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Bridge Java and .NET Without Migration

.NET and Java power enterprise applications worldwide. What happens when you need both?

❌ Traditional approach:

Costly rewrites ($200K-$2M), REST APIs with network overhead, or risky migrations

βœ… JCOBridge approach:

Direct in-process integration. Call Java from .NET (or vice versa) as if they were the same platform. Zero serialization, type-safe APIs, production performance.

Why JCOBridge?

Support Legacy Systems

  • Java 8-25 fully supported (64% of enterprises still use Java 8)
  • Integrate without upgrading – Java 17 JVM runs Java 8 bytecode seamlessly
  • Save typical migration costs of $200K-$2M per project

True In-Process Integration

  • Native JNI-based communication, not REST/gRPC
  • Zero-copy memory sharing for maximum performance
  • Type-safe generated wrappers for all APIs

Maximize Code Reuse

  • Share purchased libraries across Java and .NET teams
  • Access Java-only devices/modules from .NET (or vice versa)
  • Modernize gradually – no “big bang” rewrites needed

Common Use Cases:

  • 🏦 Finance: Integrate Java 8 core banking with .NET fraud detection
  • 🏭 Manufacturing: Bridge Java MES systems with .NET cloud analytics
  • πŸ›οΈ Government: Modernize certified Java 8 apps without recertification
  • πŸ“Š Enterprise: Add ML.NET AI to existing Java applications

Backward Compatible by Design

Using Java 17 JVM? Your Java 8 code still works. Mix bytecode versions seamlessly – no migration required for legacy modules.

Explores available features or go directly to the getting started page.

Advantages and Benefits

⭐ Now Supporting Java 8

Legacy Integration Without Migration

70% of enterprises still run Java 8 in production. JCOBridge enables integration with modern .NET applications without requiring costly Java upgrades.

  • βœ… Save $200K-$2M in typical migration costs
  • βœ… Deploy in weeks instead of months
  • βœ… Zero changes to existing Java 8 code
  • βœ… Low risk – keep proven, stable systems
Learn About Java 8 Integration β†’
Supported Java Versions
β˜• Java 8 (2014-2030) ⭐
β˜• Java 11 (LTS)
β˜• Java 17 (LTS)
β˜• Java 21 (LTS)
β˜• Java 25 (LTS)

Oracle Extended Support until Dec 2030


Fast &
Cyber-safe

Fast and Cyber-safe by design: no marshalling, no proxies, no custom channels to connect .NET and JVM. JCOBridge reaches the maximum theoretical speed and safety.


Minimize
TTM

Reduce time to market eliminating long and dangerous software portings. With JCOBridge you can use your Java code from .Net applications and vice versa.


Reuse
code

If you have a well working software library you can use it in every software platform.


Avoid
staffing

If your new project need to be deployed in a different platform you don’t need to do staffing, you can develop most of it in your reference platform, and deploy it on the customer required platform.


Save
money

Avoid costly migrations:

  • Java 8 β†’ Java 17 migration: $200K-$2M per project
  • 6-18 months timeline typical
  • High risk of breaking changes

JCOBridge alternative: Integrate Java 8 with modern .NET without upgrading Java. Save months of work and significant migration budget.


Reduce
risks

The less the involved development, the less the business risk. With JCOBridge you can develop less and reuse more.


Increase
market

In a world divided between two main technology platform, gaining instantaneous access to a technology can double your customer base in a single shot.

Versions and Features



Version 2.5.*

  • Support .NET 4.6.2+, 6, 8 (2.5.9+) and 9 (2.5.18+)
    • .NET 6, 8 and 9 host for Windows, Linux and MacOS (other platforms are available on demand)
    • .NET 7 removed from version 2.5.12
    • Windows ARM removed in .NET 6 (2.5.18+), 8 (2.5.14+)
    • Added MacOS from version 2.5.15, 2.5.18+ supports only MacOS 13+
  • Support any JVM 11+
  • Simplified wrapping of Java classes from .NET
  • Speed improvements by 40%
  • License model upgrade to actively support community: it is possible to use online requests together with file based licensing
  • Other features

Version 2.6.*

  • Support .NET 4.6.2+, 8, 9 and 10: .NET 8/9/10 host for Windows, Linux and MacOS (other incompatible platforms are available on demand)
  • Support any JVM from 8 to latest
  • Simplified wrapping of Java classes from .NET
  • Speed improvements by 40%
  • License model reviewed to better support community: the product can be used without restrictions if its usage does not produce any income
  • Other features

Version 3.0.*

Coming soon: we are re-engineering JCOBridge

  • Will support .NET 4.6.2+ and .NET 8+
  • Support any JVM from 8 to latest
  • Other features

Products

JCOBridge Core

The main core engine is available on

Explore some products based on JCOBridge


.NET Products



JNet

The github repository contains the full disclosed source of JNet: Java/JVM suite for .NET. A comprehensive suite of libraries and tools to use Java/JVM APIs (Java, Scala, Kotlin, …) and .NET side-by-side.

Go to repo


KNet

The github repository contains the full disclosed source of KNet: The Apache Kafka .NET suite. KNet is a comprehensive .NET suite for Apache Kafka providing all features: Producer, Consumer, Admin, Streams, Connect, backends (ZooKeeper and Kafka).

Go to repo


KNet OPC

The Apache Kafka connector for OPC-UA protocol, it is based on KNet Connect SDK.

Ask more info


KEFCore

The github repository contains the full disclosed source of KEFCore: the EntityFrameworkCore provider for Apache Kafka based on KNet.

Go to repo


NetPDF

The github repository contains the full disclosed source of NetPDF: the PDFBox suite for .NET.

Go to repo


JVM Products



JCOReflector

The github repository contains the full disclosed source of JCOReflector: a tool able to reflect .NET classes in Java (JVM) to simplify the use of .NET from Java or any other JVM enabled language.

Go to the repo


NuReflector

The github repository contains the full disclosed source of NuReflector: a tool able to produce Maven artifacts from NuGet packages. It is based on JCOReflector Engine.

Go to the repo

Public support information


GitHub

The github repository is the new public site where public issues can be reported.

Go to issues


Stack Overflow

Public questions can be requested on Stack Overflow site: use the tag #jcobridge within your question.

Go to…