I have made a Java game using LWJGL, which requires some native files. It all works fine in Eclipse. I want to include the .dll files inside a JAR file, but everytime I try, LWJGL can't find the natives. I have already tried using jarsplice or fatjar, but to no avail. I know minecraft is also programmed using LWJGL, and it somehow manages to load the natives from another folder.
Is there a way to package native files into a JAR file and let a 3rd party library, like LWJGL access them? If not, how would I approach loading them from an external folder?
EDIT: Somehow it worked with the natives in the same directory as the JAR file. I would still like some explanation and perhaps some other methods, though.
I just ran into this a few weeks ago. Alas, I do not have links, but I found that you cannot reference native files stored inside of a jar file. You have to either programatically extract them before you reference them, or you have to install them alongside your jar file.
I went with the second option and just have Eclipse pack the whole collection into a zip file for distribution.
For the first option, one place to look would be the source code for JNA. They ship dll's/binaries inside their jar file and extract then on demand.
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I recently got into LWJGL, and it's working fine in the IDE. But when I export my project to a JAR file, it's not working similarly to in the IDE.
I know how I can include my LWJGL JAR in the game JAR file, but I want the natives in there as well so people don't need to download lots of files to run my game.
How can I do this in IntelliJ?
When I run the JAR file, I get a java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path error. I know I can do -Djava.library-path="<path_to_native>", but I want my program to be easy-to-use for others. The easiest would be to just have one file - the JAR. So is it possible to get the natives inside the JAR? - how?
I have made a Java game using LWJGL, which requires some native files. It all works fine in Eclipse. I want to include the .dll files inside a JAR file, but everytime I try, LWJGL can't find the natives. I have already tried using jarsplice or fatjar, but to no avail. I know minecraft is also programmed using LWJGL, and it somehow manages to load the natives from another folder.
Is there a way to package native files into a JAR file and let a 3rd party library, like LWJGL access them? If not, how would I approach loading them from an external folder?
EDIT: Somehow it worked with the natives in the same directory as the JAR file. I would still like some explanation and perhaps some other methods, though.
I just ran into this a few weeks ago. Alas, I do not have links, but I found that you cannot reference native files stored inside of a jar file. You have to either programatically extract them before you reference them, or you have to install them alongside your jar file.
I went with the second option and just have Eclipse pack the whole collection into a zip file for distribution.
For the first option, one place to look would be the source code for JNA. They ship dll's/binaries inside their jar file and extract then on demand.
I'm currently writing a program dependent on LWJGL. Adding the library to my project was easy enough, but I'm having trouble exporting my project as a standalone JAR that the user can simply double-click for a finished product.
WHAT I HAVE TRIED:
File -> Project Structure... -> Modules -> Dependencies tab -> Add -> Jars or directories -> (insert path to natives here) -> Option "classes" in the dialog. -> Check the box under "Export"
DESIRED RESULT: A runnable JAR with no dependency on the command line to open properly. Other JARs and directories being included with my project are fine, but I'd like IntelliJ to export them WITH my project automatically if possible, so that I don't have to manually drag the needed files into the output directory and make a script to run the JAR with the correct natives.
I'm very new to IntelliJ, coming from Eclipse (although I never had to do this in Eclipse, either), and am still coming to grips with the new (to me) terminology used by the program. I'm sure there is a very easy solution I am just overlooking. Thank you in advance.
I was able to get around the issue by using JarSplice to make a Windows EXE that includes the natives within.
I also use IntelliJ, and I've had a similar issue. If you put your natives into a folder somewhere near you, use something like the following at the start of your public static void main method:
System.setProperty("org.lwjgl.librarypath", PATH_TO_LIBS);
Note that you may have to prepend System.getProperty("user.dir") to the front of PATH_TO_LIBS, I'm not certain.
ADDENDUM: You said you'd like any additional files to automatically be created with your jar? Check out IntelliJ's Artifacts. Go to project settings, select artifacts, and add one with the plus button. Once you get an artifact added you can mess around with the file structure on the side, adding in other folders (such as the natives folder, or a resources folders). Once you're done there, you can click Build>Artifacts and it automatically packages them for you, and puts them in a directory (which you can specify on the Artifact window).
