CI improvements

[vins-01]

1. JVM & Maven CLI Tuning

Create a .mvn/ directory in the project root to optimize the runner environment.

.mvn/jvm.config

Optimizes the JVM for short-lived CI tasks by reducing JIT overhead.

-XX:+TieredCompilation
-XX:TieredStopAtLevel=1
-Xverify:none

.mvn/maven.config

Reduces I/O and log storage by suppressing non-essential output.

--batch-mode
-Dorg.slf4j.simpleLogger.defaultLogLevel=warn
-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
-Dstyle.color=always

2. Compiler Optimization

Modify the root pom.xml to prevent redundant compilation caused by fresh CI file timestamps.

pom.xml

Add the staleMillis configuration to the maven-compiler-plugin.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <staleMillis>3600000</staleMillis>
    </configuration>
</plugin>

3. Parallel Test Execution

Enable concurrent execution for JUnit 5 tests. Place this in src/test/resources/ of the major modules (e.g., dspace-api).

junit-platform.properties

junit.jupiter.execution.parallel.enabled = true
junit.jupiter.execution.parallel.mode.default = concurrent
junit.jupiter.execution.parallel.mode.classes.default = concurrent

Note: For integration tests sharing a database, annotate classes with @execution(ExecutionMode.SAME_THREAD) to avoid race conditions.

4. GitHub Actions Workflow (.github/workflows/build.yml)

Optimize resource usage within the GitHub runner environment.

Artifact Retention

Limit the lifespan of intermediate artifacts to reduce data center storage.

- name: Upload Build Artifacts
  uses: actions/upload-artifact@v4
  with:
    name: compiled-classes
    path: "**/target/classes"
    retention-days: 1 # Green Tweak: Minimal storage footprint

Conditional Analysis

Execute heavy quality gates only on Pull Requests to save energy on every push.

jobs:
  analysis:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - run: mvn sonar:sonar

Summary of Technical Changes

Feature	File	Primary Benefit
JIT Optimization	jvm.config	Reduced CPU cycles on startup
Log Suppression	maven.config	Lower I/O and storage energy
Incremental Fix	pom.xml	Skips redundant recompilation
Parallelism	junit-platform.properties	Shorter wall-clock time
Retention Policy	build.yml	Reduced cloud storage waste
These changes should result in a leaner, faster, and more sustainable build process for your DSpace fork.

[vins-01]

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[vins01-4science]

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Created PR #4

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