我的log4j2日志文件总是有每行的双倍输出.我怎么能停止复制呢？

Question

我的log4j2日志文件始终具有每行的双倍输出.我怎么能停止复制呢？

    <?xml version="1.0" encoding="UTF-8"?>
    <Configuration status="WARN">
    <properties>
        <property name="name">CernerPharmacyWebApp</property>
        <property name="pattern">%d %-5p %C{2} (%F:%L) - %m%n</property>
    </properties>
    <Appenders>
        <Console name="CONSOLE" target="SYSTEM_OUT">
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout><pattern>${pattern}</pattern></PatternLayout>
        </Console>
        <RollingFile name="ROLLING_FILE" fileName="..\logs\${name}.log"
                     filePattern="..\logs\${name}-%d{yyyy-MM-dd}-%i.log">
            <PatternLayout><pattern>${pattern}</pattern></PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy/><!-- Rotated everyday -->
                <SizeBasedTriggeringPolicy size="50 MB"/> <!-- Or every 50 MB -->
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="error">
            <!-- <AppenderRef ref="CONSOLE"/> -->
            <AppenderRef ref="ROLLING_FILE"/>
        </Root>
        <!-- Controls packages -->
        <Logger name="com.jarmel.pharmacy.controls.BarCodeOrderServlet" level="trace">
            <!-- <AppenderRef ref="CONSOLE"/> -->
            <AppenderRef ref="ROLLING_FILE"/>
        </Logger>
        <Logger name="com.jarmel.pharmacy.controls.GetCodeValues" level="error">
            <!-- <AppenderRef ref="CONSOLE"/> -->
            <AppenderRef ref="ROLLING_FILE"/>
        </Logger>
        <Logger name="com.jarmel.pharmacy.controls.GetPersonnelServlet" level="error">
            <!-- <AppenderRef ref="CONSOLE"/> -->
            <AppenderRef ref="ROLLING_FILE"/>
        </Logger>
   </Loggers>
   </Configuration>

Answer 1

根记录器和命名记录器都指向同一个appender.每个活动记录器都会向其appender发送一个事件,因此appender将多次接收该事件,每个记录器一次.(根记录器将获取所有事件,命名记录器将仅在代码中使用匹配名称获取Logger发出的事件.)

这称为Additivity.请参阅http://logging.apache.org/log4j/2.x/manual/configuration.html#Additivity

您可以在命名的log​​ger配置中设置additivity ="false".