Fix return types of substitutions

[zakkak]

Resolves issues with new strict checking introduced with oracle/graal#7340 (expected to land in GraalVM for JDK 22)

Openning as draft till the CI run on my fork completes.

[zakkak]

cc @jerboaa

[jerboaa]

LGTM. This GraalVM change turned all our CI red. Good there is already a fix. Thumbs up!

[quarkus-bot]

Failing Jobs - Building 4319465

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✖	JVM Tests - JDK 11	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 17
✔️	JVM Tests - JDK 20
✔️	Maven Tests - JDK 11
✖	Maven Tests - JDK 11 Windows	Build	Failures	Logs	Raw logs

Full information is available in the Build summary check run.

Failures

⚙️ JVM Tests - JDK 11 #

- Failing: integration-tests/container-image/maven-invoker-way 

📦 integration-tests/container-image/maven-invoker-way

✖ Failed to execute goal org.apache.maven.plugins:maven-invoker-plugin:3.6.0:run (integration-tests) on project quarkus-integration-test-container-image-invoker: 1 build failed. See console output above for details.

---

⚙️ Maven Tests - JDK 11 Windows #

📦 integration-tests/maven

✖ io.quarkus.maven.it.JarRunnerIT.testPlatformPropertiesOverridenInApplicationProperties line 135 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.maven.it.JarRunnerIT that uses io.quarkus.maven.it.verifier.MavenProcessInvocationResult was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

✖ io.quarkus.maven.it.UberJarQuarkusIntegrationTestIT.testUberJar line 13 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.maven.it.QuarkusITBase that uses io.quarkus.maven.it.verifier.MavenProcessInvocationResult was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

✖ io.quarkus.maven.it.JarRunnerIT.testPlatformPropertiesOverridenInApplicationProperties line 135 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.maven.it.JarRunnerIT that uses io.quarkus.maven.it.verifier.MavenProcessInvocationResult was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

✖ io.quarkus.maven.it.UberJarQuarkusIntegrationTestIT.testUberJar line 13 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.maven.it.QuarkusITBase that uses io.quarkus.maven.it.verifier.MavenProcessInvocationResult was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

[zakkak]

CI failures are not related