4. What’s New in Spring Integration 5.1?

This chapter provides an overview of the new features and improvements that have been introduced with Spring Integration 5.1. If you are interested in more details, see the Issue Tracker tickets that were resolved as part of the 5.1 development process.

4.1 New Components

The following components are new in 5.1:

4.1.1 AmqpDedicatedChannelAdvice

See Section 14.13, “Strict Message Ordering”.

4.1.2 Improved Function Support

The java.util.function interfaces now have improved integration support in the Framework components. Also Kotlin lambdas now can be used for handler and source methods.

See Section 10.11, “java.util.function Interfaces Support”.

4.1.3 @LongRunningTest

A JUnit 5 @LongRunningTest conditional annotation is provided to check the environment or system properties for the RUN_LONG_INTEGRATION_TESTS entry with the value of true to determine if test should be run or skipped.

See Section F.1.5, “JUnit Rules and Conditions”.

4.2 General Changes

The following changes have been made in version 5.1:

4.2.1 Java DSL

The IntegrationFlowContext is now an interface and IntegrationFlowRegistration is an inner interface of IntegrationFlowContext.

A new logAndReply() operator has been introduced for convenience when you wish to log at the end of a flow for request-reply configurations. This avoid confusion with log() which is treated as a one-way end flow component.

A generated bean name for any NamedComponent within an integration flow is now based on the component type for better readability from visual tools, logs analyzers and metrics collectors.

The GenericHandler.handle() now excepts a MessageHeaders type for the second argument.

4.2.2 Dispatcher Exceptions

Exceptions caught and re-thrown by AbstractDispatcher are now more consistent:

  • A MessagingException of any kind that has a failedMessage property is re-thrown unchanged.
  • All other exceptions are wrapped in a MessageDeliveryException with the failedMessage property set.

Previously:

  • A MessagingException of any kind that has a failedMessage property was re-thrown unchanged
  • A MessagingException that had no failedMessage property was wrapped in a MessagingException with the failedMessage property set.
  • Other RuntimeException instances were re-thrown unchanged.
  • Checked exceptions were wrapped in a MessageDeliveryException with the failedMessage property set.

4.2.3 Global Channel Interceptors

Global channel interceptors now apply to dynamically registered channels, such as through the IntegrationFlowContext when using the Java DSL or beans that are initialized using beanFactory.initializeBean(). Previously, when beans were created after the application context was refreshed, interceptors were not applied.

4.2.4 Channel Interceptors

ChannelInterceptor.postReceive() is no longer called when no message is received; it is no longer necessary to check for a null Message<?>. Previously, the method was called. If you have an interceptor that relies on the previous behavior, implement afterReceiveCompleted() instead, since that method is invoked, regardless of whether a message is received or not. Furthermore, the PolledAmqpChannel and PolledJmsChannel previously did not invoke afterReceiveCompleted() with null; they now do.

4.2.5 ObjectToJsonTransformer

A new ResultType.BYTES mode is introduced for the ObjectToJsonTransformer.

See the section called “JSON Transformers” for more information.

4.2.6 Integration Flows: Generated Bean Names

Starting with version 5.0.5, generated bean names for the components in an IntegrationFlow include the flow bean name, followed by a dot, as a prefix. For example, if a flow bean were named flowBean, a generated bean might be named flowBean.generatedBean.

See Section 11.13, “Working With Message Flows” for more information.

4.2.7 Aggregator Changes

If the groupTimeout is evaluated to a negative value, an aggregator now expires the group immediately. Only null is considered as a signal to do nothing for the current message.

A new popSequence property has been introduced to allow (by default) to call a MessageBuilder.popSequenceDetails() for the output message. Also an AbstractAggregatingMessageGroupProcessor returns now an AbstractIntegrationMessageBuilder instead of the whole Message for optimization.

See Section 8.4, “Aggregator” for more information.

4.2.8 @Publisher annotation changes

Starting with version 5.1, you must explicitly turn on the @Publisher AOP functionality by using @EnablePublisher or by using the <int:enable-publisher> child element on <int:annotation-config>. Also the proxy-target-class and order attributes have been added for tuning the ProxyFactory configuration.

See Section B.1.1, “Annotation-driven Configuration with the @Publisher Annotation” for more information.

4.3 Files Changes

If you are using FileExistsMode.APPEND or FileExistsMode.APPEND_NO_FLUSH you can provide a newFileCallback that will be called when creating a new file. This callback receives the newly created file and the message that triggered the callback. This could be used to write a CSV header, for an example.

The FileReadingMessageSource now doesn’t check and create a directory until its start() is called. So, if an Inbound Channel Adapter for the FileReadingMessageSource has autoStartup = false, there are no failures against the file system during application start up.

