snicoll opened a new issue, #4001:
URL: https://github.com/apache/logging-log4j2/issues/4001
## Description
Apologizes for the lack of details but @ppkarwasz mentioned it could
reproduce the problem on their end.
I am configuring a `SizeBasedTriggeringPolicy` on a Spring Boot application
and rolling fails as follows:
```
2025-12-12T14:23:34.834545Z scheduling-1 ERROR An exception occurred
processing Appender File
java.lang.IndexOutOfBoundsException: No group 1
at java.base/java.util.regex.Matcher.checkGroup(Matcher.java:1845)
at java.base/java.util.regex.Matcher.group(Matcher.java:686)
at
org.apache.logging.log4j.core.appender.rolling.AbstractRolloverStrategy.getEligibleFiles(AbstractRolloverStrategy.java:144)
at
org.apache.logging.log4j.core.appender.rolling.AbstractRolloverStrategy.getEligibleFiles(AbstractRolloverStrategy.java:93)
at
org.apache.logging.log4j.core.appender.rolling.AbstractRolloverStrategy.getEligibleFiles(AbstractRolloverStrategy.java:85)
at
org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy.purgeAscending(DefaultRolloverStrategy.java:447)
at
org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy.purge(DefaultRolloverStrategy.java:431)
at
org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy.rollover(DefaultRolloverStrategy.java:571)
at
org.apache.logging.log4j.core.appender.rolling.RollingFileManager.rollover(RollingFileManager.java:619)
at
org.apache.logging.log4j.core.appender.rolling.RollingFileManager.rollover(RollingFileManager.java:507)
at
org.apache.logging.log4j.core.appender.rolling.RollingFileManager.checkRollover(RollingFileManager.java:418)
at
org.apache.logging.log4j.core.appender.RollingFileAppender.append(RollingFileAppender.java:336)
at
org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:160)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:133)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:124)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:88)
at
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:711)
at
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:669)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:645)
at
org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:702)
at
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:671)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:645)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:589)
at
org.apache.logging.log4j.core.config.DefaultReliabilityStrategy.log(DefaultReliabilityStrategy.java:73)
at org.apache.logging.log4j.core.Logger.log(Logger.java:187)
at
org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2970)
at
org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2922)
at
org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2904)
at
org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2653)
at
org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:2393)
at org.apache.logging.slf4j.Log4jLogger.debug(Log4jLogger.java:113)
```
When this happens logs to file stop.
## Configuration
Log4J 2.25.2, MacOS, JDK 25
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