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  InvalidObjectException: ReflectionOperationException During Deserialization – How Upgrading Scala Fixes the Error When working with Scala applications, especially in distributed systems or serialization-heavy environments, you may encounter the following runtime error: java.io.InvalidObjectException: ReflectionOperationException during deserialization This typically appears when Scala attempts to deserialize an object that was serialized using an incompatible or outdated version of Scala or its reflection APIs. In this article, we explore the root cause of this error and how upgrading the Scala version resolves it. What Causes InvalidObjectException: ReflectionOperationException ? This error occurs during object deserialization when: Reflection APIs change between Scala versions. Serialized data is created under an older Scala version. Scala libraries or dependencies use mismatched binary versions. Internal reflection logic fails due to outdated metadata. Sc...