Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' - redis

Question

I am able to connect to Azure Cache for Redis with the following Spring Session configuration:
<bean id="redisPassword" class="org.springframework.data.redis.connection.RedisPassword">
<constructor-arg index="0" value="xxxxxxxxxxxxxxxx"/>
</bean>
<bean id="redisStandaloneConfiguration" class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
<property name="hostName" value="acmedev.redis.cache.windows.net"/>
<property name="port" value="6380"/>
<property name="password" ref="redisPassword"/>
</bean>
<context:annotation-config/>
<bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration"/>
<bean class="org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory">
<constructor-arg index="0" ref="redisStandaloneConfiguration"/>
</bean>
My app successfully connects:
[lettuce-nioEventLoop-4-1] DEBUG io.lettuce.core.RedisClient - Connecting to Redis at acmedev.redis.cache.windows.net:6380: Success
The app then hangs for a while and I eventually get this error
11:22:54.712 [lettuce-nioEventLoop-4-1] DEBUG io.lettuce.core.protocol.CommandHandler - [channel=0xcf902cd8, /10.1.200.58:53533 -> acmedev.redis.cache.windows.net/52.240.141.200:6380, chid=0x1] Storing exception in connectionError
2020-02-19 11:22:54,713 WARN (org.springframework.context.support.AbstractApplicationContext:558) || - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' defined in class path resource [org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to acmedev.redis.cache.windows.net:6380
11:22:54.719 [RMI TCP Connection(3)-127.0.0.1] DEBUG io.lettuce.core.RedisClient - Initiate shutdown (100, 100, MILLISECONDS)
[lettuce-nioEventLoop-4-1] DEBUG io.lettuce.core.protocol.CommandHandler - [channel=0xcf902cd8, /10.1.200.58:53533 -> acmedev.redis.cache.windows.net/52.240.141.200:6380, chid=0x1] Unexpected exception during request: java.io.IOException: An existing connection was forcibly closed by the remote host
java.io.IOException: An existing connection was forcibly closed by the remote host
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1133)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:745)
These same beans work just fine when I use redis running on localhost.
What am I doing wrong here?

Answer 1

First of all RedisHttpSessionConfiguration try(by default) enable keyspace notifications. But this is only working for not secured instances.
Docs form class ConfigureNotifyKeyspaceEventsAction
explain why it is work only on localhost:
This strategy will not work if the Redis instance has been properly secured. Instead,
the Redis instance should be configured externally and a Bean of type
ConfigureRedisAction#NO_OP should be exposed.
And also explain how it should be configured to work with secured Redis instance.
Simply use method: RedisHttpSessionConfiguration#setConfigureRedisAction
to set ConfigureRedisAction#NO_OP and then for example in your redis instance call: config set notify-keyspace-events Egx

Answer 2

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">
.
.
.
<util:constant id="configureRedisAction"
static-field="org.springframework.session.data.redis.config.ConfigureRedisAction.NO_OP"/>
<bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration" p:configureRedisAction-ref="configureRedisAction"/>