Shan Jiang created COMMONSSITE-186:
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Summary: apache/commons-codec — BaseNCodecOutputStream.close() not
idempotent
Key: COMMONSSITE-186
URL: https://issues.apache.org/jira/browse/COMMONSSITE-186
Project: Apache Commons All
Issue Type: Bug
Reporter: Shan Jiang
`BaseNCodecOutputStream.close()` throws on second call — violates Closeable
idempotency contract
### Summary
`BaseNCodecOutputStream.close()` is not idempotent: the second call attempts to
flush to an already-closed underlying stream, throwing `IOException`. The
`Closeable` contract (JDK 21 Javadoc) states: "If the stream is already closed
then invoking this method has no effect."
### How this was found
Detected by automated JDK conformance oracle (`checkCloseIdempotent`).
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