Corn COBOL-to-Java Compiler — Downloads

Deterministic COBOL-to-Java modernization for organizations that cannot afford risky rewrites, vendor lock-in, or non-deterministic AI conversions.

This repository hosts the downloadable evaluation build of the Corn COBOL-to-Java compiler, a product of Cornmeister LLC. The source code is maintained privately; this page exists so you can evaluate the tool without a source checkout.

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Download

Grab the latest build from the Releases tab. Two formats:

• corn-cobol-to-java-1.0.0.msi — Windows installer (recommended). Bundles its own Java 21 runtime, so nothing else needs to be installed. Adds two Start Menu shortcuts under Cornmeister LLC:
  • Corn COBOL-to-Java — the command-line tool (translate, analyze, validate)
  • Corn Dashboard — launches the web UI at http://localhost:8085 in your browser
• corn-cobol-to-java-1.0.0.jar — single self-contained runnable JAR for macOS/Linux or anyone who already has Java 21+. No build, no dependencies.

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Quick start

Windows (MSI)

1. Run the MSI installer.
2. Launch Corn Dashboard from the Start Menu for the web UI, or Corn COBOL-to-Java for the command line.

Cross-platform (JAR)

# Show help
java -jar corn-cobol-to-java-1.0.0.jar --help

# Launch the web dashboard (UI) at http://localhost:8085
java -jar corn-cobol-to-java-1.0.0.jar dashboard

# Translate a COBOL program (or a directory of them) to Java
java -jar corn-cobol-to-java-1.0.0.jar translate ./cobol \
  --output ./output/java --codegen-level 2

# Analyze COBOL source (complexity, statement mix, feature detection)
java -jar corn-cobol-to-java-1.0.0.jar analyze ./cobol

# Validate the full pipeline (parse → generate → compile → execute)
java -jar corn-cobol-to-java-1.0.0.jar validate ./cobol \
  --output ./corn-validation

Verify your Java version first (JAR only — the MSI ships its own runtime):

java -version   # must report 21 or newer

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What it does

Corn translates ANSI-85 COBOL into maintainable Java through a deterministic compiler pipeline — the same input always produces the same output.

COBOL source
  → source normalization
  → COBOL parsing
  → internal representation
  → Java source generation
  → compile / execute / validate pipeline

That determinism matters when the system being migrated handles money, claims, records, taxes, benefits, logistics, or regulated data.

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NIST CCVS85 conformance

Corn is validated against the US government NIST CCVS85 COBOL-85 compiler conformance test suite.

• Parse acceptance: 415 / 415 (100%) — every program in the suite is accepted by the parser.
• Generated-Java compile rate: 368 / 415 (88.7%) — share of programs whose emitted Java compiles cleanly with javac.

These figures measure parse acceptance and Java generation. Generated Java should be reviewed, tested, and validated before production use.

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Licensing

This is an evaluation edition distributed under the Corn Evaluation License (see LICENSE). It is not open-source software and is not licensed for production use. Production deployment requires a separate commercial license from Cornmeister LLC.

The compiler source code is proprietary and maintained privately.

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Contact

Cornmeister LLC — for commercial licensing, production support, or the full enterprise platform (CICS → Spring Boot, SQL → JDBC, JCL → Spring Batch, execution tracing, portfolio analysis), reach out via the contact details in your evaluation agreement.