JIRA: https://jira.spring.io/browse/INT-4238 Revert to using the sync client in the message-driven adapter so we can detect subscription failures (the sync client throws an exception). The only reason to use the async client was to timeout disconnects; this can be achieved with the sync client and `disconnectForcibly`. Also, the subscribe method updates the qos argument with the granted QOS values. Detect and log if any QOS does not match the request. Polishing Polishing - PR Comments Conflicts: spring-integration-mqtt/src/test/java/org/springframework/integration/mqtt/MqttAdapterTests.java * Remove all new tests since Paho lib has class signature check, so we can't mock its classes
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