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https://issues.apache.org/jira/browse/LOG4J2-1988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168059#comment-16168059
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Remko Popma edited comment on LOG4J2-1988 at 9/15/17 3:52 PM:
--------------------------------------------------------------
Fixed in master.
I was able to add a test that reproduces the issue, and with the fix the
exception no longer occurs.
Please verify and close.
was (Author: rem...@yahoo.com):
Fixed in master.
I was able to add a test that reproduces the issue, and with the fix the
exception no longer occurs.
> java.util.ConcurrentModificationException with AsyncLogger?
> -----------------------------------------------------------
>
> Key: LOG4J2-1988
> URL: https://issues.apache.org/jira/browse/LOG4J2-1988
> Project: Log4j 2
> Issue Type: Question
> Components: Layouts
> Affects Versions: 2.8.2
> Environment: Java 1.8.0_111, Linux
> Reporter: Corneliu C
> Assignee: Remko Popma
> Fix For: 2.9.1
>
>
> Hi,
> I see java.util.ConcurrentModificationException even with AsyncLogger and I
> don't know if it's something I can configure to get rid of these exceptions.
> The application uses Apache Camel framework and there is a mixture of Async
> Appender and Async Logger defined.
> I don't see many of these but they happen from time to time; they are printed
> in the Console appender.
> * Stacktrace:
> {code}
> 2017-07-19 11:53:56,024 Log4j2-TF-11-AsyncLoggerConfig-4 ERROR An exception
> occurred processing Appender ApacheCamel
> java.util.ConcurrentModificationException
> at java.util.LinkedHashMap$LinkedHashIterator.nextNode(Unknown Source)
> at java.util.LinkedHashMap$LinkedEntryIterator.next(Unknown Source)
> at java.util.LinkedHashMap$LinkedEntryIterator.next(Unknown Source)
> at
> org.apache.logging.log4j.message.ParameterFormatter.appendMap(ParameterFormatter.java:569)
> at
> org.apache.logging.log4j.message.ParameterFormatter.appendPotentiallyRecursiveValue(ParameterFormatter.java:505)
> at
> org.apache.logging.log4j.message.ParameterFormatter.recursiveDeepToString(ParameterFormatter.java:432)
> at
> org.apache.logging.log4j.message.ParameterFormatter.formatMessage2(ParameterFormatter.java:189)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.formatTo(ParameterizedMessage.java:225)
> at
> org.apache.logging.log4j.core.pattern.MessagePatternConverter.format(MessagePatternConverter.java:119)
> at
> org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
> at
> org.apache.logging.log4j.core.layout.PatternLayout$PatternSerializer.toSerializable(PatternLayout.java:333)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:232)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:217)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:57)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:177)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:170)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:161)
> at
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:218)
> at
> org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
> 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.async.AsyncLoggerConfig.asyncCallAppenders(AsyncLoggerConfig.java:115)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigDisruptor.java:112)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigDisruptor.java:98)
> at
> com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:129)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> {code}
> * Log4j.xml configuration:
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="TRACE" name="Test" packages=""
> monitorInterval="10" dest="log4j2-console.log" verbose="false">
> <Properties>
> <Property name="instanceName">${hostName}-app</Property>
> </Properties>
> <Appenders>
> ...
> <Appenders>
> <AlertAppender name="Alert" />
> <EventAppender name="Event" />
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="%d{COMPACT}{UTC} %-5p %t
> %C{1}:%l [%X{camel.breadcrumbId}] %m{nolookups}%n%ex{full}" />
> </Console>
> ...
> <RollingRandomAccessFile name="ApacheCamel"
> fileName="${instanceName}-apache-camel.log"
> filePattern="${instanceName}-apache-camel.log.%d{yyMMdd}-%i"
> immediateFlush="false">
> <PatternLayout>
> <Pattern>%d{COMPACT}{UTC} %-5p %t %c{1}
> [%X{camel.breadcrumbId}] %m{nolookups}%n%ex{full}</Pattern>
> </PatternLayout>
> <Policies>
> <TimeBasedTriggeringPolicy interval="1"
> modulate="true" />
> <SizeBasedTriggeringPolicy size="100 MB" />
> </Policies>
> <DefaultRolloverStrategy max="20"/>
> </RollingRandomAccessFile>
> ...
> <Loggers>
> <AsyncLogger name="org.apache.camel" level="TRACE"
> additivity="false"
> includeLocation="false">
> <AppenderRef ref="ApacheCamel" />
> </AsyncLogger>
> ...
> <Root level="INFO" includeLocation="false">
> <AppenderRef ref="Async" />
> </Root>
> </Loggers>
> </Configuration>
> {code}
> As environment parameters these are configured:
> {code}
> -Dlog4j2.disable.jmx=true -Dlog4j2.enable.threadlocals=true
> -Dlog4j2.enable.direct.encoders=true
> -Dlog4j2.garbagefree.threadContextMap=true
> -DAsyncLoggerConfig.RingBufferSize=10240
> {code}
> Following libs are in classpath:
> disruptor-3.3.6.jar
> log4j-api-2.8.2.jar
> log4j-core-2.8.2.jar
> log4j-jul-2.1.jar
> log4j-slf4j-impl-2.8.2.jar
> log4j-web-2.8.2.jar
> slf4j-api-1.7.21.jar
> Thank you
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