Add redis: Boot 4.1 + Spring Data Redis 4.1, the JDK-serialisation default vs Jackson 3 serializers, @RedisHash TTL and keyspace events, @RedisListener, and Redis as the Spring cache

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3

redis/docs/output/07-jackson-untrusted-class.txt

@@ -0,0 +1,16 @@
+# The @class property is input: the allow-list decides what it may name
+
+
+--- A class outside the allow-list ---
+$ redis-cli -p 6390 SET user:evil '{"@class":"com.ankurm.other.Outsider","name":"x"}'
+OK
+jsonTemplate.opsForValue().get("user:evil")
+org.springframework.data.redis.serializer.SerializationException
+  message: Could not read JSON: Could not resolve type id 'com.ankurm.other.Outsider' as a subtype of `com.ankurm.other.Outsider`: Configured `PolymorphicTypeValidator` (of type `tools.jackson.databind.jsontype.BasicPolymorphicTypeValidator`) denied resolution
+
+--- A class inside the allow-list that no longer exists ---
+$ redis-cli -p 6390 SET user:gone '{"@class":"com.ankurm.redis.model.Gone","id":9}'
+OK
+jsonTemplate.opsForValue().get("user:gone")
+org.springframework.data.redis.serializer.SerializationException
+  message: Could not read JSON: Failed to parse type 'com.ankurm.redis.model.Gone' (remaining: ''): Cannot locate class 'com.ankurm.redis.model.Gone', problem: com.ankurm.redis.model.Gone