Need to reference and use a C# dll in Java

Question

I need to reference a .Net dll in java. I have used jni4net libraries for the same. I have followed the steps mentioned in the video below :

https://www.youtube.com/watch?time_continue=351&v=8OoSK_RWUe4

I have followed all the steps required to reference jni4net libraries but i get the following runtime Exception:

Exception in thread "main" java.lang.UnsatisfiedLinkError: orionforpython.DynamicOrion.__ctorDynamicOrion0(Lnet/sf/jni4net/inj/IClrProxy;)V
at orionforpython.DynamicOrion.__ctorDynamicOrion0(Native Method)
at orionforpython.DynamicOrion.<init>(DynamicOrion.java:25)
at com.orion.OrionForJava.main(OrionForJava.java:16)

After following all the steps, This is my code:

    package com.orion;
    import net.sf.jni4net.Bridge;
    import orionforpython.*;
    import java.io.*;
    class OrionForJava {
    public static void main(String[] args) throws IOException {
    Bridge.setVerbose(true);
    Bridge.init();
    File proxyAssemblyFile=new File("OrionForPython.dll");
    Bridge.LoadAndRegisterAssemblyFrom(proxyAssemblyFile);
    DynamicOrion orion=new DynamicOrion();
    String res=orion.ReqLogin("user", "pwd", "");
    System.out.print(res);
  }}

I have tried executing the same using NetBeans 8.1 IDE but with no success. I am using jni4net-0.8.8.0 version and Eclipse IDE for Java Developers Version: Oxygen.3 Release (4.7.3) Any assistance would be helpful!

Answer 1

I used jni4net library to call c# dlls from java and it is working fine. I used a lightly different approach to initialize jni4net.

try {
        Bridge.setVerbose(true);
        Bridge.init(new File("Full path to jni4net.n.w64.v40-0.8.8.0.dll"));
        // where dlls to load is jni4net.n.w64.v40-0.8.8.0.dll,jni4net.n-0.8.8.0.dll,MyOriginalNETDll.dll,MyOriginalNETDll.j4n.dll (after proxygen processing)
        for (String str : dllsToLoad) {
            File dll = new File(rutaDlls + str);
            Bridge.LoadAndRegisterAssemblyFrom(dll);
        }
    } catch (IOException e) {
        LOG.error("Error jniBrige.", e);
    }

I needed to use full path c:... to the dll to make it work. I also had to take care about .net framework version used to create assembly (need to use 4.0 in my case and java version 8)

Hopes this helps