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JIRA: https://jira.spring.io/browse/INT-3654 Previously, single-use `TcpConnections` self-closed when their use was complete. This is unnatural and caused issues such as INT-3722. Remove the self-closing behavior; connection close is now (properly) the responsibility of the client using the connection: - Client Side: -- `TcpOutboundGateway` after the reply is received -- `TcpSendingMessageHandler` after the send, when there is no collaborating inbound adapter -- `TcpReceivingChannelAdapter` when it is collaborating (after receiving the reply) - Server Side: -- `TcpInboundGateway` after the reply is sent -- `TcpReceivingChannelAdapter` after the receive, when there is no collaborating outbound adapter -- `TcpSendingMessageHandler` when it is colllaborating (after sending the reply) As before, the `CachingClientConnectionFactory` always sets single use on the target factory to force it to create new connections on demand. It is always a single-use factory itself so the clients return the connections to the pool (via `close()`). __Needs a migration guide entry__ INT-3654: Fix Late Listener Registration Timing failures in `TcpOutboundGatewayTests.testFailoverCached()` (null listener). The `FailoverClientConnectionFactory` registers its listener with the actual connections it retrieves from a delegate. When nesting failover and cached connection factories, we need to propagate the `enableManualListenerRegistration` to the delegate factories so the connection will wait for its listener to be registered.
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