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https://issues.apache.org/jira/browse/LOG4J2-1608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515618#comment-15515618
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Remko Popma commented on LOG4J2-1608:
-------------------------------------
Was this resolved now? (Jira ticket status is still Reopened)
> ServletAppender does not provide throwable object to ServletContext
> -------------------------------------------------------------------
>
> Key: LOG4J2-1608
> URL: https://issues.apache.org/jira/browse/LOG4J2-1608
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.6.2
> Reporter: Gary Gregory
> Assignee: Gary Gregory
> Fix For: 2.7
>
>
> The method
> {{org.apache.logging.log4j.web.appender.ServletAppender.append(LogEvent)}} is
> defined as:
> {code:java}
> @Override
> public void append(final LogEvent event) {
> servletContext.log(((AbstractStringLayout)
> getLayout()).toSerializable(event));
> }
> {code}
> Instead of:
> {code:java}
> @Override
> public void append(final LogEvent event) {
> servletContext.log(((AbstractStringLayout)
> getLayout()).toSerializable(event), event.getThrown());
> }
> {code}
> We should use {{javax.servlet.ServletContext.log(String, Throwable)}} instead
> of {{javax.servlet.ServletContext.log(String)}}.
> We do not give the best information we have to the servlet context logging.
> The tricky part is that to avoid logging the exception twice like in our test
> {{org.apache.logging.log4j.web.ServletAppenderTest}}. To avoid the double
> logging, we could (1) document not using a %exception in the pattern layout.
> That or (yikes) (2) provide a variation of the toSerializable(event) like
> toSerializable(event, false), where the boolean is an ignoreException
> parameter. It seems there are plenty of places where exceptions are treated
> specially already, this would be another.
> I like (1) better because it is simpler.
> In addition the test and documentation should mention the use of
> {{%ex\{none\}}} to avoid appending exceptions to messages when using the
> ServletAppender.
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