Remko Popma created LOG4J2-1908:
-----------------------------------
Summary: Cryptic error message when misconfigured
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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