I built a Java application using Quarkus. Then I created the JAR file using mvn clean package Then I created a .Net Core console application and added the IKVM nuGet packages and also referenced the jar file in the csproj file:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="IKVM" Version="8.11.2" />
    <PackageReference Include="IKVM.ByteCode" Version="9.3.3" />
    <PackageReference Include="IKVM.Image" Version="8.11.2" />
    <PackageReference Include="IKVM.Image.JDK" Version="8.11.2" />
    <PackageReference Include="IKVM.Image.JRE" Version="8.11.2" />
    <PackageReference Include="IKVM.Maven.Sdk" Version="1.9.2" />
  </ItemGroup>

  <ItemGroup>
    <IkvmReference Include="dbexample-1.0.0.jar" >
      <AssemblyName>dbexample</AssemblyName>
      <AssemblyVersion>1.0.0</AssemblyVersion>
      <AssemblyFileVersion>1.0.0</AssemblyFileVersion>
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
      <Sources>DatabaseLib.class</Sources>
      <Debug>portable</Debug>
      <DelaySign>true</DelaySign>      
    </IkvmReference>
  </ItemGroup>
  
  <ItemGroup>
    <None Update="dbexample-1.0.0.jar">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>

</Project>

The problem is that the content of the JAR file is not being displayed in the .Net application, meaning that I cannot access their namespaces as well as classes and methods. I tried using another JAR file, the one coming with the "helloworld" example from IKVM, and it imported the JAR correctly.

I didn't use the IKVMC tool with the JAR file because whenever I try to use the tool with any JAR or DLL I get errors and I believe that the goal of that tool is to generate .Net Assemblies and is not needed to import the JAR into the .Net application. But maybe I'm wrong

I've read a lot of documentation regarding IKVM but I didn't make it work Could I miss something, specially in the Quarkus application that I should have done?

This is the Java application:

package com.example;

import .graalvm.nativeimage.IsolateThread;

public class DatabaseLib {
    public static void main(String[] args) {
        System.out.println("Hello from GraalVM 21! Main method from DatabaseLib");
    }

    public static String ConnectToDatabase(IsolateThread thread, int connect) {
        return "Hello from Quarkus DLL! " + String.valueOf(connect);
    }

    public static String DisconnectFromDatabase(IsolateThread thread) {
        return "Hello from Quarkus DLL!";
    }

    public static String DatabasePop(IsolateThread thread) {
        return "Hello from Quarkus DLL! DatabasePop";
    }
}

My thanks in advance

I tried importing another JAR file, from the IKVM example, the one called "helloworld" and it worked. I checked inside the generated JAR file and the namespace, as well as the methods were being exported, using the command:

jar tf risp-datalayer-app-1.0.0.jar