fix(QTDI-2489): Apply default value before required validation for absent keys

[thboileau]

Requirements

• Any code change adding any logic MUST be tested through a unit test executed with the default build
• Any API addition MUST be done with a documentation update if relevant

Why this PR is needed?

Fixes QTDI-2489.

When a connector author adds a new @Required + @DefaultValue field to an existing connector, the TCK framework was throwing IllegalArgumentException because @Required validation fired on the raw config map before @DefaultValue was applied to absent keys. Existing serialized configurations (missing the new key) caused a false-positive validation failure.

Root cause: In ReflectionService.PayloadValidator.onParameter, the required-field check compared the raw value against JsonValue.NULL without first checking whether a default was declared. For newly added fields absent from a stored config, PayloadMapper delivers JsonValue.NULL — the validation fired even though the declared default would have been applied moments later.

What does this PR add (design/code thoughts)?

One-line guard in PayloadValidator.onParameter:

// BEFORE
if (Boolean.parseBoolean(meta.getMetadata().get("tcomp::validation::required"))
        && value == JsonValue.NULL) {
    errors.add(MESSAGES.required(meta.getPath()));
}

// AFTER
if (Boolean.parseBoolean(meta.getMetadata().get("tcomp::validation::required"))
        && value == JsonValue.NULL
        && meta.getMetadata().get("tcomp::ui::defaultvalue::value") == null) {
    errors.add(MESSAGES.required(meta.getPath()));
}

The tcomp::ui::defaultvalue::value metadata key is set by UiParameterEnricher when @DefaultValue is present. When it is non-null, we suppress the required-field error — the default will be applied later in the object factory chain. When it is absent, the existing behaviour is preserved: a genuinely missing required field still throws.

Tests added (5 new tests in ReflectionServiceTest):

Test	What it verifies
validationRequiredWithDefaultValueMissingKeyPasses	Missing key + @DefaultValue → no exception
validationRequiredWithDefaultValueResolvedValue	Missing key + @DefaultValue("DEFAULT") → resolved value equals "DEFAULT"
validationRequiredNoDefaultValueMissingKeyFails	Missing key + no @DefaultValue → IllegalArgumentException (regression)
validationRequiredWithEmptyDefaultValuePasses	Missing key + @DefaultValue("") → no exception
validationRequiredMultipleAbsentDefaultsPasses	Multiple missing keys all with defaults → no exception

All 50 tests in ReflectionServiceTest pass (45 pre-existing + 5 new).

AI generated code

https://internal.qlik.dev/general/ways-of-working/code-reviews/#guidelines-for-ai-generated-code

• this PR has been written with the help of GitHub Copilot or another generative AI tool

[thboileau]

🔍 Scope & Design Review — QTDI-2489 (Round 1)

Verdict: APPROVED — zero Blocker/Major findings.

Finding	Severity	Detail
Metadata key tcomp::ui::defaultvalue::value	None	Verified from UiParameterEnricher and StreamingLongParamBuilder
Explicit-null vs absent-key	None	PayloadMapper delivers JsonValue.NULL only for absent map keys; explicitly null entries don't occur in Map<String,String> configs
AC1 — default suppresses required error	None	Guard correctly fires when required AND absent AND defaultvalue declared
AC2 — present key path unchanged	None	value != JsonValue.NULL bypasses guard entirely
AC3 — genuinely missing required field still fails	None	@DefaultValue absent → get(...) == null is true → error fires as before
AC4 — no migration handler required	None	Fix confined to validation layer; no connector change needed
@DefaultValue on complex types	Info	Annotation is primitive-only per Javadoc; TCK maven plugin enforces at build time — no runtime risk
Test coverage	None	5 new tests cover all ACs plus empty-string and multi-absent edge cases

Fixes applied in Round 1: None.

---

Review performed by AI (GitHub Copilot). Human reviewer should verify the guard condition and test coverage.

[thboileau]

✅ Compliance Check — QTDI-2489

Verdict: PASS — no compliance violations.

Files reviewed

1. component-runtime-manager/src/main/java/org/talend/sdk/component/runtime/manager/reflect/ReflectionService.java
2. component-runtime-manager/src/test/java/org/talend/sdk/component/runtime/manager/ReflectionServiceTest.java

Findings

Rule	File	Severity	Status
Spotless formatting	Both	—	PASS — auto-applied before commit
Checkstyle	Both	—	PASS — 0 violations
No wildcard imports	Test	—	PASS — specific import added
JUnit 5 — no public on @Test	Test	—	PASS — default visibility on all 5 new methods
Scope discipline	Both	—	PASS — all changes traceable to approved plan
Test level (UT)	Test	—	PASS — pure framework logic, UT correct
Test scope coverage	Test	—	PASS — all 5 items from test scope covered
No deprecated API usage	Both	—	PASS — no deprecated APIs called
No opportunistic refactoring	Both	—	PASS — minimal required change only

Severity summary

Severity	Count
Critical fixed	0
Warnings	0
Info	0

[thboileau]

Following Sonar comment: reduce method complexity. Each block has been extracted as a method

[sonar-rnd]

Quality Gate failed

• 0.00% Coverage on New Code (is less than 80.00%)

Project ID: org.talend.sdk.component:component-runtime

View in SonarQube

[thboileau]

Issue with Sonar -> https://qlik-dev.atlassian.net/browse/QTDI-2489?focusedCommentId=1172248
let's wait for the next release of TCK (should reset the base reference of Sonar), and rerun Sonar CI then.