[PR] Fix NPE in DefaultLookup.lookupOptional() when container returns null [maven]

["gnodet (via GitHub)" <gi...@apache.org>]

gnodet opened a new pull request, #12336:
URL: https://github.com/apache/maven/pull/12336

   ## Summary
   
   - `PlexusContainer.lookup()` can return `null` instead of throwing `ComponentLookupException`. `DefaultLookup.lookupOptional()` wraps the result with `Optional.of()`, which throws `NullPointerException` on null input. Changed to `Optional.ofNullable()` so a null result is correctly represented as `Optional.empty()`.
   - This fixes `maven-jdeprscan-plugin` integration tests (`list-default`, `list-forremoval`) which fail on Maven 4.0.x because `DefaultToolchainManager.retrieveContext()` calls `lookupOptional(Project.class)` and the container returns null.
   
   ## Test plan
   
   - [x] Built `maven-jdeprscan-plugin` with this fix and verified all 6 integration tests pass (previously 2 failed with NPE)
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)
   
   _Claude Code on behalf of Guillaume Nodet_


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Re: [PR] Fix NPE in DefaultLookup.lookupOptional() when container returns null [maven]

["gnodet (via GitHub)" <gi...@apache.org>]

gnodet merged PR #12336:
URL: https://github.com/apache/maven/pull/12336


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