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Posted to commits@fury.apache.org by "davidnadeau (via GitHub)" <gi...@apache.org> on 2025/01/23 22:52:49 UTC
[I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
davidnadeau opened a new issue, #2021:
URL: https://github.com/apache/fury/issues/2021
### Search before asking
- [x] I had searched in the [issues](https://github.com/apache/fury/issues) and found no similar issues.
### Version
0.9.0
### Component(s)
Other, Java
### Minimal reproduce step
I am trying to deserialize into the scala type: Map[String, String].
### What did you expect to see?
No error
### What did you see instead?
```
Failed to deserialize key:
* binary data *
due to exception: java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory (scala.collection.immutable.HashMap and scala.collection.Factory are in unnamed module of loader 'app')"
```
### Anything Else?
I do not see any errors like this in version 0.7.0. In 0.9.0 i've started using the new Scala serializers
```scala
import org.apache.fury.serializer.scala.ScalaSerializers
ScalaSerializers.registerSerializers(fury)
```
I think there is an issue with the scala serializers.
### Are you willing to submit a PR?
- [ ] I'm willing to submit a PR!
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "chaokunyang (via GitHub)" <gi...@apache.org>.
chaokunyang commented on issue #2021:
URL: https://github.com/apache/fury/issues/2021#issuecomment-2613763208
Hi @davidnadeau , I tested HashMap with jdk 21, it still works:
```scala
val v = scala.collection.immutable.HashMap("k1" -> "v1", "k2" -> "v2")
fury.deserialize(fury.serialize(v)) shouldEqual v
```
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "chaokunyang (via GitHub)" <gi...@apache.org>.
chaokunyang commented on issue #2021:
URL: https://github.com/apache/fury/issues/2021#issuecomment-2611661293
@davidnadeau could you provide reproduction code?
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "davidnadeau (via GitHub)" <gi...@apache.org>.
davidnadeau commented on issue #2021:
URL: https://github.com/apache/fury/issues/2021#issuecomment-2637980075
Thanks for checking @chaokunyang , I have not been able to reproduce this issue in my test environment. I'll close the ticket for now, and re-open it with more details if I find something interesting.
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "davidnadeau (via GitHub)" <gi...@apache.org>.
davidnadeau closed issue #2021: java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory
URL: https://github.com/apache/fury/issues/2021
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "davidnadeau (via GitHub)" <gi...@apache.org>.
davidnadeau commented on issue #2021:
URL: https://github.com/apache/fury/issues/2021#issuecomment-2612825203
Hi @chaokunyang my fury config looks like:
```scala
val fury = Fury
.builder()
.withLanguage(Language.JAVA)
.withScalaOptimizationEnabled(true)
.requireClassRegistration(false)
.withRefTracking(false)
.buildThreadSafeFuryPool(Runtime.getRuntime.availableProcessors() * 2, Runtime.getRuntime.availableProcessors() * 2)
ScalaSerializers.registerSerializers(fury)
```
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Re: [I] java.lang.ClassCastException: class scala.collection.immutable.HashMap cannot be cast to class scala.collection.Factory [fury]
Posted by "davidnadeau (via GitHub)" <gi...@apache.org>.
davidnadeau commented on issue #2021:
URL: https://github.com/apache/fury/issues/2021#issuecomment-2612850627
I am working to provide more details. I want to test 3 scenarios:
1. jdk 21 fury 0.9.0 fury_core dep
2. jdk 21 fury 0.9.0 fury_scala dep (no scala serializers)
3. jdk 21 fury 0.9.0 fury_scala dep + scala serializers
I will report back my findings. And try to provide a more detailed reproduction code, however I have a suspicion that it may be a thread race condition. Alongside the failures to deserialize I also saw other errors.
```
java.lang.ArrayIndexOutOfBoundsException
```
and
```
ERROR ThreadPoolFury:84 [finagle/netty4-1-49] - null
java.lang.NullPointerException
```
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