Seyguai created LOG4J2-180:
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Summary: 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}")
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
}
...
}
(With style or highlight patterns, the format is called with a new -empty-
StringBuilder)
Example:
17:26:54.395 ERROR # Server.doOperation catchingjava.lang.NullPointerException
(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:
Simple pattern: "%m %ex{short}"
Output: catching java.lang.NullPointerException
at net.wm.core.prototype.Server.doOperation(Server.java:27)
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]
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