bce851576e
JIRA: https://jira.spring.io/browse/INT-4075 Fixes GH-1854 (https://github.com/spring-projects/spring-integration/issues/1854) The `catch` block just swallows an Exception with the logger and leaves `stompSessionListenableFuture` as `null`. The next `stompSessionListenableFuture` usage over two code lines bellow ends up with `NPE`. * Add reconnect logic into that `catch` block and just return from there, since we don't have anything to go ahead. * Add `if (e != null) {` around `log.error` in the `scheduleReconnect` * Add `if...else` around `this.stompClient.getTaskScheduler()` and `log.info()` to notify end-user that there won't be reconnection if there is no `taskScheduler` * Add `StompSessionManagerTests` mock tests to verify solution **Cherry-pick to 4.2.x**
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
NOTE: While Spring Integration runs with Java SE 6 or higher, a Java 8 compiler is required to build the project.
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