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https://issues.apache.org/jira/browse/LOG4J2-180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748745#comment-13748745
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Gary Gregory commented on LOG4J2-180:
-------------------------------------
The second issue has been fixed as [LOG4J2-319].
> style & highlight patterns altering content behaviour
> -----------------------------------------------------
>
> Key: LOG4J2-180
> URL: https://issues.apache.org/jira/browse/LOG4J2-180
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.0-beta4
> Reporter: Seyguai
> Priority: Minor
>
> - Using style or highlight patterns over a Throwable pattern makes this code
> useless if the exception is the only content (i.e. "%highlight{%ex}")
> {code:java}
> org.apache.logging.log4j.core.pattern.ThrowablePatternConverter:format(final
> LogEvent event, final StringBuilder toAppendTo) {
> ...
> final int len = toAppendTo.length();
> if (len > 0 && !Character.isWhitespace(toAppendTo.charAt(len -
> 1))) {
> toAppendTo.append(" "); // Add a space before printing stack
> trace
> }
> ...
> }
> {code}
> (With style or highlight patterns, the format is called with a new empty
> StringBuilder)
> Example:
> {noformat}
> 17:26:54.395 ERROR # Server.doOperation catchingjava.lang.NullPointerException
> {noformat}
> (Syntax affected, no space between the message 'catching' and the exception
> 'java.lang.NullPointerException')
> - Using style or highlight patterns over a Throwable pattern makes it to be
> duplicated (the pattern is interpreted as if there was nothing dealing with
> throwables)
> Examples:
> {noformat}
> Simple pattern: "%m %ex{short}"
> Output: catching java.lang.NullPointerException
> at net.wm.core.prototype.Server.doOperation(Server.java:27)
> {noformat}
> {noformat}
> Pattern with highlight: "%m %highlight{%ex{short}}"
> Output: catching java.lang.NullPointerException
> at net.wm.core.prototype.Server.doOperation(Server.java:27)
> java.lang.NullPointerException
> at net.wm.core.prototype.Server.doOperation(Server.java:27) [bin/:?]
> at net.wm.core.AbstractOperation.run(AbstractOperation.java:99)
> [bin/:?]
> at java.lang.Thread.run(Unknown Source) [?:1.7.0_07]
> {noformat}
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