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Before the fix, these methods would throw a NPE in case when the filter class passed as the second parameter, is not registered yet. In particular, this exception can occur when mixing standard and custom DSL to register filters. The fix doesn't change the situation that standard DSL for registration of filters cannot refer to filters that are registered via custom DSL even though those calls were done earlier. It just provides more user-friendly error handling for this and most likely other scenarios of calls of HttpSecurity#addFilterBefore, HttpSecurity#addFilterAfter. The error handling is implemented similarly to HttpSecurity#addFilter. Closes gh-12637
image::https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge] image:https://github.com/spring-projects/spring-security/workflows/CI/badge.svg?branch=main["Build Status", link="https://github.com/spring-projects/spring-security/actions?query=workflow%3ACI"] image:https://img.shields.io/badge/Revved%20up%20by-Gradle%20Enterprise-06A0CE?logo=Gradle&labelColor=02303A["Revved up by Gradle Enterprise", link="https://ge.spring.io/scans?search.rootProjectNames=spring-security"] = 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/services[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].