I have an application that uses a jar. This jar depends on a dll, so I included the dll in a folder inside the eclipse project. The problem is that when I export the project with "Runnable jar file- > Package required libraries into generated JAR" it only exports the jar without the dll. Is there any way to do it correctly?
Important: I would like to distribute the packaged dll in the jar. It is more than likely that the users of my application do not have the installed dll.
Given the characteristics of your scenario:
The easiest way is to create an additional folder in your project, let's call it lib , place the DLL inside lib and then configure lib to be a folder that contains sources in the project. Consider that when you export a project as JAR, what Eclipse will do is pack all the components that are in the source code folders in the JAR. Here is an example of easy understanding.
In the source folder, we create a package and inside it a class that will be used to verify that the file was packaged with the JAR and that it can be accessed from within the Java classes. In this class the following code is added (package name and class are irrelevant for the example):
//JDK mínimo: 1.7. Si utilizas una versión anterior, adapta el código
public static void main(String[] args) {
//se prueba el acceso al archivo datos.txt desde dentro del jar
try (BufferedReader br = new BufferedReader(new InputStreamReader(Main.class.getClassLoader().getResource("datos.txt").openStream()))) {
System.out.println(br.readLine());
}catch (Exception e) {
e.printStackTrace(System.out);
}
}
Right click on the lib folder, select Build Path / Use as Source Folder
Export your Java project as Runnable Jar (Executable Jar). Give it as a name test-add-file.jar
Run the jar from your console. You should have a result similar to this:
For your particular case, instead of using a datos.txt file, you will use your DLL or any other resource you need in your project and be packaged along with the sources in your JAR.
You can register again the path where you have your .DLL file. In the menu, option Run > Run Configurations... > Arguments , add the path that contains your .DLL
