Edward Serebrinskiy created LOG4J2-1831:
-------------------------------------------

             Summary: NullPointerException in HtmlLayout
                 Key: LOG4J2-1831
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1831
             Project: Log4j 2
          Issue Type: Bug
          Components: Layouts
    Affects Versions: 2.8
            Reporter: Edward Serebrinskiy


Got following NullPointerException by using SMTP appender.


{code}
AsyncLogger error handling event seq=233, value='[ERROR calling class 
org.apache.logging.log4j.core.async.RingBufferLogEvent.toString(): 
java.lang.NullPointerException]':
org.apache.logging.log4j.core.appender.AppenderLoggingException: An exception 
occurred processing Appender Mail
        at 
org.apache.logging.log4j.core.appender.DefaultErrorHandler.error(DefaultErrorHandler.java:75)
        at 
org.apache.logging.log4j.core.config.AppenderControl.handleAppenderError(AppenderControl.java:165)
        at 
org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:158)
        at 
org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
        at 
org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
        at 
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
        at 
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
        at 
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
        at 
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
        at 
org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:79)
        at 
org.apache.logging.log4j.core.async.AsyncLogger.actualAsyncLog(AsyncLogger.java:337)
        at 
org.apache.logging.log4j.core.async.RingBufferLogEvent.execute(RingBufferLogEvent.java:156)
        at 
org.apache.logging.log4j.core.async.RingBufferLogEventHandler.onEvent(RingBufferLogEventHandler.java:45)
        at 
org.apache.logging.log4j.core.async.RingBufferLogEventHandler.onEvent(RingBufferLogEventHandler.java:29)
        at 
com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:129)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.logging.log4j.LoggingException: Error occurred while 
sending email
        at 
org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:175)
        at 
org.apache.logging.log4j.core.appender.SmtpAppender.append(SmtpAppender.java:181)
        at 
org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
        ... 15 more
Caused by: java.lang.NullPointerException
        at 
org.apache.logging.log4j.core.layout.HtmlLayout.toSerializable(HtmlLayout.java:170)
        at 
org.apache.logging.log4j.core.layout.HtmlLayout.toSerializable(HtmlLayout.java:50)
        at 
org.apache.logging.log4j.core.layout.AbstractStringLayout.toByteArray(AbstractStringLayout.java:301)
        at 
org.apache.logging.log4j.core.net.SmtpManager.writeBuffer(SmtpManager.java:204)
        at 
org.apache.logging.log4j.core.net.SmtpManager.writeContent(SmtpManager.java:190)
        at 
org.apache.logging.log4j.core.net.SmtpManager.formatContentToBytes(SmtpManager.java:182)
        at 
org.apache.logging.log4j.core.net.SmtpManager.sendEvents(SmtpManager.java:163)
        ... 17 more
{code}



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