[LOG4J2-1142] ThreadLocals in Layout implementations may cause memory leaks in web containers

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4
• Fix Version/s: 2.4.1
• Component/s: Layouts
• Assignee: Remko Popma
• Reporter: Dmitri Blinov
• Created: 30/Sep/15 21:24
• Updated: 16/Jun/16 22:53
• Resolved: 03/Oct/15 23:35

Description

As discussed in LOG4J2-1125, storing ThreadLocal<StringBuilder> in a static field may not interact well with the thread pools and class loaders of some web containers and may result in memory leaks, especially in older web containers.

Issue Links

• is broken by: LOG4J2-1125 Reuse StringBuilder to improve performance for PatternLayout