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https://issues.apache.org/jira/browse/LOG4J2-169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587311#comment-13587311
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Gary Gregory commented on LOG4J2-169:
-------------------------------------
Using a CopyOnWriteArrayList seems like a brute force solution would generate a
lot of garbage when many loggers are added. My server at work uses 100's of
loggers.
The alternative would be to synchronize in just the right places, which is
harder to get right.
Ralph, any thoughts?
> LogManager.getLogger doesn't work
> ---------------------------------
>
> Key: LOG4J2-169
> URL: https://issues.apache.org/jira/browse/LOG4J2-169
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-beta4
> Reporter: Jed Wesley-Smith
> Priority: Critical
> Labels: thread-safety
>
> We randomly get the following:
> java.util.ConcurrentModificationException
> at
> org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:377)
> at
> org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:361)
> at
> org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:266)
> at
> org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:134)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:75)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:30)
> at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:165)
> at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:174)
> at …
> factories is defined as:
> private static List<ConfigurationFactory> factories = new
> ArrayList<ConfigurationFactory>();
> The simple fix is to use a java.util.concurrent.CopyOnWriteArrayList:
> private static final List<ConfigurationFactory> factories = new
> CopyOnWriteArrayList<ConfigurationFactory>();
> https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk/core/src/main/java/org/apache/logging/log4j/core/config/ConfigurationFactory.java
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