# NotSerializableException

- **ID:** `java/notserializableexception`
- **Domain:** java
- **Category:** type_error
- **Error Code:** `NotSerializableException`
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Object does not implement java.io.Serializable when serialization is attempted.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 8+ | active | — | — |