fix(java): stop silently disabling every compile task

[stromanni]

ErrorProneOptions exposes enabled, not isEnabled — the latter was the
name under gradle-errorprone-plugin 3.x. Since the type has no isEnabled
member today, Kotlin resolved the assignment against the outer receiver, the
JavaCompile task:

tasks.withType<JavaCompile>().configureEach {
    options.errorprone {
        isEnabled = false   // sets task.enabled = false
    }
}

So every JavaCompile in the module was disabled. compileJava escaped only
because the block below it set isEnabled = true, re-enabling that one task.
Everything else has been silently skipped:

> Task :compileTestJava SKIPPED
Skipping task ':compileTestJava' as task onlyIf 'Task is enabled' is false.

Two consequences, both shipping today:

• The Java test suite has never run. :test reports NO-SOURCE because no
  test classes are produced. Same for :spring:compileTestJava.
• The FFM (Panama) transport has never been compiled or packaged.
  compileJava22Java was disabled too, so the multi-release jar shipped with no
  META-INF/versions/22 overlay and JDK 22+ consumers silently stayed on JNI —
  the opposite of what NativeTransport.create documents.

Error Prone itself was unaffected: compileJava still ran NullAway, because
isEnabled never reached Error Prone in either direction.

Changes

enabled.set(...) in all three build scripts, with a comment naming the trap.

Enabling the tests surfaces one pre-existing failure, fixed in its own commit:
InMemorySettings.reservedPrefixes() never gained middleware:disabled: when
#596 added it to the core list, which is exactly the drift
ReservedSettingPrefixesTest exists to catch.

Verification

./gradlew build          # green, 487 tests, 4 consecutive runs

build/classes/java/java22/…/FfmTransport.class is produced again, and the jar
carries 6 META-INF/versions/22 entries.

Summary by CodeRabbit

• Bug Fixes

  • Updated Java build validation settings for more reliable compilation checks.
  • Ensured disabled middleware settings are correctly recognized and preserved during testing.

• Chores

  • Standardized static analysis configuration across Java modules.
  • Maintained existing null-safety checks and compile-time validation behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 59cd0fb2-9dfe-48e9-b796-77332d596ead

📥 Commits

Reviewing files that changed from the base of the PR and between 90be320 and 32933bb.

📒 Files selected for processing (4)

• sdks/java/build.gradle.kts
• sdks/java/processor/build.gradle.kts
• sdks/java/spring/build.gradle.kts
• sdks/java/src/test/java/org/byteveda/taskito/dashboard/InMemorySettings.java

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• ByteVeda/taskito (manual)

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📝 Walkthrough

Walkthrough

Changes

Error Prone configuration

Layer / File(s)	Summary
Update Error Prone property configuration sdks/java/build.gradle.kts, sdks/java/processor/build.gradle.kts, sdks/java/spring/build.gradle.kts	The build scripts replace isEnabled assignments with enabled.set(...). General compilation disables Error Prone, while configured compileJava tasks enable it. Comments document the property requirement.

Reserved settings prefix

Layer / File(s)	Summary
Reserve middleware disabled prefix sdks/java/src/test/java/org/byteveda/taskito/dashboard/InMemorySettings.java	reservedPrefixes() now includes middleware:disabled:.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: pratyush618

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary Java build fix that stopped compile tasks from being silently disabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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