Getting issues while using Redisson Tomcat session manager to share one redis instance among multiple tomcats

Hi,

I am trying to use one redis instance for multiple tomcats to make session storage centralized for my application. But i am getting below error.

org.redisson.client.RedisTimeoutException: Redis server response timeout (3000 ms) occured for command: (HGET) with params: [redisson:tomcat_session:793608B88C44BAB4E33D83A057A2BD09, PooledUnsafeDirectByteBuf(ridx: 0, widx: 9, cap: 256)] channel: [id: 0x9d152a45, L:/127.0.0.1:60560 - R:127.0.0.1/127.0.0.1:6379]

As far as i understood redisson is not able to get the session created previously and then it goes on to create a new one. Because of this every time i use application on one tomcat to login it creates new session and when i come to other tomcat to use the same application its not able to find the created session and goes on to create a new one.

But i do see all the sessions created in redis and being stored properly. Its just that redisson is not able to read the session.

Below are my config:

redisson.yml

singleServerConfig:
  idleConnectionTimeout: 10000
  pingTimeout: 1000
  connectTimeout: 10000
  timeout: 3000
  retryAttempts: 3
  retryInterval: 1500
  password: null
  subscriptionsPerConnection: 5
  clientName: null
  address: "redis://127.0.0.1:6379"
  subscriptionConnectionMinimumIdleSize: 1
  subscriptionConnectionPoolSize: 50
  connectionMinimumIdleSize: 32
  connectionPoolSize: 64
  database: 0
  dnsMonitoringInterval: 5000
threads: 0
nettyThreads: 0
codec: !<org.redisson.codec.JsonJacksonCodec> {}
transportMode: "NIO"

Context.xml:

<Manager className="org.redisson.tomcat.RedissonSessionManager"
          configPath="${catalina.base}/conf/redisson.yml" readMode="REDIS" updateMode="DEFAULT"/>

I am using redisson 3.7.4

[Yumar]

Te s

Jan 27, 2020 4:35:00 PM org.redisson.tomcat.RedissonSessionManager findSession INFO: Session E580CA0EC6780785207B12987B4DF18C can’t be found [redisson-netty-2-3] ERROR org.redisson.client.handler.CommandDecoder - Unable to decode data. channel: [id: 0x48f008af, L:/10.0.0.76:56574 - R:portalsessionmanagement.lcajar.ng.0001.euw2.cache.amazonaws.com/x.x.x.xxx:xxxx], reply: ReplayingDecoderByteBuf(ridx=404, widx=404), command: (HGET), params: [redisson:tomcat_session:4FEF283AAD7E9F22654781E1BB2CA857, PooledUnsafeDirectByteBuf(ridx: 0, widx: 17, cap: 256)] com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of fullclassname_0 (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 255] (through reference chain: fullclassname_1[“myFieldResponseMessages”]->fullclassname_2[“__GlobalMessages”]->java.util.ArrayList[0])

It says JacksonParser needs an empty constructor in your class to be able to decode it from json

[Yunixx]

Fix works well for me! Thanks @mrniko!