GH-252: Fix NPE in the KinesisMessageDrivenChannelAdapter.

Fixes: https://github.com/spring-projects/spring-integration-aws/issues/252

* Adapt to Java `23`
* Upgrade to Gradle `8.12.1`
* Include `org.mockito` & `net.bytebuddy` dependencies explicitly since they are overridden
by transitive dependencies to not compatible versions with Java `23`
* Add `-parameters` compiler option to include method param names into bytecode
for better discovery by reflection

build.gradle

@@ -26,7 +26,6 @@ repositories {
 }
 
 ext {
-	assertjVersion = '3.26.3'
 	awaitilityVersion = '4.2.2'
 	awsSdkVersion = '2.20.162'
 	jacksonVersion = '2.15.4'
@@ -126,10 +125,11 @@ dependencies {
 
 	optionalApi "jakarta.servlet:jakarta.servlet-api:$servletApiVersion"
 
-	testImplementation('org.springframework.integration:spring-integration-test') {
-		exclude group: 'junit'
-	}
-	testImplementation "org.assertj:assertj-core:$assertjVersion"
+	testImplementation 'org.mockito:mockito-core:5.15.2'
+	testImplementation 'net.bytebuddy:byte-buddy:1.15.11'
+	testImplementation 'net.bytebuddy:byte-buddy-agent:1.15.11'
+
+	testImplementation 'org.springframework.integration:spring-integration-test'
 	testImplementation("org.awaitility:awaitility:$awaitilityVersion") {
 		exclude group: 'org.hamcrest'
 	}
@@ -172,7 +172,7 @@ javadoc {
 
 // enable all compiler warnings; individual projects may customize further
 ext.xLintArg = '-Xlint:all,-options'
-[compileJava, compileTestJava]*.options*.compilerArgs = [xLintArg]
+[compileJava, compileTestJava]*.options*.compilerArgs = [xLintArg, '-parameters']
 
 test {
 	maxHeapSize = '1024m'
@@ -186,7 +186,6 @@ check.dependsOn javadoc
 task updateCopyrights {
 	onlyIf { !isCI }
 	inputs.files(modifiedFiles)
-	outputs.dir('build/classes')
 
 	doLast {
 		def now = Calendar.instance.get(Calendar.YEAR) as String

gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=1541fa36599e12857140465f3c91a97409b4512501c26f9631fb113e392c5bd1
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.1-bin.zip
+distributionSha256Sum=8d97a97984f6cbd2b85fe4c60a743440a347544bf18818048e611f5288d46c94
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -86,8 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
-' "$PWD" ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum

src/main/java/org/springframework/integration/aws/inbound/S3InboundFileSynchronizer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 the original author or authors.
+ * Copyright 2016-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,6 +53,7 @@ public class S3InboundFileSynchronizer extends AbstractInboundFileSynchronizer<S
 	 * {@link Session} instances.
 	 * @param sessionFactory The session factory.
 	 */
+	@SuppressWarnings("this-escape")
 	public S3InboundFileSynchronizer(SessionFactory<S3Object> sessionFactory) {
 		super(sessionFactory);
 		doSetRemoteDirectoryExpression(new LiteralExpression(null));

src/main/java/org/springframework/integration/aws/inbound/S3StreamingMessageSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 the original author or authors.
+ * Copyright 2016-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,7 @@ public class S3StreamingMessageSource extends AbstractRemoteFileStreamingMessage
 		super(template, null);
 	}
 
+	@SuppressWarnings("this-escape")
 	public S3StreamingMessageSource(RemoteFileTemplate<S3Object> template, Comparator<S3Object> comparator) {
 		super(template, comparator);
 		doSetFilter(new S3PersistentAcceptOnceFileListFilter(new SimpleMetadataStore(), "s3StreamingMessageSource"));

src/main/java/org/springframework/integration/aws/inbound/kinesis/KinesisMessageDrivenChannelAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2024 the original author or authors.
+ * Copyright 2017-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1150,7 +1150,7 @@ public class KinesisMessageDrivenChannelAdapter extends MessageProducerSupport
 			};
 		}
 
-		private void rewindIteratorOnError(Exception ex, GetRecordsResponse result) {
+		private void rewindIteratorOnError(Exception ex, @Nullable GetRecordsResponse result) {
 			String lastCheckpoint = this.checkpointer.getLastCheckpointValue();
 			String highestSequence = this.checkpointer.getHighestSequence();
 
@@ -1159,7 +1159,7 @@ public class KinesisMessageDrivenChannelAdapter extends MessageProducerSupport
 				logger.info(ex, "getRecords request has thrown exception. " +
 						"No checkpoints - re-request with the current shard iterator.");
 			}
-			else if (highestSequence.equals(lastCheckpoint)) {
+			else if (highestSequence.equals(lastCheckpoint) && result != null) {
 				logger.info(ex, "Record processor has thrown exception. " +
 						"Ignore since the highest sequence in batch was check-pointed.");
 				this.shardIterator = result.nextShardIterator();
@@ -1187,8 +1187,10 @@ public class KinesisMessageDrivenChannelAdapter extends MessageProducerSupport
 			}
 		}
 
-		private boolean reRequestCurrentShardIterator(@Nullable String lastCheckpoint, GetRecordsResponse result) {
-			if (lastCheckpoint == null) {
+		private boolean reRequestCurrentShardIterator(@Nullable String lastCheckpoint,
+				@Nullable GetRecordsResponse result) {
+
+			if (lastCheckpoint == null || result == null) {
 				return true;
 			}
 			List<Record> records = result.records();

src/main/java/org/springframework/integration/aws/support/KplBackpressureException.java

@@ -34,7 +34,7 @@ public class KplBackpressureException extends RuntimeException {
 	@Serial
 	private static final long serialVersionUID = 1L;
 
-	private final UserRecord userRecord;
+	private final transient UserRecord userRecord;
 
 	public KplBackpressureException(String message, UserRecord userRecord) {
 		super(message);