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https://issues.apache.org/jira/browse/LOG4J2-1688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15654291#comment-15654291
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Stefan Hammelbeck commented on LOG4J2-1688:
-------------------------------------------
The actual reset seems to happen in {{ReusableLogEventFactory}}:
{code}
...
@Override
public LogEvent createEvent(final String loggerName, final Marker marker,
final String fqcn, final Level level, final
Message message,
final List<Property> properties, final
Throwable t) {
MutableLogEvent result = mutableLogEventThreadLocal.get();
if (result == null || result.reserved) {
final boolean initThreadLocal = result == null;
result = new MutableLogEvent();
// usually no need to re-initialize thread-specific fields since
the event is stored in a ThreadLocal
result.setThreadId(Thread.currentThread().getId());
result.setThreadName(Thread.currentThread().getName()); //
Thread.getName() allocates Objects on each call
result.setThreadPriority(Thread.currentThread().getPriority());
if (initThreadLocal) {
mutableLogEventThreadLocal.set(result);
}
}
result.reserved = true;
result.clear(); // ensure any previously cached values (thrownProxy,
source, etc.) are cleared
result.setLoggerName(loggerName);
result.setMarker(marker);
...
{code}
The call {{result.clear()}} resets the argument-array based on data managed
{{MutableLogEvent}}
> Multiple loggings of arguments are setting these arguments to null
> ------------------------------------------------------------------
>
> Key: LOG4J2-1688
> URL: https://issues.apache.org/jira/browse/LOG4J2-1688
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.7
> Reporter: Stefan Hammelbeck
>
> We are using SLF4J over log4j Version 2.7.
> Calling {{org.slf4j.Logger.error(someFormat, args)}} *twice* with an
> {{Object[] args}} causes all elements of {{args}} to be set to {{null}}.
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