That is a good question. Most of the converters simply don't add anything to the buffer if they have no content, but "null" isn't necessarily the same thing as no content.
Ralph On Jan 10, 2013, at 12:33 PM, Gary Gregory wrote: > What should be the expected output? "null" or a no-op? > > Gary > > > On Thu, Jan 10, 2013 at 6:42 AM, Christian Grobmeier <[email protected]> > wrote: > Folks, > > i am doing this: > > logger.debug(line) > > where line is null. Please not, if I do sysout(line) before the error > does not happen. > > The exception is below. I believe it is because: > > toAppendTo.append(config != null && result.contains("${") ? > config.getSubst().replace(event, result) : result); > > > toAppendTo is null when I put null into .debug thus it crashes. > Shouldn't it be nullsafe? I can imagine people are putting null into > that messages. > > Cheers > Christian > > > ERROR StatusLogger An exception occurred processing Appender STDOUT > java.lang.NullPointerException > at > org.apache.logging.log4j.core.pattern.MessagePatternConverter.format(MessagePatternConverter.java:70) > at > org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:36) > at > org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:141) > at > org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:48) > at > org.apache.logging.log4j.core.layout.AbstractStringLayout.toByteArray(AbstractStringLayout.java:56) > at > org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:112) > at > org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:98) > at > org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:335) > at > org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:316) > at > org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:319) > at > org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:281) > at org.apache.logging.log4j.core.Logger.log(Logger.java:106) > at > org.apache.logging.log4j.spi.AbstractLoggerWrapper.log(AbstractLoggerWrapper.java:53) > at org.slf4j.impl.SLF4JLogger.debug(SLF4JLogger.java:129) > > -- > http://www.grobmeier.de > https://www.timeandbill.de > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > > > > -- > E-Mail: [email protected] | [email protected] > JUnit in Action, 2nd Ed: http://bit.ly/ECvg0 > Spring Batch in Action: http://bit.ly/bqpbCK > Blog: http://garygregory.wordpress.com > Home: http://garygregory.com/ > Tweet! http://twitter.com/GaryGregory
