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There is really no need for a result handler dedicated to a void return value and it's actually problematic to have it. Each result handler treats void as necessary. For an @ResponseBody method it means an empty body. For view resolution it means no specific value was returned and we should procede with selecting a default view name. Having a dedicated void result handler can interfere with this especially since view resolution needs to be last in order. At the same time there are cases when no result handling is needed and the response is fully handled within the HandlerAdapter. This is the case with WebHandler and the SimpleHandlerAdapter. For that case we simply return mono.then(aVoid -> Mono.empty()) which effectively returns an empty Mono and no result handling follows. The HandlerAdapter already says you can return no values at all if the response is fully handled.
Spring Framework
The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications -- on any kind of deployment platform. A key element of Spring is infrastructural support at the application level: Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments.
The framework also serves as the foundation for Spring Integration, Spring Batch and the rest of the Spring family of projects. Browse the repositories under the Spring organization on GitHub for a full list.
Code of Conduct
This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io.
Downloading Artifacts
See downloading Spring artifacts for Maven repository information. Unable to use Maven or other transitive dependency management tools? See building a distribution with dependencies.
Documentation
See the current Javadoc and reference docs.
Getting Support
Check out the spring tags on Stack Overflow. Commercial support is available too.
Issue Tracking
Report issues via the Spring Framework JIRA. Understand our issue management process by reading about the lifecycle of an issue. Think you've found a bug? Please consider submitting a reproduction project via the spring-framework-issues GitHub repository. The readme there provides simple step-by-step instructions.
Building from Source
The Spring Framework uses a Gradle-based build system. In the instructions
below, ./gradlew is invoked from the root of the source tree and serves as
a cross-platform, self-contained bootstrap mechanism for the build.
Prerequisites
Git and JDK 8 update 20 or later
Be sure that your JAVA_HOME environment variable points to the jdk1.8.0 folder
extracted from the JDK download.
Check out sources
git clone git@github.com:spring-projects/spring-framework.git
Import sources into your IDE
Run ./import-into-eclipse.sh or read import-into-idea.md as appropriate.
Note: Per the prerequisites above, ensure that you have JDK 8 configured properly in your IDE.
Install all spring-* jars into your local Maven cache
./gradlew install
Compile and test; build all jars, distribution zips, and docs
./gradlew build
... and discover more commands with ./gradlew tasks. See also the Gradle
build and release FAQ.
Contributing
Pull requests are welcome; see the contributor guidelines for details.
Staying in Touch
Follow @SpringCentral as well as @SpringFramework and its team members on Twitter. In-depth articles can be found at The Spring Blog, and releases are announced via our news feed.
License
The Spring Framework is released under version 2.0 of the Apache License.