Loading DLL in Java - Eclipse - JNI

Question

I am trying to load a dll in java using the following code System.loadLibrary(\"mydll\");

The project is placed in D:\\development\\project\\ and i have placed t

Answer 1

System.loadLibrary loads the DLL from the JVM path (JDK bin path).

If you want to load an explicit file with a path, use System.load()

See also: Difference between System.load() and System.loadLibrary in Java

public class MyClass
{
    static 
    {
        System.load("MyJNI.dll");
    }
}

Answer 2

One problem you have is: System.load("D:\mydll.dll"); should be System.load("D:\\mydll.dll"); or System.load("D:/mydll.dll");

I have had more success with System.load, but loadlibrary is better designed for multiplatform. It figures out the extension for you.

Answer 3

Put your Almafa.dll into the C:/Java/jre7/lib or /bin sorry, I can`t remember exactly. After you have done no more configuration needed, just say

static{ System.LoadLibrary("Almafa"); }

in the class, where you want to load it. It is works only in Java project, in Android like project you need to use JNI. I had posted now the result of 3 days no sleeping :)

Answer 4

I got my error resolved by using the following:

   static {
    try {
        System.loadLibrary("myDLL");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Instead of using System.load("myDLL.dll")

Answer 5

Where you specify the DLL filename in the library path, omit that. Additionally, your System.loadLibrary call should just be 'mydll'. I can tell you (from experience) that if you put the DLL in the root of your project in Eclipse (i.e., D:\Eclipse Workspace\Proj), it should work. Any further linker errors could be from dependency problems with finding other DLLs. The exception is the same. Use something like Dependency Walker (http://www.dependencywalker.com/) to see if your DLL relies on anything else not on the system library path.

Edit: UnsatisfiedLinkError: Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native -- it seems like you are using a JNI function which does not exist.

Answer 6

Check out how to properly set up the native dependencies here. Additionally, make sure you use the correct JVM: in my case, the DLL was not found because it was a 32 bit DLL, but I used the x64 JVM!