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https://issues.apache.org/jira/browse/LOG4J2-1078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14618521#comment-14618521
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Mikael Ståldal commented on LOG4J2-1078:
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Shouldn't we set the message to "null" (rather than the empty string) if it's
null? That's how PatternLayout works.
> GelfLayout throws exception if some log event fields are null
> -------------------------------------------------------------
>
> Key: LOG4J2-1078
> URL: https://issues.apache.org/jira/browse/LOG4J2-1078
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.3
> Reporter: Mikael Ståldal
> Fix For: 2.4
>
>
> When log message is null:
> {code}
> 2015-07-08 11:07:41,761 ERROR An exception occurred processing Appender
> Console java.lang.NullPointerException
> at
> com.fasterxml.jackson.core.io.JsonStringEncoder.quoteAsString(JsonStringEncoder.java:106)
> at
> org.apache.logging.log4j.core.layout.GelfLayout.toSerializable(GelfLayout.java:217)
> at
> org.apache.logging.log4j.core.layout.GelfLayout.toByteArray(GelfLayout.java:184)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:108)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:99)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:430)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:409)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367)
> at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:112)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:727)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:716)
> {code}
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