Apache Maven 3.0-RC1 was a release candidate announced for community testing before final release. This guide helps DevOps and build engineers run focused regression tests against Maven 2.x, compare outcomes, and report issues with enough detail for maintainers to reproduce.
Originally published on 2010-09-21; fully revised and updated.
What the original pre-release request asked testers to do
The Maven team asked the community to test Maven 3.0-RC1 and identify regressions compared with Maven 2.x. The expected contribution was to run real builds, capture unexpected behavior, and submit reproducible reports.
Before filing issues, testers were asked to review Maven 3.x compatibility guidance: https://cwiki.apache.org/confluence/display/MAVEN/Maven+3.x+Compatibility+Notes.
The original note also mentioned that fixes since the 3.0-beta-3 release could be reviewed in JIRA.
Pre-release regression testing workflow
flowchart TD
A[Select a Maven 2.x project] --> B[Read Maven 3.x compatibility notes]
B --> C[Run baseline build on Maven 2.x]
C --> D[Run same build on Maven 3.0 RC1]
D --> E{Behavior changed}
E -- No --> F[Record successful validation]
E -- Yes --> G[Capture logs and minimal reproducer]
G --> H[File JIRA issue]
F --> I[Share test summary]
H --> I
Side-by-side setup for Maven 2.x and Maven 3.0-RC1
Use isolated Maven installations so you can run identical commands against both versions without changing project code between runs.
Acquire and verify both Maven toolchains
# Replace placeholders with actual Apache release or archive URLs
curl -LO "<Maven-3.0-RC1-binary-URL>"
curl -LO "<Maven-2.x-binary-URL>"
tar -xzf apache-maven-3.0-RC1-bin.tar.gz -C /opt
tar -xzf apache-maven-2.x-bin.tar.gz -C /opt
export MAVEN2_HOME=/opt/apache-maven-2.x
export MAVEN3_HOME=/opt/apache-maven-3.0-RC1
$MAVEN2_HOME/bin/mvn -version
$MAVEN3_HOME/bin/mvn -versionCode language: PHP (php)Run identical builds and compare logs
cd /path/to/your-project
$MAVEN2_HOME/bin/mvn -e -X clean test > maven2.log 2>&1
$MAVEN3_HOME/bin/mvn -e -X clean test > maven3rc1.log 2>&1
diff -u maven2.log maven3rc1.log > maven-diff.txt
grep -n "ERROR" maven3rc1.logCode language: PHP (php)Maven 2.x baseline vs Maven 3.0-RC1 validation focus
| Area | Maven 2.x baseline | Maven 3.0-RC1 check |
|---|---|---|
| Lifecycle execution | Confirm normal clean, test, and package flow | Check for phase ordering or execution differences |
| Plugin behavior | Document plugin versions and expected output | Identify plugin compatibility or invocation changes |
| Dependency resolution | Capture resolved dependencies and scopes | Look for missing artifacts, conflicts, or scope changes |
| Multi-module builds | Record successful reactor build order | Check module ordering and failure propagation |
| Error diagnostics | Note known warnings and failure patterns | Flag new errors and attach full debug logs |
How to file a useful regression report in JIRA
If Maven 3.0-RC1 fails where Maven 2.x succeeds, file an issue in Apache JIRA with reproducible details: https://issues.apache.org/jira/.
- State the exact Maven versions tested (baseline and RC).
- Include OS and JDK details used during both runs.
- Provide the smallest possible project reproducer.
- Attach baseline and RC logs, plus a diff if available.
- Reference compatibility notes if behavior may be expected.
Summary: [Regression] Maven 3.0-RC1 fails build that passes on Maven 2.x
Environment: <OS>, <JDK>, Maven 2.x, Maven 3.0-RC1
Project: <minimal reproducer or sanitized sample>
Command: mvn -e -X clean test
Expected result: Same outcome as Maven 2.x baseline
Actual result: <error message and stack trace>
Attachments: maven2.log, maven3rc1.log, maven-diff.txtCode language: CSS (css)Best practices for release-candidate feedback
- Test real-world projects, not only sample applications.
- Keep Maven 2.x and RC runs as identical as possible.
- Always provide a reproducible command sequence.
- Attach complete logs collected with debug flags.
- Separate expected compatibility differences from true regressions by checking the official notes first.
I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.
I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.
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