[jira] [Created] (IGNITE-19063) Fix incorrect behaviour of MemorizingAppender with MutableLogEvent

["Ilya Shishkov (Jira)" <ji...@apache.org>]

Ilya Shishkov created IGNITE-19063:
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             Summary: Fix incorrect behaviour of MemorizingAppender with MutableLogEvent
                 Key: IGNITE-19063
                 URL: https://issues.apache.org/jira/browse/IGNITE-19063
             Project: Ignite
          Issue Type: Test
            Reporter: Ilya Shishkov
         Attachments: MemorizingAppenderTest.patch

Since 2.6 version by default Log4j2 utilizes {{MutableLogEvent}} [1], which is a reusable implementation of {{LogEvent}}. 

Test Log4j2 appender {{MemorizingAppener}} in Ignite captures such events "as is", which can lead to mutation of captured events.

Currently, it is not happened, because Log4j2 implicitly considers, that it is initialized in web application environment, as we can see in static initialization of Log4j2 {{ReusableLogEventFactory}} and configuration constants and here: [2-5].

As we can see in [5], availability of {{javax.servlet.Servlet}} or {{jakarta.servlet.Servlet}} (the first one is available in Ignite) classes is a sufficient condition _to eliminate utilization of_ {{ReusableLogEventFactory}}.

If we turn off "web app mode" by setting up system property "log4j2.is.webapp" to "false", than events in {{MemorizingAppener}} will be mutated after some invocations of logger methods.

Here is a reproducer patch:  [^MemorizingAppenderTest.patch] 

Links:
 # https://issues.apache.org/jira/browse/LOG4J2-1334
 # [https://github.com/apache/logging-log4j2/blob/e8fba8caf1ffab6dc0161f8f48611dadedb86b2c/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LoggerConfig.java#L101]
 # [https://github.com/apache/logging-log4j2/blob/b69b7b802539d87aab6b51aca0a0df8a669ce6ee/log4j-core/src/main/java/org/apache/logging/log4j/core/util/Constants.java#L90]
 # [https://github.com/apache/logging-log4j2/blob/c6fd104ebc14d53ea2adce9f9e6fde9a167529b4/log4j-api/src/main/java/org/apache/logging/log4j/util/Constants.java#L41]
 # [https://github.com/apache/logging-log4j2/blob/c6fd104ebc14d53ea2adce9f9e6fde9a167529b4/log4j-api/src/main/java/org/apache/logging/log4j/util/Constants.java#L30]



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