jni4net is an open-source, intra-process bridge designed to enable direct, high-performance interoperation between Java (JVM) and .NET (CLR). It eliminates the need for heavyweight network protocols or REST APIs by allowing both runtime environments to share data and call each other’s code within a single operating system process. Key Features of jni4net
Bi-directional calls: You can invoke .NET assemblies from Java and call Java JARs from .NET.
Low latency: Data remains in the same memory space, preventing network serialization bottlenecks.
Automated code generation: It includes a command-line utility called proxygen.exe that analyzes compiled code and generates proxy wrappers for both platforms automatically. Connecting .NET and Java (Step-by-Step)
The typical development lifecycle with jni4net relies on generating proxy assemblies. Here is how to call a .NET C# DLL inside a Java application: 1. Setup the Environments
Make sure your environment variables match. You need a properly set JAVA_HOME pointing to your JDK. Ensure your application architectures match (e.g., both runtimes must be 64-bit or both 32-bit) to avoid initialization errors. 2. Create the .NET Assembly
Build a standard C# Class Library project and compile it into a DLL (e.g., MyDotNetLibrary.dll). 3. Generate Proxies via Proxygen
Download the jni4net release package. Use the bundled tool to parse your C# DLL and build the matching Java proxy files: proxygen.exe MyDotNetLibrary.dll /out:workDir Use code with caution. Java interoperation with a .NET DLL using jni4net
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