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Spike: decouple frontend from default backend build and split CI triggers by surface area #687

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d933946
Initial plan
Copilot May 23, 2026
067ab5f
decouple frontend bundling from default backend build
Copilot May 23, 2026
1f4c9ac
Merge branch 'main' into copilot/move-frontend-code-repo
conorheffron Jun 7, 2026
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8 changes: 8 additions & 0 deletions .github/workflows/maven.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,16 @@ permissions:
on:
push:
branches: [ "main" ]
paths-ignore:
- "frontend/**"
- ".github/workflows/node.js.yml"
- ".github/workflows/npm-publish-packages.yml"
pull_request:
branches: [ "main" ]
paths-ignore:
- "frontend/**"
- ".github/workflows/node.js.yml"
- ".github/workflows/npm-publish-packages.yml"

jobs:
build:
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8 changes: 8 additions & 0 deletions .github/workflows/node.js.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,16 @@ permissions:
on:
push:
branches: [ "main" ]
paths:
- "frontend/**"
- ".github/workflows/node.js.yml"
- ".github/workflows/npm-publish-packages.yml"
pull_request:
branches: [ "main" ]
paths:
- "frontend/**"
- ".github/workflows/node.js.yml"
- ".github/workflows/npm-publish-packages.yml"

jobs:
build:
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13 changes: 12 additions & 1 deletion README.md
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Expand Up @@ -238,11 +238,16 @@ aws sts get-session-token
![ui-config-screenshot](screen-grabs/local-ui-proxy.png)

## Run after project checkout (JDK 25 & Maven 4 required)
### Build frontend & server side, along with Java Code Coverage report.
### Build server side (backend only), along with Java Code Coverage report.
```shell
./mvnw clean package -U
```
Comment on lines +241 to 244

### Optional: bundle frontend into backend artifact (legacy single-repo flow)
```shell
./mvnw clean package -U -DbundleFrontend=true
```

#### View Java Code Coverage reports in Browser or Preview tab in IDE.
##### Path to reports is `target/site/jacoco/index.html`

Expand All @@ -266,6 +271,12 @@ npm run test

npm run test:coverage
```

## Frontend/backend split (spike output)
- Backend CI (`maven.yml`) now ignores frontend-only changes.
- Frontend CI (`node.js.yml`) now runs only for frontend/workflow changes.
- Backend Maven builds are backend-only by default; frontend bundling is opt-in via `-DbundleFrontend=true`.
- Recommended deployment coordination: publish backend and frontend with the same semantic version and promote both only after compatibility checks.
##### See the output below to verify the frontend test suite results.
![react-tests](screen-grabs/react-tests.png)

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138 changes: 77 additions & 61 deletions pom.xml
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Expand Up @@ -449,67 +449,6 @@
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.5.0</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>process-classes</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/classes/static</outputDirectory>
<resources>
<resource>
<directory>${basedir}/frontend/build</directory>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.github.eirslett</groupId>
<artifactId>frontend-maven-plugin</artifactId>
<version>${frontend-maven-plugin.version}</version>
<configuration>
<workingDirectory>frontend</workingDirectory>
<installDirectory>target</installDirectory>
</configuration>
<executions>
<execution>
<id>install node and npm</id>
<goals>
<goal>install-node-and-npm</goal>
</goals>
<configuration>
<nodeVersion>${node.version}</nodeVersion>
<npmVersion>${npm.version}</npmVersion>
</configuration>
</execution>
<execution>
<id>npm install</id>
<goals>
<goal>npm</goal>
</goals>
<configuration>
<arguments>install</arguments>
</configuration>
</execution>
<execution>
<id>npm run build</id>
<goals>
<goal>npm</goal>
</goals>
<configuration>
<arguments>run build</arguments>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
Expand All @@ -536,4 +475,81 @@
</plugin>
</plugins>
</build>

<profiles>
<profile>
<id>bundle-frontend</id>
<activation>
<property>
<name>bundleFrontend</name>
<value>true</value>
</property>
</activation>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.5.0</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>process-classes</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/target/classes/static</outputDirectory>
<resources>
<resource>
<directory>${basedir}/frontend/build</directory>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.github.eirslett</groupId>
<artifactId>frontend-maven-plugin</artifactId>
<version>${frontend-maven-plugin.version}</version>
<configuration>
<workingDirectory>frontend</workingDirectory>
<installDirectory>target</installDirectory>
</configuration>
<executions>
<execution>
<id>install node and npm</id>
<goals>
<goal>install-node-and-npm</goal>
</goals>
<configuration>
<nodeVersion>${node.version}</nodeVersion>
<npmVersion>${npm.version}</npmVersion>
</configuration>
</execution>
<execution>
<id>npm install</id>
<goals>
<goal>npm</goal>
</goals>
<configuration>
<arguments>install</arguments>
</configuration>
</execution>
<execution>
<id>npm run build</id>
<goals>
<goal>npm</goal>
</goals>
<configuration>
<arguments>run build</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>
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