Avoid NumberFormatException for Java 1.8

[gsmet]

I had to update (with quarkus update) a very old Quarkus project that was having 1.8 as a maven.compiler.target and this led to an error that is less than ideal.

This will make you go a bit further and get a proper message saying Java 1.8 is not supported.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit c41dd13.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

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Flaky tests - Develocity

⚙️ JVM Tests - JDK 21

📦 integration-tests/kotlin

✖ io.quarkus.kotlin.maven.it.KotlinRemoteDevModeIT.testThatTheApplicationIsReloadedOnKotlinChange - History

• org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in io.quarkus.maven.it.RunAndCheckWithAgentMojoTestBase was not fulfilled within 1 minutes. - java.lang.RuntimeException

java.lang.RuntimeException: org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in io.quarkus.maven.it.RunAndCheckWithAgentMojoTestBase was not fulfilled within 1 minutes.
	at io.quarkus.maven.it.RunAndCheckWithAgentMojoTestBase.runAndCheck(RunAndCheckWithAgentMojoTestBase.java:86)
	at io.quarkus.kotlin.maven.it.KotlinRemoteDevModeIT.testThatTheApplicationIsReloadedOnKotlinChange(KotlinRemoteDevModeIT.java:23)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
Caused by: org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in io.quarkus.maven.it.RunAndCheckWithAgentMojoTestBase was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)