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https://issues.apache.org/jira/browse/LOG4J2-3295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466927#comment-17466927
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Ralph Goers commented on LOG4J2-3295:
-------------------------------------
It would probably be better for me to ask what the requirement actually is.
Log4j 1 & 2 are very different as I am sure you have noticed. There may be a
better way to do what you require than what was happening in Log4j 1.
For example, it isn't clear to me why you would switch from a FileAppender to a
RollingFileAppender since the RollingFileAppender is just an extension of a
FileAppender and handles running for long periods of time better. But you
haven't configured any DeleteActions on your RollingFileAppender so you have
the potential to run out of disk space. Log4j 2 can handle that for you.
> Reconfiguration failure with an error
> -------------------------------------
>
> Key: LOG4J2-3295
> URL: https://issues.apache.org/jira/browse/LOG4J2-3295
> Project: Log4j 2
> Issue Type: Bug
> Components: Configuration, Configurators
> Affects Versions: 2.17.0
> Reporter: Mike Li
> Priority: Blocker
>
> Steps to recreate:
> # start with log4j2.xml with following content:
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="DEBUG" monitorInterval="30">
>
> <Appenders>
> <File name="FILE" fileName="c:\temp\product.log">
> <PatternLayout>
> <Pattern>ProductName:%-10p %d\{yyyy-MM-dd HH:mm:ss.SSS}
> {GMT} context:%x [%t] - %-50m - %M(%F:%L)%n</Pattern>
> </PatternLayout>
>
> </File>
> </Appenders>
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="FILE"/>
> </Root>
> </Loggers>
> </Configuration>
>
> 2. After the application is started and running, edit the log4j2.xml file
> with the following content, notice that the fileName in the WRAP appender is
> the same as that in the original FILE appender.
>
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="DEBUG" monitorInterval="30" >
> <Appenders>
> <Async name="ASYNC" includeLocation="true" bufferSize="4096">
> <AppenderRef ref="WRAP"/>
> </Async>
> <RollingFile name="WRAP" fileName="c:\temp\product.log"
> filePattern="c:\temp\product.log.%i">
> <PatternLayout pattern="ProductName:%-7p %d\{yyyy-MM-dd
> HH:mm:ss.SSS}{GMT}
> context:%x [%t] - %-50m - %M(%F:%L)%n"/>
> <Policies>
> <SizeBasedTriggeringPolicy size="1048576"/>
> </Policies>
> <DefaultRolloverStrategy max="4"/>
> </RollingFile>
> </Appenders>
> <Loggers>
> <Root level="DEBUG">
> <AppenderRef ref="ASYNC"/>
> </Root>
> </Loggers>
> </Configuration>
>
> 3. Wait for the log4j to detect the change in 30 seconds to reconfigure. When
> the reconfigure starts, it reports an error. Here is the exception stack:
>
> 2021-12-28 17:42:41,688 Log4j2-TF-1-ConfiguratonFileWatcher-4 ERROR Could not
> create plugin of type class
> org.apache.logging.log4j.core.appender.RollingFileAppender for element
> RollingFile org.apache.logging.log4j.core.config.ConfigurationException:
> Configuration has multiple incompatible Appenders pointing to the same
> resource 'c:\temp\product.log'
> at
> org.apache.logging.log4j.core.appender.AbstractManager.narrow(AbstractManager.java:169)
> at
> org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:217)
> at
> org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:146)
> at
> org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:62)
> 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:1107)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1032)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1024)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:643)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:243)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:289)
> at
> org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:626)
> at
> org.apache.logging.log4j.core.LoggerContext.onChange(LoggerContext.java:762)
> at
> org.apache.logging.log4j.core.util.AbstractWatcher$ReconfigurationRunnable.run(AbstractWatcher.java:93)
> at java.base/java.lang.Thread.run(Thread.java:831)
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