d9c6ffee74
JIRA: https://jira.spring.io/browse/INT-4217 Previously, SpEL method calls with required header parameters had the following form: #target.messageAndHeader(message, headers['number'] != null ? headers['number'] : T(org.springframework.util.Assert).isTrue(false, 'required header not available: number')) The SpEL compiler cannot compile this because the else clause of the ternary has no `exitDescriptor` to indicate the type. Change the expression to use a function for required headers. Also use an Elvis operator when possible. Some examples of new expressions: #target.optionalAndRequiredHeader(headers['prop'] ?: null, #requiredHeader(headers, 'num')) #target.optionalAndRequiredDottedHeader(headers['dot1'] != null ? headers['dot1'].foo : null, #requiredHeader(headers, 'dot2').baz In the second case, we can't use an Elvis because we're accessing a `foo` property of the header. __cherry-pick to 4.3.x__ - make `ParametersWrapper` `static` - minor conflicts in imports - remove the perf test * Polishing: remove redundant annotation args for their default values usage * Revert `java.util.Optional` import in favor of literal for Java < 8 * Make `AnnotatedTestService` as `public` to get compilable SpELs * Remove performance test from the `MethodInvokingMessageProcessorTests`
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