[LOG4J2-177] ERROR StatusLogger An exception occurred processing Appender udpsocket java.lang.NullPointerException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0-beta4
• Fix Version/s: 2.0-beta5
• Component/s: Appenders
• Assignee: Ralph Goers
• Reporter: Aaron Daniels
• Created: 15/Mar/13 21:18
• Updated: 26/Mar/13 20:53
• Resolved: 25/Mar/13 00:58

Description

This seems to be a race condition of some kind. Two threads are exiting at almost exactly the same time, and both print a message as they exit. This exception happens every 3 or 4 times the code is run, so it's easily reproducible.

ERROR StatusLogger An exception occurred processing Appender udpsocket java.lang.NullPointerException
at org.apache.logging.log4j.core.net.DatagramOutputStream.flush(DatagramOutputStream.java:93)
at org.apache.logging.log4j.core.appender.OutputStreamManager.flush(OutputStreamManager.java:146)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:117)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
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:281)
at org.apache.logging.log4j.core.Logger.log(Logger.java:108)
at org.apache.logging.log4j.spi.AbstractLogger.trace(AbstractLogger.java:250)
at com.galmont.automation.framework.gui.handlers.RunCycleHandler$2.run(RunCycleHandler.java:128)
at java.lang.Thread.run(Unknown Source)

My configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="OFF">

<appenders>
<Console name="console" target="SYSTEM_OUT">
<PatternLayout pattern="%d

{HH:mm:ss.SSS}

[%t] %-5level %logger

{36} - %msg%n" />
</Console>
<Socket name="udpsocket" host="localhost" port="90" protocol="UDP">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36}

- %msg%n" />
</Socket>
<RollingFile name="RollingFile" fileName="logs/app.log" filePattern="logs/$${date:yyyy-MM}/app-%d

{MM-dd-yyyy}

-%i.log.gz">
<PatternLayout pattern="%d

{HH:mm:ss.SSS}

[%t] %-5level %logger

{36}

- %msg%n" />
<Policies>
<SizeBasedTriggeringPolicy size="20 MB" />
</Policies>
</RollingFile>
</appenders>

<loggers>
<root level="trace">
<appender-ref ref="console" />
<appender-ref ref="udpsocket" />
<appender-ref ref="RollingFile" />
</root>
</loggers>

</configuration>