Corneliu C created LOG4J2-1988:
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Summary: 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
Priority: Minor
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}
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