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Posted to commits@camel.apache.org by "gnodet (via GitHub)" <gi...@apache.org> on 2026/05/22 04:55:36 UTC
[PR] Revert JLine from 4.1.0 to 4.0.15 to fix camel shell immediate exit [camel]
gnodet opened a new pull request, #23446:
URL: https://github.com/apache/camel/pull/23446
## Summary
- Reverts JLine from 4.1.0 to 4.0.15 to fix `camel shell` exiting immediately after printing the banner.
## Root cause
JLine 4.1.0 introduced `AbstractUnixSysTerminal`, which bypasses the PTY abstraction and reads directly from `new FileInputStream(FileDescriptor.in)`. Combined with a latent bug in `enterRawMode()` that sets `VMIN=0, VTIME=1` (instead of the POSIX `cfmakeraw` defaults `VMIN=1, VTIME=0`), the kernel returns 0 bytes from `read()` after 100ms idle. Java's `FileInputStream.read()` translates a 0-byte return into `-1` (EOF), causing JLine's `readLine()` to throw `EndOfFileException` and the shell REPL to exit silently.
JLine 4.0.15 uses PTY-backed I/O (`pty.getSlaveInput()`) which handles 0-byte returns correctly, so the shell works as expected.
The upstream fix is in [JLine PR #1871](https://github.com/jline/jline3/pull/1871) (`VMIN=1, VTIME=0`) but has not been released yet. Once a JLine release includes this fix, we can upgrade again.
## Test plan
- [x] `camel shell` stays open and accepts commands (tested with both 4.0.15 and the SNAPSHOT with the fix)
- [ ] CI passes
_Claude Code on behalf of Guillaume Nodet_
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Re: [PR] Revert JLine from 4.1.0 to 4.0.15 to fix camel shell immediate exit [camel]
Posted by "davsclaus (via GitHub)" <gi...@apache.org>.
davsclaus commented on PR #23446:
URL: https://github.com/apache/camel/pull/23446#issuecomment-4515124325
just note deprendabot will keep raising PRs so we need to deny those until a working 4.1.x is released
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Re: [PR] Revert JLine from 4.1.0 to 4.0.15 to fix camel shell immediate exit [camel]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #23446:
URL: https://github.com/apache/camel/pull/23446#issuecomment-4515100741
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Re: [PR] Revert JLine from 4.1.0 to 4.0.15 to fix camel shell immediate exit [camel]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #23446:
URL: https://github.com/apache/camel/pull/23446#issuecomment-4515230812
<!-- ci-tested-modules -->
:test_tube: **CI tested the following changed modules:**
- `parent`
:white_check_mark: **POM dependency changes: targeted tests included**
Changed properties: jline-version
<details><summary>Modules affected by dependency changes (1)</summary>
- `:camel-diagram`
</details>
<details><summary>All tested modules (2 modules)</summary>
- Camel :: Diagram
- Camel :: Parent
</details>
---
:gear: [View full build and test results](https://github.com/apache/camel/actions/runs/26269225165)
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Re: [PR] Revert JLine from 4.1.0 to 4.0.15 to fix camel shell immediate exit [camel]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet merged PR #23446:
URL: https://github.com/apache/camel/pull/23446
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