5e9624f2cf
JIRA: https://jira.spring.io/browse/INT-3724 Add support for `CompletableFuture<?>` return types on gateway methods, if JDK8 is being used. - If the return type is exactly `CompletableFuture` and an async executor is provided, use `CompletableFuture.supplyAsync()` - If there is no return async executor, return types can be `CompletableFuture` or a subclass and the flow can return such a future. - Also fixes a problem for return type `Future<Message<?>>` with no async executor; previously this caused a `ClassCastException` because the gateway returned the message - it assumed such return types would always run on an excutor. We can consider back-porting this last part, but nobody has complained. CompletableFuture Docs Fix typos, polishing for JavaDocs and some code style polishing
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