Clashes with LWJGL on Linux

[wyskoj]

I have a very specific problem and may be related to #30? I'm unfortunately not very knowledgeable about how the JVM interacts with native system calls, so this is a little out of my league.

My application requires LWJGL to operate. I have a Compose application that launches a jMonkeyEngine application—this is dependent on LWJGL. When LWJGL2 is on the classpath, attempts to open the file picker open an old, legacy file chooser:

This is also printed to the console: A call to chooseDirectoryNative failed: 'org.lwjgl.system.CustomBuffer org.lwjgl.PointerBuffer.rewind()'

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If I instead package LWJGL3, the true, native picker is opened:

However, the JVM will sometimes crash when selecting a file. (Seemingly randomly, it happens maybe half the time?) When it crashes the JVM does a memory dump, so I've attached that here.

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I package LWJGL by adding either of these dependencies to my Gradle build script: implementation("org.jmonkeyengine:jme3-lwjgl:3.5.2-stable") or implementation("org.jmonkeyengine:jme3-lwjgl3:3.5.2-stable").

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Therefore, I expect the file picker to load the native file picker (as seen in the second screenshot) without crashing. But—depending on the LWJGL version on the classpath—it either loads a legacy file picker, or randomly crashes.

If there's any other information I can provide, let me know.

[Wavesonics]

thanks for the detailed report! Which version was this, the recently released 2.0.2?

[wyskoj]

My application is based on Java 11 so I can't currently upgrade to 2.0.2, currently at 1.2.0.

I'm not opposed to migrating my application to 17 (in fact I probably should) so I'll see if I can get that migrated and see if the issue persists.

[wyskoj]

On Java 17 now and version 2.0.2. Having LWJGL3 on the classpath produces no problems (at least, I can't get it to crash). LWJGL2 still produces the legacy file picker and a new message is printed to console. First launch of file picker: A call to chooseDirectoryNative failed: null and subsequent calls: A call to chooseDirectoryNative failed: Could not initialize class org.lwjgl.system.MemoryStack.

So my personal issue is resolved... don't know if this LWJGL2 issue is something you want to pursue or not...