Add DefaultLookupTest for lookupOptional NPE fix#12384
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Pull request overview
Adds a Maven Core regression test to ensure DefaultLookup.lookupOptional(...) continues to return Optional.empty() when the underlying PlexusContainer returns null (the behavior introduced by switching to Optional.ofNullable in #12336), preventing silent reintroduction of the prior NPE.
Changes:
- Introduces
DefaultLookupTestcovering bothlookupOptionaloverloads for thenull-return case. - Adds assertions for the “value present” case and for translation of
ComponentLookupExceptioncaused byNoSuchElementExceptiontoOptional.empty().
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| /** | ||
| * A {@link ComponentLookupException} whose cause is a {@link NoSuchElementException} signals an | ||
| * absent component and must be translated into an empty {@link Optional}. | ||
| */ | ||
| @Test | ||
| void lookupOptionalReturnsEmptyOnNoSuchElementCause() throws Exception { | ||
| ComponentLookupException cle = | ||
| new ComponentLookupException(new NoSuchElementException(), String.class.getName(), ""); | ||
| assertSame(NoSuchElementException.class, cle.getCause().getClass(), "test fixture precondition"); | ||
| when(container.lookup(String.class)).thenThrow(cle); | ||
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| Optional<String> result = lookup.lookupOptional(String.class); | ||
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| assertFalse(result.isPresent(), "expected empty Optional when component is absent"); | ||
| } |
The NPE fix for DefaultLookup.lookupOptional (apache#12336) — switching Optional.of to Optional.ofNullable so a null component lookup returns an empty Optional instead of throwing NullPointerException — shipped without a regression test. Add DefaultLookupTest in maven-core covering both lookupOptional overloads: null component -> empty Optional (the guarded NPE case), present component -> value, and a ComponentLookupException whose cause is NoSuchElementException -> empty. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds
DefaultLookupTest(maven-core) — the regression test that the NPE fix in #12336 shipped without.Why
#12336 changed
DefaultLookup.lookupOptional(...)to useOptional.ofNullableinstead ofOptional.of, so anullcomponent lookup returns an emptyOptionalinstead of throwingNullPointerException. Nothing currently guards that behavior — reverting the fix goes undetected by the suite.Test
DefaultLookupTestcovers bothlookupOptionaloverloads:null-> emptyOptional(the guarded NPE case)OptionalComponentLookupExceptionwhose cause isNoSuchElementException-> emptyVerified locally: green on current master; reverting
ofNullable->ofturns the two null-case tests red with the NPE fromjava.util.Optional.of. No production code change.