i think i have to upgrade to fix this problem.

[francogp]

@JuKu I'm using LWJGL3 on Linux and Windows, without problems on fullscreen switching. I'm only having V-Sync problems on AMD graphics card, because of libGDX implementation.

[xGnoSiSx]

I can also report no issues on fullscreen switching. The previous LWJGL update (not 3.1.3) fixed everything.
I just need to find more time to work with my codebase....

[JuKu]

@francogp @xGnoSiSx thanks for your answers!
Maybe i should try LWJGL3 backend again.