RockteMQ-AI commented on issue #265:
URL:
https://github.com/apache/rocketmq-connect/issues/265#issuecomment-5771481047
**Issue Evaluation**
Category: `bug` | Status: **Confirmed**
This is a valid bug report. The `ClassCastException` occurs because
`WorkerTask#run()` attempts to cast a `Runnable` (returned by
`taskThread.getTask()`) to a `FutureTask`, which is an incompatible type.
**Root Cause:** Type mismatch in `WorkerTask#run()` — `taskThread.getTask()`
returns a `Runnable` but the code casts it to `FutureTask` without checking the
actual type.
**Impact:** Connector tasks crash at runtime with `ClassCastException`,
making the affected connectors non-functional.
**Severity:** High — complete failure of the affected connector task.
**Stack Trace Analysis:**
```
java.lang.ClassCastException: class java.lang.Runnable cannot be cast to
class java.util.concurrent.FutureTask
at
org.apache.rocketmq.connect.runtime.worker.WorkerTask.run(WorkerTask.java:102)
```
**Proposed Fix:** Either:
1. Change `taskThread.getTask()` to return `FutureTask` if that is the
intended type, or
2. Remove the cast and handle the `Runnable` directly, or
3. Add an `instanceof` check before casting.
A fix proposal has been filed in #266.
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