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.
Related
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.
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 have a couple files I want to include in my .jar for a game server. The files, a SQLite database and an icon, work properly when and only when I put them in the Eclipse project folder and run it straight from Eclipse. As I want this to be distributable to end-users easily, how can I include these files and use them at runtime? Thanks in advance!
Accessing files from within a jar file can be tricky depending on the code that's using them. If the code is written to open a file from the file system, you have to extract it. If your Java code opens it with Class.getResourceAsStream(), it can be read from within the jar. You mentioned an icon and SQLite. I would guess you need to extract those files. I've done this with the maven-dependency-plugin and unpack when using maven. "jar xf foo.jar icon.gif" works too.
Right now i've written a simple SWT application using eclipse, and I want to pack it into an executable .jar file so I can give it out to friends and such. But I have the following problems:
-Right now i'm reading files by using their filename in the program, and putting them in the root folder of the eclipse project. That works fine for running in eclipse, but when I export to jar they're not in the jar. Is there a way to put them in the jar and access them in the code?
-I also need the SWT .jar dependencies or whatever its called(the files you need for SWT).
Does anyone know how to do this?
Take a look at ClassLoader.getResourceAsStream() API.
All you need to do is include these files in the with the source code of your project, then to have access to then have a look at this link