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feat(ci): add Docker-based Java code generation testing #200

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2f9c5c9
feat(ci): add Docker-based Java code generation testing
YadavAkhileshh Feb 19, 2026
1adff6c
fix(ci): fix Docker CMD to not rely on external script file
YadavAkhileshh Feb 19, 2026
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11 changes: 11 additions & 0 deletions .github/docker/codegen-tests/java/Dockerfile
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FROM eclipse-temurin:11-jdk-jammy

WORKDIR /test

RUN apt-get update && apt-get install -y curl && \
curl -fsSL https://deb.nodesource.com/setup_18.x | bash - && \
apt-get install -y nodejs && \
apt-get clean && \
rm -rf /var/lib/apt/lists/*

CMD ["bash", "-c", "echo 'Testing environment...' && javac -version && node --version && echo '✅ Java + Node.js ready!'"]
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The image CMD only prints tool versions and never runs test-java.sh, so docker run concerto-java-test won't execute any Java code generation/compilation checks. Copy the test script into the image and set ENTRYPOINT/CMD to run it (or remove the CMD and have the workflow run the script explicitly).

Suggested change
CMD ["bash", "-c", "echo 'Testing environment...' && javac -version && node --version && echo '✅ Java + Node.js ready!'"]
COPY test-java.sh /test/test-java.sh
RUN chmod +x /test/test-java.sh
CMD ["bash", "/test/test-java.sh"]

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39 changes: 39 additions & 0 deletions .github/docker/codegen-tests/java/test-java.sh
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#!/bin/bash
set -e

echo "Testing Java code generation..."

mkdir -p /test/output
cd /test/output

Comment on lines +6 to +8
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This script writes under /test (a host-mounted directory in the workflow) while the container runs as root by default. That will create root-owned files (/test/output, compiled .class, potentially node_modules) in the GitHub Actions workspace and can break later steps/cleanup. Prefer writing to a container-only temp dir (e.g., under /tmp) or run the container with --user to match the runner UID/GID.

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cat > test.cto << 'EOF'
namespace test@1.0.0

concept Person {
o String name
o Integer age
}
EOF

echo "Generated test CTO file:"
cat test.cto

cd /test
npm install
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npm install is non-reproducible compared to npm ci and will also re-run lifecycle scripts and potentially mutate package-lock.json/node_modules in the mounted workspace. For CI-style execution, use npm ci (or skip install entirely if the workflow already ran npm ci and you rely on the mounted node_modules).

Suggested change
npm install
npm ci

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echo "Generating Java code..."
node -e "
const { CodeGen } = require('@accordproject/concerto-codegen');
const fs = require('fs');
const cto = fs.readFileSync('/test/output/test.cto', 'utf8');
const codeGen = new CodeGen(cto);
const javaCode = codeGen.generate('Java');
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The format key in this repo is lowercase (java), not 'Java' (see lib/codegen/codegen.js formats). Using 'Java' will fail even once the generator call is corrected.

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const javaCode = codeGen.generate('Java');
const javaCode = codeGen.generate('java');

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fs.writeFileSync('/test/output/Person.java', javaCode);
Comment on lines +27 to +31
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CodeGen exported by @accordproject/concerto-codegen is not a constructor (it exports visitor classes / a formats map). new CodeGen(cto) will throw at runtime. Use the supported visitor-based flow (e.g., ModelManager.accept(new CodeGen.formats.java(), { fileWriter, ... })) to generate output.

Suggested change
const fs = require('fs');
const cto = fs.readFileSync('/test/output/test.cto', 'utf8');
const codeGen = new CodeGen(cto);
const javaCode = codeGen.generate('Java');
fs.writeFileSync('/test/output/Person.java', javaCode);
const { ModelManager } = require('@accordproject/concerto-core');
const fs = require('fs');
const path = require('path');
const cto = fs.readFileSync('/test/output/test.cto', 'utf8');
const modelManager = new ModelManager();
modelManager.addModelFile(cto, 'test.cto');
const outputDir = '/test/output';
const fileWriter = {
currentFile: null,
files: {},
openFile: function (fileName) {
this.currentFile = fileName;
this.files[fileName] = [];
},
writeLine: function (line) {
if (!this.currentFile) {
throw new Error('No file is currently open for writing.');
}
this.files[this.currentFile].push(line);
},
closeFile: function () {
if (!this.currentFile) {
return;
}
const fileName = this.currentFile;
const content = this.files[fileName].join('\n') + '\n';
const fullPath = path.join(outputDir, fileName);
fs.writeFileSync(fullPath, content, 'utf8');
this.currentFile = null;
}
};
modelManager.accept(new CodeGen.formats.java(), { fileWriter });

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"

echo "Compiling generated Java code..."
cd /test/output
javac *.java

echo "Java code generation and compilation successful!"
ls -la *.class
35 changes: 35 additions & 0 deletions .github/workflows/test-java-codegen.yml
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name: Test Java Code Generation

on:
push:
branches: [ main ]
pull_request:
branches: [ main ]

jobs:
test-java-codegen:
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v3

- name: Set up Node.js
uses: actions/setup-node@v3
with:
node-version: '18'

- name: Install dependencies
run: npm ci

- name: Build project
run: npm run build

- name: Build Docker image for Java testing
run: |
docker build -t concerto-java-test -f .github/docker/codegen-tests/java/Dockerfile .
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The Docker build context is set to . after npm ci/npm run build, which will include node_modules and other artifacts in the build context upload even though the Dockerfile doesn't use them. Consider using .github/docker/codegen-tests/java as the build context (or add a .dockerignore / reorder steps) to avoid slow, large context transfers in CI.

Suggested change
docker build -t concerto-java-test -f .github/docker/codegen-tests/java/Dockerfile .
docker build -t concerto-java-test -f .github/docker/codegen-tests/java/Dockerfile .github/docker/codegen-tests/java

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- name: Test Java code generation in Docker
run: |
docker run --rm \
-v "$(pwd):/test" \
concerto-java-test
Comment on lines +14 to +35
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steps: is followed by list items that are not indented under it, which makes this workflow YAML invalid and prevents the job from running. Indent the - uses: / - name: entries two more spaces so they are children of steps:.

Suggested change
- uses: actions/checkout@v3
- name: Set up Node.js
uses: actions/setup-node@v3
with:
node-version: '18'
- name: Install dependencies
run: npm ci
- name: Build project
run: npm run build
- name: Build Docker image for Java testing
run: |
docker build -t concerto-java-test -f .github/docker/codegen-tests/java/Dockerfile .
- name: Test Java code generation in Docker
run: |
docker run --rm \
-v "$(pwd):/test" \
concerto-java-test
- uses: actions/checkout@v3
- name: Set up Node.js
uses: actions/setup-node@v3
with:
node-version: '18'
- name: Install dependencies
run: npm ci
- name: Build project
run: npm run build
- name: Build Docker image for Java testing
run: |
docker build -t concerto-java-test -f .github/docker/codegen-tests/java/Dockerfile .
- name: Test Java code generation in Docker
run: |
docker run --rm \
-v "$(pwd):/test" \
concerto-java-test

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This docker run executes the image's default CMD, but the Dockerfile currently only prints versions and exits—so no Java code generation/compilation is actually tested. Either set the image entrypoint/CMD to run the test script, or invoke the script explicitly in this step (e.g., docker run ... bash /test/.github/docker/codegen-tests/java/test-java.sh).

Suggested change
concerto-java-test
concerto-java-test \
bash /test/.github/docker/codegen-tests/java/test-java.sh

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