010ce8b01f
Right now the `JmsMessageDrivenEndpoint` only logs a warn about already provided listener. Turns out this is not enough for end-users and they may miss the warn message in the logs somehow having some problems at runtime trying to determine find out the root of unexpected behavior * Change the warn message to the `Assert.isNull()` to fail fast. Same is done in the `KafkaMessageDrivenChannelAdapter` & `AmqpInboundChannelAdapter`
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 clean test
or
./gradlew clean testAll
The latter runs additional tests (those annotated with @LongRunningIntegrationTest); it is a more thorough test but takes quite a lot longer to run.
The test results are captured in build/reports/tests/test (or .../testAll) under each module (in HTML format).
Add --continue to the command to perform a complete build, even if there are failing tests in some modules; otherwise the build will stop after the current module(s) being built are completed.
NOTE: While Spring Integration runs with Java SE 8 or higher, a Java 11 compiler is required to build the project.
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 the reference documentation (results will be in build/docs/asciidoc and build/docs/asciidocPdf):
./gradlew reference
To build complete distribution including -dist, -docs, and -schema zip files (results will be in build/distributions):
./gradlew dist
Using Eclipse or Spring Tool Suite (with BuildShip Plugin)
If you have the BuildShip plugin installed,
File -> Import -> Gradle -> Existing Gradle Project
Using Eclipse or Spring Tool Suite (when the BuildShip Plugin is not installed)
To generate Eclipse metadata (.classpath and .project files, etc), do the following:
./gradlew eclipse
Once complete, you may then import the projects into Eclipse as usual:
File -> Import -> General -> Existing projects into workspace
Browse to the 'spring-integration' root directory. All projects should import free of errors.
Using IntelliJ IDEA
To import the project into IntelliJ IDEA:
File -> Open... -> and select build.gradle from spring-integration project root directory
Guidelines
See also Contributor Guidelines.
Resources
For more information, please visit the Spring Integration website at: https://spring.io/projects/spring-integration