See Chapter 17, File Support for more information.

4.4 AMQP Changes

We have made ID and Timestamp header mapping changes in the DefaultAmqpHeaderMapper. See the note near the bottom of Section 14.12, “AMQP Message Headers” for more information.

The contentType header is now correctly mapped as an entry in the general headers map. See Section 14.12.2, “contentType Header” for more information.

4.5 JDBC Changes

A confusing max-rows-per-poll property on the JDBC Inbound Channel Adapter and JDBC Outbound Gateway has been deprecated in favor of the newly introduced max-rows property.

The JdbcMessageHandler supports now a batchUpdate functionality when the payload of the request message is an instance of an Iterable type.

The indexes for the INT_CHANNEL_MESSAGE table (for the JdbcChannelMessageStore) have been optimized. If you have large message groups in such a store, you may wish to alter the indexes.

See Chapter 21, JDBC Support for more information.

4.6 FTP and SFTP Changes

A RotatingServerAdvice is now available to poll multiple servers and directories with the inbound channel adapters. See Section 18.6, “Inbound Channel Adapters: Polling Multiple Servers and Directories” and Section 30.8, “Inbound Channel Adapters: Polling Multiple Servers and Directories” for more information.

Also, inbound adapter localFilenameExpression instances can contain the #remoteDirectory variable, which contains the remote directory being polled. The generic type of the comparators (used to sort the fetched file list for the streaming adapters) has changed from Comparator<AbstractFileInfo<F>> to Comparator<F>. See Section 18.5, “FTP Streaming Inbound Channel Adapter” and Section 30.7, “SFTP Streaming Inbound Channel Adapter” for more information.

In addition, the synchronizers for inbound channel adapters can now be provided with a Comparator. This is useful when using maxFetchSize to limit the files retrieved.

The CachingSessionFactory has a new property testSession which, when true, causes the factory to perform a test() operation on the Session when checking out an existing session from the cache.

See Section 30.4, “SFTP Session Caching” and Section 18.10, “FTP Session Caching” for more information.

The outbound gateway MPUT command now supports a message payload with a collection of files or strings. See Section 30.11, “SFTP Outbound Gateway” and Section 18.9, “FTP Outbound Gateway” for more information.

4.7 TCP Support

When using SSL, host verification is now enabled, by default, to prevent man-in-the-middle attacks with a trusted certificate. See Section 34.10.2, “Host Verification” for more information.

In addition the key and trust store types can now be configured on the DefaultTcpSSLContextSupport.

4.8 Twitter Support

Since the Spring Social project has moved to end of life status, Twitter support in Spring Integration has been moved to the Extensions project. See Spring Integration Social Twitter for more information.

4.9 JMS Support

The JmsSendingMessageHandler now provides deliveryModeExpression and timeToLiveExpression options to determine respective QoS options for JMS message to send at runtime. The DefaultJmsHeaderMapper now allows to map inbound JMSDeliveryMode and JMSExpiration properties via setting to true respective setMapInboundDeliveryMode() and setMapInboundExpiration() options. When a JmsMessageDrivenEndpoint or JmsInboundGateway is stopped, the associated listener container is now shut down; this closes its shared connection and any consumers. You can configure the endpoints to revert to the previous behavior.

See Chapter 23, JMS Support for more information.

4.10 HTTP/WebFlux Support

The statusCodeExpression (and Function) is now supplied with the RequestEntity<?> as a root object for evaluation context, so request headers, method, URI and body are available for target status code calculation.

See Chapter 20, HTTP Support and Chapter 35, WebFlux Support for more information.

4.11 JMX Changes

Object name key values are now quoted if they contain any characters other than those allowed in a Java identifier (or period .). e.g. org.springframework.integration:type=MessageChannel, name="input:foo.myGroup.errors". This has the side effect that previously "allowed" names, with such characters, will now be quoted. e.g. org.springframework.integration:type=MessageChannel, name="input#foo.myGroup.errors".

4.12 Micrometer Support Changes

It is now simpler to customize the standard Micrometer meters created by the framework. See Section 12.1.2, “Micrometer Integration” for more information.

4.13 Integration Graph Customization

It is now possible to add additional properties to the IntegrationNode s via Function<NamedComponent, Map<String, Object>> additionalPropertiesCallback on the IntegrationGraphServer. See Section 12.8, “Integration Graph” for more information.

4.14 Integration Global Properties

The Integration global properties (including defaults) can now be printed in the logs, when a DEBUG logic level is turned on for the org.springframework.integration category. See Section E.4, “Global Properties” for more information.

4.15 The receiveTimeout for @Poller

The @Poller annotation now provides a receiveTimeout option for convenience. See Section E.5.1, “Using the @Poller Annotation” for more information.