Add awaitility module: testing async @Async/@Scheduled/@KafkaListener code without Thread.sleep
Covers replacing Thread.sleep with await() across a void @Async method, an @EmbeddedKafka-backed @KafkaListener, and an already-running @Scheduled job; verifies Awaitility 4.3.0's real defaults (10s timeout, 100ms poll interval) and its default-uncaught-exception-handler swap directly against the jar; and documents a real pom.xml trap where Boot 4.1.1 split Kafka's autoconfiguration (spring-boot-kafka) out of spring-kafka itself, which silently leaves @KafkaListener beans with no running container.
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Claude
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[INFO] Running com.ankurm.awaitility.KafkaListenerAwaitTest
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[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 8.012 s -- in com.ankurm.awaitility.KafkaListenerAwaitTest
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[INFO] Running com.ankurm.awaitility.ScheduledJobAwaitTest
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[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.841 s -- in com.ankurm.awaitility.ScheduledJobAwaitTest
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[INFO] Running com.ankurm.awaitility.UncaughtExceptionHandlerSwapTest
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[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.115 s -- in com.ankurm.awaitility.UncaughtExceptionHandlerSwapTest
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[INFO] Running com.ankurm.awaitility.AwaitAsyncConfirmationTest
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[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.654 s -- in com.ankurm.awaitility.AwaitAsyncConfirmationTest
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[INFO] Running com.ankurm.awaitility.IgnoreExceptionsTest
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[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.636 s -- in com.ankurm.awaitility.IgnoreExceptionsTest
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[INFO] Running com.ankurm.awaitility.DefaultTimingTest
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[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 10.70 s -- in com.ankurm.awaitility.DefaultTimingTest
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[INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0
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[INFO] BUILD SUCCESS
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== Thread.sleep(100) against a confirmation that actually takes 220ms (real failure, test since removed) ==
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$ mvn -B -Dtest=SleepGuessesWrongTest test
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[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 3.568 s <<< FAILURE! -- in com.ankurm.awaitility.SleepGuessesWrongTest
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com.ankurm.awaitility.SleepGuessesWrongTest.confirmationArrivesWithin100ms -- Time elapsed: 1.084 s <<< FAILURE!
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java.lang.AssertionError:
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Expecting actual not to be null
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at com.ankurm.awaitility.SleepGuessesWrongTest.confirmationArrivesWithin100ms(SleepGuessesWrongTest.java:27)
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== await().untilAsserted() against a 220ms-delayed void @Async method ==
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mailbox.confirmationFor("ORD-CAPTURE") immediately before sendConfirmation(): null
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await().atMost(2s).untilAsserted(...) returned after approximately: 307ms
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mailbox.confirmationFor("ORD-CAPTURE") once await() returns: order ORD-CAPTURE confirmed
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== await().until(() -> false) with no atMost(...) override ==
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elapsed before ConditionTimeoutException: 10057ms (expected: ~10,000ms)
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== await().atMost(550ms).until(...) with no pollInterval(...) override ==
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poll timestamps (ms since start): [107, 207, 308, 409, 509]
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gaps between consecutive polls (ms): [100, 101, 101, 100]
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average gap: 100.5ms (expected: ~100ms)
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== await() for an @KafkaListener to consume a record a KafkaTemplate just sent, against an @EmbeddedKafka broker ==
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listener.received() immediately after send() returned: (not checked -- that is the point)
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listener.received() once await() returned: [order-77-created]
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approximate elapsed time: 378ms
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== await() for 3 more @Scheduled(fixedRate = 150) executions, regardless of how long the job had already been running ==
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runCount() when the test started: 1
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target (baseline + 3): 4
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runCount() once await() returned: 4
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approximate elapsed time: 510ms
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== Thread.getDefaultUncaughtExceptionHandler() before, during and after one await() call ==
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handler during await() is the one this test installed: false (expected: false)
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handler during await() is Awaitility's own (class org.awaitility.core.CallableCondition$1)
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handler after await() is the one this test installed: true (expected: true)
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== await().untilAsserted(...) with no ignoreExceptionsInstanceOf(...), against a resource that throws for its first 300ms (real failure, test since removed) ==
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$ mvn -B -Dtest=ExceptionPropagatesImmediatelyTest test
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[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.940 s <<< FAILURE! -- in com.ankurm.awaitility.ExceptionPropagatesImmediatelyTest
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com.ankurm.awaitility.ExceptionPropagatesImmediatelyTest.failsOnTheFirstPollInsteadOfWaiting -- Time elapsed: 0.946 s <<< ERROR!
