# CancellationException

- **ID:** `java/cancellationexception`
- **Domain:** java
- **Category:** runtime_error
- **Error Code:** `CancellationException`
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Task or Future was cancelled before completion.

## Version Compatibility

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