Problem with lwjgl

Newbie & Debugging Questions
#1

For the past week i have been working on several projects using lwjgl and everything was fine and dandy until i tried sharing my work.

I am running 64 bit jdk and my brother runs 32 bit windows xp. on both of these computers it runs fine.

My other friend is running 64bit java but he gets an UnsatisfiedLink Error

C:\Users\Ryan>java -jar C:\Users\Ryan\Desktop\MonMapEdit\MonstersMapEditor.jar
Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: Can't load librar
y: C:\Users\Ryan\native\windows\lwjgl.dll
        at java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.lang.Runtime.load0(Unknown Source)
        at java.lang.System.load(Unknown Source)
        at org.lwjgl.Sys$1.run(Sys.java:70)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
        at org.lwjgl.Sys.loadLibrary(Sys.java:95)
        at org.lwjgl.Sys.<clinit>(Sys.java:112)
        at org.lwjgl.opengl.Display.<clinit>(Display.java:135)
        at dragonhawk.monsters.mapeditor.editor.EditorWindow.run(EditorWindow.ja
va:161)
        at java.lang.Thread.run(Unknown Source)

i cant seem to figure out the problem , we have had him uninstall java and re install several times but still nothing.
im starting to think its something wrong with my set up.

anyone have any idea of what can be wrong?

#2

You need to include the LWJGL files in the program, and put them in the build path. Right now its searching for the files you linked from your computer, but seeing as they don’t exist on your friend’s computer, its throwing a link error.

#3

If you mean the natives, everything is already inside the folder.

There is a download link if you care to check it out. it would put my mind at ease to know if it runs on other peoples comps and not just mine and my brothers.

#4

Well, I downloaded it and ran it through a console, and I didn’t get any errors. It crashed, though after I loaded it up. It would just stop responding. Other than that, it ran fine.

#5

yeah takes a while to load up since it is making the tiles on start up from a buffered image and then making them into individual buttons.
if you run it and wait around 4-5 secs it should work fine.

also dont push the load+ button hehe. i mean for it to have some use further down the line.

glad to hear its not my set up. would still love some feedback on why its not working on my friends computer :confused:

#6

What is the architecture of your friend’s PC? I think it causes some problem.

#7

made him run os.arch and got amd64

his java works fine , and we are using all the latest versions of everything(java and lwjgl)

is there some other reason why it wont run? he has tried to compile and run it himself and it works fine in the ide just not as standalone runnable jar

#8

You are doing this:

C:\Users\Ryan>java -jar C:\Users\Ryan\Desktop\MonMapEdit\MonstersMapEditor.jar

It means that your current working directory is c:\Users\Ryan.

I guess you want to have C:\Users\Ryan\Desktop\MonMapEdit\ as current working directory no?

Maybe you need to go inside this folder and run:

java -Djava.library.path=native/windows -jar MonstersMapEditor.jar

?

#9

yeah but i have this code running to avoid such call and the need of a separate .bat file to run my program


System.setProperty("org.lwjgl.librarypath", new File(new File(System.getProperty("user.dir"),
				"native"), LWJGLUtil.getPlatformName()).getAbsolutePath());
		System.setProperty("net.java.games.input.librarypath", System.getProperty("org.lwjgl.librarypath"));

Also like i said, it works fine on 3 different computers now, just not on his. i have confirmed that he indeed has 64 bit windows.

could this be a service pack issue?(just a wild guess)

because i’ve had him redownload java both 32bit and 64 bit with little success

#10

There is the error. You are setting the library path to the “native” folder in the user directory. This expects the lwjgl dlls to exist in that folder but it can’t find the libraries at that location. So it throws a UnsatisfiedLinkError. Remove the code to set the properties and after exporting the jar, make sure you have the dlls in the same folder of the jar. That should solve the problem.

#11

hmmm still doesnt explain why it works fine on other comps but not his… i will def give this a shot but i dont think this is the problem . if you will download the zip and run the program your self so you can see how its set up it would be awesome :slight_smile: link is on the 3rd post;

#12

Didn’t work on my system too. I tested it on Mac OS X 10.8.5 64 bit and Windows 8 Pro 32 bit. Try the method I’ve said before.

#13

i made the changes you told me to make but i am unable to test it on my friends comp atm. Is there some reason that the other way does not work? i would really like to have the dlls inside the native folder hehe its the reason i chose that path in the first place.

UPDATE: ok so i woke him up got him to try it because it was killing me and he got the same error still.

#14

Maybe you are having missing some steps. Try these exactly.

  1. Change the code to set the properties to this, so it works when the files are in the ‘native’ folder.

System.setProperty("org.lwjgl.librarypath", new File(new File("native"), LWJGLUtil.getPlatformName()).getAbsolutePath());
System.setProperty("net.java.games.input.librarypath", System.getProperty("org.lwjgl.librarypath"));
  1. Go to “File -> Export -> Runnable Jar File” and export the JAR with “Extract required Libraries” selected.

  1. Then copy the natives folder from the LWJGL download archive next to the JAR you exported.
  2. Distribute the JAR along with the natives folder.

This should fix the problem.

#15

i did this and i will make him test it later on in the day. also . it doesnt work in macos because i didnt put the natives for macos in the native folder.
thanks for the feedback though :). i just hope it works.