JNBridgePro for .NET developers
JNBridgePro generates .NET proxies for your Java classes so C# applications can use proven Java code directly. Keep the Java where it works, call it from .NET, 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 Java from C#
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 Java objects from C#.
REST or gRPC wrapper
Expose Java over a network API when the Java code is already service-shaped. This adds deployment, serialization, and API maintenance work.
JNI 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.
.NET proxies for Java classes
Generate proxies from your Java classes or JARs, reference them in your .NET project, and call Java from C# with normal object-oriented syntax.
How JNBridgePro works
From Java library to C# call in three steps
Use this when the goal is reuse: validated Java algorithms, business rules, numerical models, or vendor libraries that should not be rewritten.
Point at Java classes
Select the Java classes or JARs your .NET application needs to use.
Generate .NET proxies
JNBridgePro creates .NET proxy assemblies that represent the Java classes.
Call Java from C#
Reference the proxy assembly and use Java objects from your C# code.
Best fit
Use JNBridgePro when Java needs to stay Java.
This landing page is not a full tutorial. It is the fast path for teams that already know they have valuable Java code and need it working inside a .NET workflow.
Reuse proven Java logic
Keep tested Java algorithms, business rules, and domain libraries intact while .NET 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 Java or .NET components are actually worth rewriting.
Enterprise proof
Production Java/.NET 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 infrastructure with C# risk engines and reduced a key analysis workflow.
Validated code reused
Teams can preserve Java 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 Java classes.
How to call Java from C#
A deeper technical guide with more detail on approaches and tradeoffs.
Read the guide ->Run a Java JAR from C# and .NET
Compare five ways to use a Java JAR from a .NET application.
Read the guide ->Use Java libraries in .NET Core
More detail for teams bringing existing Java libraries into modern .NET.
Read the guide ->Try it on your Java code
Download JNBridgePro and call your first Java class from C#.
Use the trial to test the real question: whether your existing Java library can be reused directly from your .NET application without a rewrite.