Upgrade to Spring Framework 6.0

Closes gh-1950

Author: eleftherias

gradle/dependency-management.gradle

@@ -3,9 +3,9 @@ dependencyManagement {
 		mavenBom 'io.projectreactor:reactor-bom:2020.0.12'
 		mavenBom 'com.fasterxml.jackson:jackson-bom:2.11.2'
 		mavenBom 'org.junit:junit-bom:5.8.1'
-		mavenBom 'org.springframework:spring-framework-bom:5.3.11'
 		mavenBom 'org.springframework.data:spring-data-bom:2021.1.0-RC1'
 		mavenBom 'org.springframework.security:spring-security-bom:5.6.0-RC1'
+		mavenBom 'org.springframework:spring-framework-bom:6.0.0-SNAPSHOT'
 		mavenBom 'org.testcontainers:testcontainers-bom:1.16.0'
 	}
 

spring-session-docs/modules/ROOT/pages/index.adoc

@@ -64,9 +64,9 @@ Spring Session is Open Source software released under the https://www.apache.org
 
 The minimum requirements for Spring Session are:
 
-* Java 8+.
+* Java 17+.
 * If you run in a Servlet Container (not required), Servlet 3.1+.
-* If you use other Spring libraries (not required), the minimum required version is Spring 5.0.x.
+* If you use other Spring libraries (not required), the minimum required version is Spring 6.0.x.
 * `@EnableRedisHttpSession` requires Redis 2.8+. This is necessary to support xref:api.adoc#api-redisindexedsessionrepository-expiration[Session Expiration]
 * `@EnableHazelcastHttpSession` requires Hazelcast 3.6+. This is necessary to support xref:api.adoc#api-enablehazelcasthttpsession-storage[`FindByIndexNameSessionRepository`]
 

spring-session-docs/modules/ROOT/pages/upgrading.adoc

@@ -1,46 +1,20 @@
-[[upgrading-2.0]]
-= Upgrading to 2.x
+[[upgrading-3.0]]
+= Upgrading to 3.x
 
 With the new major release version, the Spring Session team took the opportunity to make some non-passive changes.
 The focus of these changes is to improve and harmonize Spring Session's APIs as well as remove the deprecated components.
 
 == Baseline Update
 
-Spring Session 2.0 requires Java 8 and Spring Framework 5.0 as a baseline, since its entire codebase is now based on Java 8 source code.
+Spring Session 3.0 requires Java 17 and Spring Framework 6.0 as a baseline, since its entire codebase is now based on Java 17 source code.
 See https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x[Upgrading to Spring Framework 5.x] for more on upgrading Spring Framework.
 
-== Replaced and Removed Modules
-
-As a part of the project's splitting of the modules, the existing `spring-session` has been replaced with the `spring-session-core` module.
-The `spring-session-core` module holds only the common set of APIs and components, while other modules contain the implementation of the appropriate `SessionRepository` and functionality related to that data store.
-This applies to several existing modules that were previously a simple dependency aggregator helper module.
-With new module arrangement, the following modules actually carry the implementation:
-
-* Spring Session for MongoDB
-* Spring Session for Redis
-* Spring Session JDBC
-* Spring Session Hazelcast
-
-Also, the following were removed from the main project repository:
-
-* Spring Session Data GemFire
-** https://github.com/spring-projects/spring-session-data-geode[`spring-session-data-geode`]
-
 == Replaced and Removed Packages, Classes, and Methods
 
 The following changes were made to packages, classes, and methods:
 
-* `ExpiringSession` API has been merged into the `Session` API.
-* The `Session` API has been enhanced to make full use of Java 8.
-* The `Session` API has been extended with `changeSessionId` support.
-* The `SessionRepository` API has been updated to better align with Spring Data method naming conventions.
-* `AbstractSessionEvent` and its subclasses are no longer constructable without an underlying `Session` object.
-* The Redis namespace used by `RedisOperationsSessionRepository` is now fully configurable, instead of being partially configurable.
-* Redis configuration support has been updated to avoid registering a Spring Session-specific `RedisTemplate` bean.
-* JDBC configuration support has been updated to avoid registering a Spring Session-specific `JdbcTemplate` bean.
-* Previously deprecated classes and methods have been removed across the codebase
+
 
 == Dropped Support
 
-As a part of the changes to `HttpSessionStrategy` and its alignment to the counterpart from the reactive world, the support for managing multiple users' sessions in a single browser instance has been removed.
-The introduction of a new API to replace this functionality is under consideration for future releases.
+