JNBridgePro for Java developers
JNBridgePro generates Java proxies for your .NET classes so Java applications can use proven C# and .NET code directly. Keep the .NET code where it works, call it from Java, and avoid building a REST wrapper or JNI layer just to cross the runtime boundary.
Used by Boeing, Bank of America, IBM, Adobe, Oracle, Pfizer, and 600+ organizations.
Short answer
The practical ways to call C# from Java
You can bridge Java and .NET several ways. The right choice depends on whether you want a service boundary, a low-level native layer, or direct access to .NET objects from Java.
REST or gRPC wrapper
Expose .NET over a network API when the .NET code is already service-shaped. This adds deployment, serialization, and API maintenance work.
JNI/native glue or custom interop
Possible when you need native control, but it usually means more glue code, more testing, and more ownership of the bridge itself.
Java proxies for .NET classes
Generate proxies from your .NET assemblies, reference them in your Java project, and call C# from Java with normal object-oriented syntax.
How JNBridgePro works
From .NET assembly to Java call in three steps
Use this when the goal is reuse: validated C# services, business rules, numerical models, or .NET libraries that should not be rewritten.
Point at .NET assemblies
Select the .NET classes or assemblies your Java application needs to use.
Generate Java proxies
JNBridgePro creates Java proxy classes that represent the .NET classes.
Call C# from Java
Reference the proxy JAR and use .NET objects from your Java code.
Best fit
Use JNBridgePro when .NET needs to stay .NET.
This landing page is not a full tutorial. It is the fast path for teams that already know they have valuable C# or .NET code and need it working inside a Java workflow.
Reuse proven .NET logic
Keep tested C# algorithms, business rules, and .NET libraries intact while Java applications call them.
Avoid wrapper projects
Skip extra service layers when you do not need a network API just to connect two in-house runtimes.
Modernize incrementally
Bridge first, then decide later which .NET or Java components are actually worth rewriting.
Enterprise proof
Production .NET/Java integration, not a demo-only bridge
JNBridgePro is used by enterprise teams where cross-runtime integration has to survive real deployment constraints.
Organizations
Companies across finance, defense, pharma, software, healthcare, and manufacturing use JNBridge solutions.
Risk workflow reduced
A major financial institution connected Java applications with C# risk engines and reduced a key analysis workflow.
Validated code reused
Teams can preserve C# and .NET code that already passed years of business, numerical, or regulatory validation.
Need more detail?
Read deeper after you start the trial.
For engineers comparing approaches, these resources explain the tradeoffs. For implementation, the fastest next step is to try the bridge against your own .NET assemblies.
How to call C# from Java
A deeper technical guide for Java teams that need to call .NET and C# code.
Read the guide ->Calling .NET from Java: Javonet vs JNBridgePro
Compare generic runtime invocation with JNBridgePro’s generated-proxy model.
Compare options ->Call C# from Java: jni4net alternative
Modern Java-to-.NET integration context for teams evaluating older bridge options.
Read the guide ->Try it on your .NET code
Download JNBridgePro and call your first C# class from Java.
Use the trial to test the real question: whether your existing .NET library can be reused directly from your Java application without a rewrite.