Josh Cummings cdd626644e Use Request-Level Servlet Context
Spring Security cannot use the ServletContext attached
to the ApplicationContext since there may be child
ApplicationContext's with their own ServletContext.

Because of that, it is necessary to always use the
ServletContext attached to the request.

Closes gh-14418
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= Spring Security

Spring Security provides security services for the https://docs.spring.io[Spring IO Platform]. Spring Security 5.0 requires Spring 5.0 as
a minimum and also requires Java 8.

For a detailed list of features and access to the latest release, please visit https://spring.io/projects[Spring projects].

== Code of Conduct
Please see our https://github.com/spring-projects/.github/blob/main/CODE_OF_CONDUCT.md[code of conduct]

== Downloading Artifacts
See https://docs.spring.io/spring-security/site/docs/current/reference/html5/#getting[Getting Spring Security] for how to obtain Spring Security.

== Documentation
Be sure to read the https://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/[Spring Security Reference].
Extensive JavaDoc for the Spring Security code is also available in the https://docs.spring.io/spring-security/site/docs/current/api/[Spring Security API Documentation].

== Quick Start
See https://docs.spring.io/spring-security/site/docs/current/reference/html5/#servlet-hello[Hello Spring Security] to get started with a "Hello, World" application.

== Building from Source
Spring Security uses a https://gradle.org[Gradle]-based build system.
In the instructions below, https://vimeo.com/34436402[`./gradlew`] is invoked from the root of the source tree and serves as
a cross-platform, self-contained bootstrap mechanism for the build.

=== Prerequisites
https://help.github.com/set-up-git-redirect[Git] and the https://www.oracle.com/technetwork/java/javase/downloads[JDK11 build].

Be sure that your `JAVA_HOME` environment variable points to the `jdk-11` folder extracted from the JDK download.

=== Check out sources
[indent=0]
----
git clone git@github.com:spring-projects/spring-security.git
----

=== Install all spring-\* jars into your local Maven cache
[indent=0]
----
./gradlew publishToMavenLocal
----

=== Compile and test; build all jars, distribution zips, and docs
[indent=0]
----
./gradlew build
----

Discover more commands with `./gradlew tasks`.
See also the https://github.com/spring-projects/spring-framework/wiki/Gradle-build-and-release-FAQ[Gradle build and release FAQ].

== Getting Support
Check out the https://stackoverflow.com/questions/tagged/spring-security[Spring Security tags on Stack Overflow].
https://spring.io/support[Commercial support] is available too.

== Contributing
https://help.github.com/articles/creating-a-pull-request[Pull requests] are welcome; see the https://github.com/spring-projects/spring-security/blob/main/CONTRIBUTING.adoc[contributor guidelines] for details.

== License
Spring Security is Open Source software released under the
https://www.apache.org/licenses/LICENSE-2.0.html[Apache 2.0 license].
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