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java.lang.IllegalStateException: resource is still warming up
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at com.ankurm.awaitility.FlakyStartupResource.value(FlakyStartupResource.java:26)
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at com.ankurm.awaitility.ExceptionPropagatesImmediatelyTest.lambda$failsOnTheFirstPollInsteadOfWaiting$0(ExceptionPropagatesImmediatelyTest.java:28)
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Note "Errors: 1", not a ConditionTimeoutException after the full atMost(1s) window: the exception
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from the very first poll propagated straight out instead of being retried.
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== await().ignoreExceptionsInstanceOf(IllegalStateException.class) against a resource that throws for its first 300ms ==
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approximate elapsed time before resource.value() finally returned "ready": 302ms (expected: a little over 300ms)
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== Real failure with org.springframework.kafka:spring-kafka as a direct dependency instead of org.springframework.boot:spring-boot-starter-kafka (pom.xml since fixed) ==
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$ mvn -B test
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[ERROR] Errors:
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[ERROR] KafkaListenerAwaitTest.messageSentIsEventuallyConsumed:49 ? ConditionTimeout Assertion condition defined as a Lambda expression in com.ankurm.awaitility.KafkaListenerAwaitTest
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Expecting ConcurrentLinkedQueue:
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[]
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to contain:
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["order-42-created"]
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but could not find the following element(s):
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["order-42-created"]
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within 5 seconds.
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[INFO]
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[ERROR] Tests run: 11, Failures: 0, Errors: 2, Skipped: 0
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No exception at context startup, and the application context came up without a single warning.
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Autowiring KafkaListenerEndpointRegistry directly in a scratch test and calling
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getListenerContainers() on it confirmed the real cause: the bean did not exist. Neither did
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KafkaTemplate, ConsumerFactory, or kafkaListenerContainerFactory. Grepping the full log for the
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Spring Kafka logger prefix also confirmed it:
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$ grep -c "o\.s\.k\." full-test-run.log
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0
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== Confirming the Boot 4.1 Kafka module split directly against Maven Central's real POMs ==
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$ curl -sS https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-dependencies/4.1.1/spring-boot-dependencies-4.1.1.pom -o spring-boot-dependencies-4.1.1.pom
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$ grep -B3 '<artifactId>spring-boot-kafka</artifactId>' spring-boot-dependencies-4.1.1.pom
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-kafka</artifactId>
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$ curl -sS https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-starter-kafka/4.1.1/spring-boot-starter-kafka-4.1.1.pom | grep -A2 '<artifactId>'
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<artifactId>spring-boot-starter-kafka</artifactId>
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<version>4.1.1</version>
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<name>spring-boot-starter-kafka</name>
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--
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<artifactId>spring-boot-starter</artifactId>
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<version>4.1.1</version>
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<scope>compile</scope>
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--
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<artifactId>spring-boot-kafka</artifactId>
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<version>4.1.1</version>
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<scope>compile</scope>
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$ curl -sS https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-kafka/4.1.1/spring-boot-kafka-4.1.1.pom | grep -A2 '<artifactId>'
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<artifactId>spring-boot-kafka</artifactId>
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<version>4.1.1</version>
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<name>spring-boot-kafka</name>
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--
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<artifactId>spring-boot</artifactId>
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<version>4.1.1</version>
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<scope>compile</scope>
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--
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<artifactId>spring-boot-transaction</artifactId>
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<version>4.1.1</version>
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<scope>compile</scope>
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--
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<artifactId>spring-kafka</artifactId>
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<version>4.1.1</version>
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<scope>compile</scope>
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