IllegalArgumentException after upgrading to latest version

Bug Report

Current Behavior

Since upgrading to 0.6.1-RELEASE we are seeing a runtime exception.

We have a test suite which tests a custom Scala wrapper of lettuce that we have built.

We are seeing some weird behaviour when we update to the latest stable version.

After starting up sbt; running our tests for the first time will not show the error, but any subsequent runs will fail before any of the tests run, throwing the below error. If we wait a minute or so and run the tests again the error will not throw the first time, before subsequently failing.

 IllegalArgumentException: java.lang.ClassCastException@57a480c4
[error]
[error]   null:-1                                      sun.reflect.GeneratedConstructorAccessor191#newInstance
[error]   DelegatingConstructorAccessorImpl.java:45    sun.reflect.DelegatingConstructorAccessorImpl#newInstance
[error]   Constructor.java:423                         java.lang.reflect.Constructor#newInstance
[error]   JfrEventRecorder.java:108                    io.lettuce.core.event.jfr.JfrEventRecorder#createEvent
[error]   JfrEventRecorder.java:48                     io.lettuce.core.event.jfr.JfrEventRecorder#record
[error]   AbstractRedisClient.java:376                 io.lettuce.core.AbstractRedisClient#initializeChannelAsync
[error]   RedisClient.java:325                         io.lettuce.core.RedisClient#connectStatefulAsync
[error]   RedisClient.java:287                         io.lettuce.core.RedisClient#connectStandaloneAsync
[error]   RedisClient.java:264                         io.lettuce.core.RedisClient#connectAsync

Input Code

We create the client like so:

RedisClient.create()

We create an async bounded connection pool like this:

AsyncConnectionPoolSupport
  .createBoundedObjectPoolAsync(
     new Supplier[java.util.concurrent.CompletionStage[StatefulRedisConnection[String, String]]] {
       def get(): ConnectionFuture[StatefulRedisConnection[String, String]] =
         client.connectAsync(StringCodec.UTF8, RedisURI.create(config.host, config.port))
     },

Expected behavior/code

Expect this error to not occur.

Environment

• Lettuce: 6.1.0.RELEASE
• Redis Bloom version: 2.2.5
• Scala version: 2.13.4
• Java version: I’ve tried 8,11 & 13
• Sbt version: 1.5.0

Possible Solution

N/A

Additional context

This is the Redis Bloom module, running in a Docker container.

PS: Thanks for builing lettuce!

[mcgizzle]

You were indeed correct about it being a class loaders issue, thanks for the hint!

I am straying into unfamilair teritories here, but after reading this I changed the strategy to:

Flat - No layering is used. The full classpath, as specified by the fullClasspath key of the task is loaded in the outermost layer. Consider using as an alternative to fork if any issues are experienced with ScalaLibrary or if the application requires all classes to be loaded in the same ClassLoader, which may be the case for some uses of java serialization.

And the error disapeared!

My IDE uses jdk.internal.loader.ClassLoaders while sbt uses its own class loader, which explains why it wasn’t failing there.

I’m going to do some investigation into class loaders to see what this all means…

[mp911de]

Thanks for the update. It sounds a bit as if class loaders are involved. Moving on with the 6.1.1 release as we cannot do here anything short-term.