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[karaf-4.4.x] Catch StringIndexOutOfBoundException in ConsoleSessionImpl to workaround an issue in JLine #2242

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Merged
jbonofre merged 1 commit into from
Jan 28, 2026
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[karaf-4.4.x] Catch StringIndexOutOfBoundException in ConsoleSessionImpl to workaround an issue in JLine #2242

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6 changes: 6 additions & 0 deletions shell/core/src/main/java/org/apache/karaf/shell/impl/console/ConsoleSessionImpl.java
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Original file line number Diff line number Diff line change
Expand Up @@ -465,6 +465,12 @@ private CharSequence readCommand(AtomicBoolean reading) throws UserInterruptExce
}
} catch (UserInterruptException e) {
command = ""; // Do nothing
} catch (StringIndexOutOfBoundsException e) {
// Workaround for JLine CompletionMatcherImpl bug: Tab on empty line triggers
// substring(0, 1) on "" in defaultMatchers() before EMPTY_WORD_OPTIONS check.
// Re-prompt instead of exiting the shell.
LOGGER.debug("Completion on empty line triggered known JLine edge case", e);
command = "";
} catch (Throwable t) {
ShellUtil.logException(this, t);
} finally {
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