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https://issues.apache.org/jira/browse/LOG4J2-772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092935#comment-14092935
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Ralph Goers commented on LOG4J2-772:
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Notice that the Object array and the formatted message member variables are
transient while the string array and message pattern are not. This means that
after the ParameterizedMessage is serialized it can only be formatted from the
string array. Of course, this means the string array must be populated before
the Message is serialized.
> Performance enhancement: ParameterizedMessage should not take String
> snapshots of its parameters in constructor
> ---------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-772
> URL: https://issues.apache.org/jira/browse/LOG4J2-772
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Affects Versions: 2.0, 2.0.1
> Reporter: Remko Popma
> Labels: Performance
>
> Discovered during investigation for LOG4J2-763, {{ParameterizedMessage}}
> currently initializes its {{String[] stringArgs}} field in the constructor.
> This may be wasted work if the message is not used, for example because the
> log level is below the filter threshold.
> The {{stringArgs}} field should be initialized in the {{getFormattedString}}
> method, not earlier.
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