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https://issues.apache.org/jira/browse/LOG4J2-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Remko Popma updated LOG4J2-1908:
--------------------------------
Summary: Cryptic error message when misconfigured with File and
RollingRandomAccessFile appenders targeting same file (was: Cryptic error
message when misconfigured)
> Cryptic error message when misconfigured with File and
> RollingRandomAccessFile appenders targeting same file
> ------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-1908
> URL: https://issues.apache.org/jira/browse/LOG4J2-1908
> Project: Log4j 2
> Issue Type: Improvement
> Components: Configurators, Core
> Reporter: Remko Popma
>
> When a configuration contains a FileAppender and a
> RollingRandomAccessFileAppender that target the same file, the below error
> occurs.
> Admittedly the configuration is wrong, but the error message is misleading or
> at least not helpful for users. Without intimate understanding of the Log4j
> internals (how FileManagers work) it is almost impossible to determine that
> the below error is caused by a misconfiguration, what the problem is and how
> to fix it.
> The configuration:
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="WARN">
> <properties>
> <property name="pattern">%d{ISO8601} %r [%t] %-5level %logger{1.} -
> %msg%n</property>
> </properties>
> <Appenders>
> <Console name="CONSOLE" target="SYSTEM_OUT" follow="true">
> <PatternLayout pattern="${pattern}" />
> </Console>
> <File name="FILE" fileName="logs/app.log">
> <PatternLayout pattern="${pattern}" />
> </File>
> <RollingRandomAccessFile name="ROLLING"
> fileName="logs/app.log"
> filePattern="logs/%d{yyyyMMdd}/app-%i.log.gz">
> <PatternLayout pattern="${pattern}" />
> <Policies>
> <OnStartupTriggeringPolicy/>
> <SizeBasedTriggeringPolicy size="1 GB" />
> <TimeBasedTriggeringPolicy/>
> </Policies>
> <DefaultRolloverStrategy/>
> </RollingRandomAccessFile>
> </Appenders>
> <Loggers>
> <Root level="DEBUG">
> <AppenderRef ref="CONSOLE" level="WARN"/>
> <AppenderRef ref="FILE" />
> </Root>
> </Loggers>
> </Configuration>
> {code}
> Gives this error:
> {noformat}
> 2017-05-11 15:52:55,959 main ERROR Unable to inject fields into builder class
> for plugin type class
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender,
> element RollingRandomAccessFile. java.lang.ClassCastException:
> org.apache.logging.log4j.core.appender.FileManager cannot be cast to
> org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager
> at
> org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager.getRollingRandomAccessFileManager(RollingRandomAccessFileManager.java:87)
> at
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender$Builder.build(RollingRandomAccessFileAppender.java:115)
> at
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender$Builder.build(RollingRandomAccessFileAppender.java:52)
> at
> org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:122)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:952)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:892)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:884)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:508)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:232)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:244)
> at
> org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
> at
> org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:617)
> at
> org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:634)
> at
> org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:229)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerContext.start(AsyncLoggerContext.java:76)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:152)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
> at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
> at
> org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:122)
> at
> org.apache.logging.log4j.jul.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:34)
> at
> org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
> at
> org.apache.logging.log4j.jul.LogManager.getLogger(LogManager.java:89)
> at java.util.logging.LogManager.demandLogger(LogManager.java:551)
> at java.util.logging.Logger.demandLogger(Logger.java:455)
> at java.util.logging.Logger.getLogger(Logger.java:502)
> at
> com.lmax.disruptor.FatalExceptionHandler.<clinit>(FatalExceptionHandler.java:27)
> at
> com.lmax.disruptor.dsl.ExceptionHandlerWrapper.<init>(ExceptionHandlerWrapper.java:8)
> at com.lmax.disruptor.dsl.Disruptor.<init>(Disruptor.java:66)
> at com.lmax.disruptor.dsl.Disruptor.<init>(Disruptor.java:105)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerDisruptor.start(AsyncLoggerDisruptor.java:92)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerContext.start(AsyncLoggerContext.java:75)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:152)
> at
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
> at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
> at
> org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:122)
> at
> org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:43)
> at
> org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
> at
> org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
> at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)
> at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
> at com.company.project.Main.main(Main.java:1030)
> {noformat}
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