[jira] [Created] (LOG4J2-180) style & highlight patterns altering content behaviour

["Seyguai (JIRA)" <ji...@apache.org>]

Seyguai created LOG4J2-180:
------------------------------

             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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