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Advanced .NET Core Hosting Demo

This project demonstrates a possible way for a Java process to host .NET Core using the nethost library. Documentation on the nethost library can be found here.

Key Features

Demonstrates how to locate and initialize .NET Core 3.0 from a non-.NET Core process and subsequently load and call into a .NET Core assembly.

Addtional comments are contained in source and project files.

Requirements

  • .NET Core 3.0 (At least Preview 7) - https://dot.net

  • Java JDK - https://jdk.java.net/

    • The bitness and platform of the install JDK should match the RID of the installed .NET Core 3.0. For example, if the user installed the 64-bit Windows .NET Core 3.0 SDK, then the JDK should also be the 64-bit Windows version.

  • CMake - https://cmake.org/

Build and Run

  1. In order to build and run, all requirements must be installed. The following must also be done:

    • The JDKRoot property in ./Directory.Build.props should be updated.

    • The cmake binary must be on the path.

  2. Navigate to the root directory and run dotnet build.

  3. Navigate to the output directory for the configuration (i.e. Debug is the default).

    • Windows: cd bin\Debug

    • Non-Windows: cd bin/Debug

  4. Run the Java entry point. If the java binary is not on the path, the below command should be updated with the absolute path to the java command instead.

    • java JavaHost

The expected output will come from the DotNetLib class library.

Scenario pain points

See the dotnetbridge.c for examples on how to mitigate each of the following:

  • The nethost.h should include defines for the .runtimeconfig.json extension

  • API defintions for calling conventions instead of looking through documentation

  • Helper macros for narrow vs wide characters. These are provided on Windows via the T() macros