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Replace thread-unsafe SimpleDateFormat with DateTimeFormatter in AbstractMockHttpServletRequestBuilder - #36772
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bclozel merged 1 commit intoSep 4, 2026
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The static SimpleDateFormat instance in AbstractMockHttpServletRequestBuilder is shared across all instances. SimpleDateFormat.format() mutates internal Calendar state and is not thread-safe, which can produce corrupt date strings or ArrayIndexOutOfBoundsException when tests run in parallel. Replace with DateTimeFormatter which is immutable and thread-safe. Signed-off-by: Sebastien Tardif <SebTardif@ncf.ca>
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Thanks @SebTardif ! |
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Summary
Replace the static
SimpleDateFormatinstance with a thread-safeDateTimeFormatterinAbstractMockHttpServletRequestBuilder.Problem
A
static final SimpleDateFormatis shared across all test request builder instances.SimpleDateFormat.format()mutates internalCalendarstate and is not thread-safe. When tests run in parallel (e.g., with JUnit's@Execution(CONCURRENT)), concurrent calls toheader(name, dateValue)can produce corrupt date strings or throwArrayIndexOutOfBoundsException.Fix
Replace with
DateTimeFormatter.ofPattern(...)using the same pattern (EEE, dd MMM yyyy HH:mm:ss zzz), locale (US), and timezone (UTC).DateTimeFormatteris immutable and thread-safe by design.