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JIRA: https://jira.spring.io/browse/INT-3506 JIRA: https://jira.spring.io/browse/INT-3428 Support flows downstream of the gateway that support returning a `Future<?>` payload. Currently, any method that returns a type that is assignable to `Future<?>` runs async and returns a `FutureTask<?>`. This prevents a service-interface method that returns a custom `Future<?>` object from being invoked without wrapping that `Future<?>` in a `FutureTask<?>`. Allow the async-executor to be set to `null` causing any method returning `Future<?>` to run on the calling thread. Add support for `ListenableFuture<?>`. If the return type is a `RunnableFuture`, `ListenableFuture` or `Future`, or exactly a `FutureTask` or `ListenableFutureTask`, run the flow on the executor (if present); otherwise run on the calling thread. INT-3506 Fix Object returnType INT-3506 Polishing - PR Comments Perform dummy invocations of `submit` and `submitListenable` to determine the actual return types so that we can determine at runtime whether the executor will return a type that is compatible with the method return type. If not, run on the caller's thread. Add DEBUG Log If Incompatible Future<?> INT-3506 Add Support for MessagingGateway Add a constant to indicate no executor. Add tests. INT-3506 Polishing and Docs - Docbook - XSD - Change test to send calling thread in payload so we can determine whether we need to return a Future or not; previously relied on the thread name which was brittle. Polishing JavaDocs. Change `amqp.xml` to use `org.springframework.amqp.support.AmqpHeaders` instead of an old one.
Spring Integration 
Checking out and Building
To check out the project and build from source, do the following:
git clone git://github.com/spring-projects/spring-integration.git
cd spring-integration
./gradlew build
If you encounter out of memory errors during the build, increase available heap and permgen for Gradle:
GRADLE_OPTS='-XX:MaxPermSize=1024m -Xmx1024m'
To build and install jars into your local Maven cache:
./gradlew install
To build api Javadoc (results will be in build/api):
./gradlew api
To build reference documentation (results will be in build/reference):
./gradlew reference
To build complete distribution including -dist, -docs, and -schema zip files (results will be in build/distributions)
./gradlew dist
Using Eclipse
To generate Eclipse metadata (.classpath and .project files), do the following:
./gradlew eclipse
Once complete, you may then import the projects into Eclipse as usual:
File -> Import -> Existing projects into workspace
Browse to the 'spring-integration' root directory. All projects should import free of errors.
Using IntelliJ IDEA
To generate IDEA metadata (.iml and .ipr files), do the following:
./gradlew idea
Resources
For more information, please visit the Spring Integration website at: http://projects.spring.io/spring-integration