I don't know what IntelliJ is so I'm not sure how helpful this will be, but I did do something like this with LWJGL a couple of years ago.
LWJGL depends on native libraries, and the operating system depends on loading those from real native files. You can't load them from inside a jar. So, you can put them in the jar, but you'll have to write some code (which runs before you try to call any LWJGL stuff) which will extract the needed native(s) from the jar at run time and save them in the system temporary directory (or wherever) then load them with System.load.
Then you have to remove/comment out the normal library loading code from org.lwjgl.Sys (the functions doLoadLibrary and loadLibrary). That should do it.
Edit: A similar question is here: How to make a JAR file that includes DLL files?
I did check the already answeared questions which have almost the same topic as this question but none of the answeared onces were able to solve my problem.
I have been searching now online for about 4 hours and tried soo many different things to solve my problem..
Im trying to make a Pong game in Java and now i wanted to export my project so i can send it to some friend so he can try it.
Im using LWJGL for this project so i do have some jars added to the referenced libraries, And the LWJGL.jar has the windows natives added which is included in the projects lib folder.
Here is an image of the project viewer:
Reason im posting this image is so you get an idea of that i have all the libraries inside the project aswell as the natives needed for the project to run.
While reading about why the jar didnt work i also read that you need a Manifest.mf file so i created one and inside this manifest file i have the following text:
Manifest-Version: 1.0
Main-Class: jGame.Main
Class-Path: lib/jars/asm-debug-all.jar lib/jars/jinput.jar lib/jars/lwjgl.jar lib/jars/izma.jar lib/jars/slick.jar
Also 2 empty lines underneath Class-Path since i heard u have to have that.
This project runs fine aslong as i run it in eclipse but when i export the project with either runnable jar or jar wizard in eclipse it doesn't start when i double click the .jar file so i went into the cmd and used this command:
java.exe -jar JGame.jar
And the following message was shown:
I have checked atleast 10 times that i provided the correct path for the main class.. And i dont know what to do anymore. In the eclipse wizard i have been trying both to export runnable jar and exporting normal jar but none of the two is working. Also in the wizards i have selected to export a normal jar not runnable since when i choose runnable the libraries get messed up because the lib folder gets replaced.
I tried opening the jar file as an archive and got the following:
In an attempt of using JarSplice i suceeded to solve the problem.
After reading this:
It's not going to work the way you're trying to currently do it, since you need to have the native files along side the jar and point
to them via the '-Djava.library.path' parameter.
If you just want a single jar and want to avoid the hassle of the
command line and native files use the JarSplice tool. JarSplice is
easy to use and will automatically handle the native file stuff for
you.
1) Simply export your project (class and resources) to a jar (easier
just to do it through your IDE).
2) Then run JarSplice, add all the jars you need to the jars tab (your
app jar, lwjgl.jar, and any other external jar you're using).
3)Then on the natives tab add all the natives files (windows *.dll,
linux *.so, mac *.dylib & *.jnilib).
4)On the class tab add your main class. Then create your jar.
You can then run this jar just by double clicking it (or if you wish
via command line using 'java -jar yourapp.jar').
I found this solution from this link: Can't start .jar file (using LWJGL)
Reason why it didnt work the first time were i didn't include the actual .jar file that was exported from eclipse while using JarSplice.
I am currently working on a game in Java and tried to export my first release as a runnable jar.
As Eclipse has a tool for this, I tried to use it.
After trying many different ways, I could still not launch the game. I made sure to export as a runnable jar and added the library.
My suspicions are as follows: The game's project is set up like this: src->package->code, Res->images and so on, JRE System Library, and finally referenced libraries->Slick2d, lwjgl, and jinput.
As it happens, I could find no way to get the jar to replicate the workspace folder organization. I believe that is what is causing it to crash; the required files are in unknown paths to the program.
I then tried to reorganize the files myself, only to be told that the jar is corrupted.
If anyone could please help by telling me what the issue may be, how to fix it, or any tips what-so-ever, I would be very thankful!
Use JarSplice to include the library, your jar and the natives in 1 jar.
It didn't work because natives and slick jars were missing.
eclipse comes with the option to package the required Jar along with the main Jar.