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.

UnsafeUtilTest — testDisableIllegalAccessWarning:

• The original test used setAccessible(true) (standard reflection) to verify a field that production code accesses via Unsafe — this broke on JDKs where the production code works fine.
• Silently passed on JDK 8 and 17+ through catch blocks, so it was never actually testing anything.
• Fix: replaced with Unsafe.getObjectVolatile/staticFieldOffset to mirror production code (no --add-opens needed), and added @EnabledForJreRange(min = JAVA_9, max = JAVA_16) since IllegalAccessLogger only exists on JDK 9-16.

ClasspathLoaderTest — testLoadAllClassesWithEmptyClasspath:

• On JDK 25, new File("").exists() now returns true (resolves to cwd) due to JDK-8024695. This means ClasspathLoader no longer throws FileNotFoundException for an empty classpath entry — it hits the directory-skip path instead.
• Fix: split into two JRE-ranged variants using @DisabledForJreRange(min = JAVA_25) / @EnabledForJreRange(min = JAVA_25).
• Reference: JDK 25: Consistent Behavior of 'new File("")'

JUnit upgrade: 5.9.2 → 5.14.3 to get JRE.JAVA_25 enum support for precise test targeting.

Tests verified passing on JDK 8, 11, 17, and 21.

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 JDK version matrix (8, 11, 17, 21, 25) to the RIC PR workflow.
• 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 (ac9e6e4) to head (2c29a69).
⚠️ 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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