cuihaohao opened a new issue, #2326:
URL: https://github.com/apache/fory/issues/2326
### Question
I’m encountering a ClassCastException when using Fury with
withAsyncCompilation(true) enabled. The issue only happens during the first
serialization and does not occur when I disable async compilation
(withAsyncCompilation(false)). The environment is a large-scale Java service
deployed on a server; the issue doesn’t reproduce in minimal test cases locally.
💡 Setup:
• Fury version: 0.4.1
• Language: Java
• RPC framework: [Motan](https://github.com/weibocom/motan)
• Serialization configuration:
`Fury.builder()
.withLanguage(Language.JAVA)
.withRefTracking(true)
.requireClassRegistration(false)
.withAsyncCompilation(true)
.withCompatibleMode(CompatibleMode.COMPATIBLE)
.withDeserializeUnexistedClass(true)
.buildThreadSafeFury();`
Exception:
`Caused by: java.lang.ClassCastException: com.ch.businessModel.PetInfo
cannot be cast to java.lang.Integer
at
io.fury.serializer.PrimitiveSerializers$IntSerializer.write(PrimitiveSerializers.java:161)
at
io.fury.serializer.collection.AbstractCollectionSerializer.compatibleWrite(AbstractCollectionSerializer.java:338)
at
io.fury.serializer.collection.AbstractCollectionSerializer.writeElements(AbstractCollectionSerializer.java:314)
at
io.fury.serializer.collection.AbstractCollectionSerializer.write(AbstractCollectionSerializer.java:296)
at io.fury.Fury.writeNonRef(Fury.java:442)
at
io.fury.serializer.CompatibleSerializer.writeSeparateFieldValue(CompatibleSerializer.java:218)
at
io.fury.serializer.CompatibleSerializer.readAndWriteFieldValue(CompatibleSerializer.java:153)
at
io.fury.serializer.CompatibleSerializer.write(CompatibleSerializer.java:108)
at io.fury.Fury.writeData(Fury.java:551)
at io.fury.Fury.writeRef(Fury.java:344)
at io.fury.Fury.write(Fury.java:319)
at io.fury.Fury.serialize(Fury.java:255)
at io.fury.Fury.serialize(Fury.java:221)
at io.fury.ThreadLocalFury.serialize(ThreadLocalFury.java:67)
at
com.ch.serialize.FurySerialization.serialize(FurySerialization.java:39)
at com.ch.codec.MotanV2ECodec.encode(MotanV2ECodec.java:137)
...`
Model Structure:
One of the RPC response objects includes:
`private List<PetInfo> petInfoList;`
Where PetInfo is a regular POJO in com.ch.businessModel.
❓ My Questions:
1. What might be causing this ClassCastException during async
compilation?
2. Is this issue related to Java’s type erasure or generic types
in collections?
3. Could this be a race condition or incorrect type inference
during Fury’s async class generation?
4. Is there any recommended workaround until the root cause is
fixed?
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