'Command DEL does not exist' when using redis as cache

[vnesek]

Micronaut 1.3.5
Micronaut redis lettuce 2.0.0

When starting up application with @Cacheable annotated methods and redis cache configuration, following exception happens:

15:49:13.984 [pool-1-thread-6] | ERROR i.m.h.s.netty.RoutingInBoundHandler - Unexpected error occurred: Command DEL does not exist Offending method: public abstract java.lang.Long io.micronaut.configuration.lettuce.cache.SyncCacheCommands.del(byte[]...)
io.lettuce.core.dynamic.CommandMethodSyntaxException: Command DEL does not exist Offending method: public abstract java.lang.Long io.micronaut.configuration.lettuce.cache.SyncCacheCommands.del(byte[]...)
	at io.lettuce.core.dynamic.DefaultCommandMethodVerifier.syntaxException(DefaultCommandMethodVerifier.java:165)
	at io.lettuce.core.dynamic.DefaultCommandMethodVerifier.lambda$validate$0(DefaultCommandMethodVerifier.java:70)
	at java.base/java.util.Optional.orElseThrow(Optional.java:401)
	at io.lettuce.core.dynamic.DefaultCommandMethodVerifier.validate(DefaultCommandMethodVerifier.java:69)
	at io.lettuce.core.dynamic.ExecutableCommandLookupStrategySupport$DefaultCommandFactoryResolver.resolveRedisCommandFactory(ExecutableCommandLookupStrategySupport.java:74)
	at io.lettuce.core.dynamic.ExecutableCommandLookupStrategySupport.resolveCommandFactory(ExecutableCommandLookupStrategySupport.java:48)
	at io.lettuce.core.dynamic.AsyncExecutableCommandLookupStrategy.resolveCommandMethod(AsyncExecutableCommandLookupStrategy.java:47)
	at io.lettuce.core.dynamic.RedisCommandFactory$CompositeCommandLookupStrategy.resolveCommandMethod(RedisCommandFactory.java:290)
	at io.lettuce.core.dynamic.RedisCommandFactory$BatchAwareCommandLookupStrategy.resolveCommandMethod(RedisCommandFactory.java:339)
	at io.lettuce.core.dynamic.RedisCommandFactory$CommandFactoryExecutorMethodInterceptor.<init>(RedisCommandFactory.java:215)
	at io.lettuce.core.dynamic.RedisCommandFactory.getCommands(RedisCommandFactory.java:195)
	at io.micronaut.configuration.lettuce.cache.RedisCache.syncCommands(RedisCache.java:298)
	at io.micronaut.configuration.lettuce.cache.RedisCache.getCommands(RedisCache.java:149)
	at io.micronaut.configuration.lettuce.cache.RedisCache.get(RedisCache.java:168)
	at io.micronaut.cache.interceptor.CacheInterceptor.interceptSync(CacheInterceptor.java:174)
	at io.micronaut.cache.interceptor.CacheInterceptor.intercept(CacheInterceptor.java:125)
	at io.micronaut.aop.chain.MethodInterceptorChain.proceed(MethodInterceptorChain.java:69)
	at net.photomath.turk.service.$ClusterStateServiceDefinition$Intercepted.getClusterState(Unknown Source)
	at net.photomath.turk.service.ClusterStateService.updateClusterState(ClusterStateService.kt:84)
	at net.photomath.turk.service.ClusterStateService.setLimits(ClusterStateService.kt:77)

[graemerocher]

Can you provide an example that reproduces the issue? Cannot reproduce this myself

[vnesek]

Here is a minimal sample reproducing issue. Project created with micronaut launch, set micronaut version to 1.3.5, run vanilla redis in docker on localhost.

Apparently, it trips over redis.caches. configuration. Perhaps it's some typo I can't see.

package com.foo

import io.micronaut.cache.annotation.Cacheable
import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get
import io.micronaut.runtime.Micronaut
import io.micronaut.scheduling.annotation.Scheduled
import javax.annotation.security.PermitAll
import javax.inject.Singleton
import kotlin.random.Random

@Singleton
open class FooService {

    @Cacheable("my-cache")
    open fun foo(): Int {
        return Random.nextInt()
    }

    @Scheduled(fixedDelay = "60s", initialDelay = "1s")
    open fun autoFail() {
        // Comment out line bellow to get it to work
        foo()
    }
}

@Controller("/api/foo")
@PermitAll
open class FooController(val foo: FooService) {

    @Get
    fun fail() = foo.foo()
}

fun main() {
    Micronaut.build()
        .packages("com.foo")
        .mainClass(FooService::class.java)
        .start()
}

micronaut:
  application:
    name: redisfail
redis:
  uri: redis://localhost
  # Comment out 'caches' section to get it to work
  caches:
    my-cache:
      # expire one hour after write
      expire-after-write: 1h

[jopvanraaij]

Had the same issue (using Micronaut 1.3.4, Lettuce 1.2.0), but it was resolved when using Redis docker image redis:5.0.6-alpine instead of redis:5.0.7-alpine (latest and 6 were also failing).

[vnesek]

I can confirm that using redis:5.0.6-alpine image works, while newer versions don't. Haven't find anything similiar in lettuce issue tracker. Perhaps some command (DEL?) definitions changed in redis 5.0.6+.

[graemerocher]

Thanks that is useful information in helping us track this issue down.

[graemerocher]

Can you test the 2.3.1 version to see if the issue is resolved for you?

[sdelamo]

Attached a ZIP file with a micronaut1.3.4 which reproduces the issue and a Micronaut 2.0 which does not exhibit the issue.

I used redis 6.0.5 for both.

redisdemo.zip