Github Actions Improvements

[darklight3it]

Issue #, if available:

N/A

Description of changes:

Fix multi-JDK test compatibility for UnsafeUtilTest and ClasspathLoaderTest in the Runtime Interface Client, and upgrade JUnit Jupiter from 5.9.2 to 5.14.3.

JUnit upgrade: 5.9.2 → 5.14.3.

CI workflow improvements:

• Restructured all 11 workflow files to follow "each workflow owns one module" philosophy with dependency-aware path triggers — when an upstream module changes, all downstream workflows trigger automatically.
• Added Maven dependency caching (actions/cache) to all workflows.
• Added workflow_dispatch to all workflows for manual triggering.

CI dependency graph for reference:

aws-lambda-java-core (no deps)
├── aws-lambda-java-log4j2
└── aws-lambda-java-runtime-interface-client (also depends on serialization)
aws-lambda-java-events (no deps)
├── aws-lambda-java-serialization
│ ├── aws-lambda-java-tests (also depends on events)
│ └── aws-lambda-java-runtime-interface-client (also depends on core)
├── aws-lambda-java-events-sdk-transformer
└── aws-lambda-java-tests (also depends on serialization)
samples (depends on events, serialization, tests)

Design principles:

• Each workflow builds and tests exactly one module.
• Each workflow triggers on changes to its own code and its upstream dependencies.
• No workflow builds downstream modules — that's the downstream workflow's job.
• All downstream workflows run in parallel when an upstream dependency changes.

Target (OCI, Managed Runtime, both):

Both

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.38%. Comparing base (c201b4d) to head (a365a00).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #594 +/- ##
=========================================
Coverage 65.38% 65.38% Complexity 211 211 =========================================
Files 34 34 Lines 988 988 Branches 142 142 =========================================
Hits 646 646 Misses 290 290 Partials 52 52 

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[M-Elsaeed]

Will this still pick the latest local changes If we make a change to one of the dependencies?

[darklight3it]

Yes. The key is an hash of the pom file, so if you are changing the POM you will cause the local cache to download the deps.

https://github.com/actions/setup-java#caching-packages-dependencies

This is not ultra useful because when we make our changes we usually change also the POM, however I read there should be also a partial hit cache.

So we would have at least cached the external dependencies. This is definitely a minor improvement. I will delve in build performance in following PRs.

[maxday]

by how much this is reducing the build time?

[darklight3it]

Not much, unfortunately a couple of seconds on the RIC. On the other you cannot even find it.

It is useful however for development if you want to test you changes with a github run.