The standalone Spring Integration for Apache Kafka project has been merged as a spring-integration-kafka module to this project.spring-doc.cn

The KafkaProducerMessageHandler sendTimeoutExpression default has changed.spring-doc.cn

You can now access the Future<?> for underlying send() operations.spring-doc.cn

See Spring for Apache Kafka Support for more information.spring-doc.cn

The Channel Adapters for R2DBC database interaction have been introduced. See R2DBC Support for more information.spring-doc.cn

The Channel Adapters for Redis Stream support have been introduced. See Redis Stream Outbound Channel Adapter for more information.spring-doc.cn

A Renewable lock registry has been introduced to allow renew lease of a distributed lock. See JDBC implementation for more information.spring-doc.cn

ZeroMqChannel, ZeroMqMessageHandler and ZeroMqMessageProducer have been introduced. See ZeroMQ Support for more information.spring-doc.cn

The one-way messaging gateway (the void method return type) now sets a nullChannel explicitly into the replyChannel header to ignore any possible downstream replies. See Setting the Default Reply Channel for more information.spring-doc.cn

Also the gateway method invokers (GatewayProxyFactoryBean.MethodInvocationGateway) are now supplied with the managed bean name as a combination of gateway proxy bean name plus method signature. For example: sampleGateway#echo(String). This effects message history and metrics exposed for the gateway method calls and also give fine-grained logs during start and close of application context.spring-doc.cn

The aggregator (and resequencer) can now expire orphaned groups (groups in a persistent store where no new messages arrive after an application restart). See Aggregator Expiring Groups for more information.spring-doc.cn

The legacy metrics that were replaced by Micrometer meters have been removed.spring-doc.cn

The Thread Barrier has now two separate timeout options: requestTimeout and triggerTimeout.spring-doc.cn

Connection factories now support multiple sending components (TcpSender); they remain limited to one receiving component (TcpListener). This allows, for example, an inbound gateway and outbound channel adapter to share the same factory, supporting both request/reply and arbitrary messaging from the server to the client. Shared factories should not be used with outbound gateways, unless single-use connections or the ThreadAffinityClientConnectionFactory are being used. See Collaborating Channel Adapters and TCP Gateways for more information.spring-doc.cn

The UDP channel adapters can now be configured with a SocketCustomizer which allows the setting of socket properties that are not directly supported by the adapters. See UDP Adapters for more information.spring-doc.cn

The outbound endpoints now have a new mechanism for handling publisher confirms and returns. See Alternative Mechanism for Publisher Confirms and Returns for more information.spring-doc.cn

A new BatchMode.EXTRACT_PAYLOAD_WITH_HEADERS is supported by the AmqpInboundChannelAdapter. See Inbound Channel Adapter for more information.spring-doc.cn

The AbstractMailReceiver can now produce the MimeMessage as-is without eager fetching its content. See Mail-receiving Channel Adapter for more information.spring-doc.cn