Create features/integrations

docs/modules/ROOT/pages/features/integrations/jackson.adoc

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+[[jackson]]
+= Jackson Support
+
+Spring Security provides Jackson support for persisting Spring Security related classes.
+This can improve the performance of serializing Spring Security related classes when working with distributed sessions (i.e. session replication, Spring Session, etc).
+
+To use it, register the `SecurityJackson2Modules.getModules(ClassLoader)` with `ObjectMapper` (https://github.com/FasterXML/jackson-databind[jackson-databind]):
+
+====
+.Java
+[source,java,role="primary"]
+----
+ObjectMapper mapper = new ObjectMapper();
+ClassLoader loader = getClass().getClassLoader();
+List<Module> modules = SecurityJackson2Modules.getModules(loader);
+mapper.registerModules(modules);
+
+// ... use ObjectMapper as normally ...
+SecurityContext context = new SecurityContextImpl();
+// ...
+String json = mapper.writeValueAsString(context);
+----
+
+.Kotlin
+[source,kotlin,role="secondary"]
+----
+val mapper = ObjectMapper()
+val loader = javaClass.classLoader
+val modules: MutableList<Module> = SecurityJackson2Modules.getModules(loader)
+mapper.registerModules(modules)
+
+// ... use ObjectMapper as normally ...
+val context: SecurityContext = SecurityContextImpl()
+// ...
+val json: String = mapper.writeValueAsString(context)
+----
+====
+
+[NOTE]
+====
+The following Spring Security modules provide Jackson support:
+
+- spring-security-core (`CoreJackson2Module`)
+- spring-security-web (`WebJackson2Module`, `WebServletJackson2Module`, `WebServerJackson2Module`)
+- xref:servlet/oauth2/oauth2-client.adoc#oauth2client[ spring-security-oauth2-client] (`OAuth2ClientJackson2Module`)
+- spring-security-cas (`CasJackson2Module`)
+====