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* GH-3454: From MQTT conversion error - to error ch Fixes https://github.com/spring-projects/spring-integration/issues/3454 The message converter may return null when we try to covert from the MQTT message. The thrown exception may also reset the client connect. * Fix `MqttPahoMessageDrivenChannelAdapter` to catch any conversion errors (including `null` result) and try to send an `ErrorMessage` with that info into the provided `errorChannel`. Otherwise re-throw it as as **Cherry-pick to `5.4.x` & `5.3.x`** * * Apply review language-specific changes
Spring Integration 
Code of Conduct
Please see our Code of conduct.
Reporting Security Vulnerabilities
Please see our Security policy.
Checking out and Building
To check out the project and build from the 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 an available heap and permgen for Gradle:
GRADLE_OPTS='-XX:MaxPermSize=1024m -Xmx1024m'
To build and install jars into your local Maven cache:
./gradlew publishToMavenLocal
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: https://projects.spring.io/spring-integration