小编pha*_*rus的帖子

我正在尝试使用log4j2从使用FileAppender切换到RollingFileAppender(与beta3和beta4 jar一起发生).

我把它配置为:

<RollingFile name="RollingFile" fileName="${logdir}/${filename}" 
    filePattern="${logdir}/app-%d{yyyy-MM-dd-hh-mm-ss}_%i.log" >
    <PatternLayout>
        <pattern>%d %p %C{1.} [%t] %m%n</pattern>
    </PatternLayout>
    <Policies>
        <OnStartupTriggeringPolicy/>
    </Policies>
    <DefaultRolloverStrategy max="20"/>
</RollingFile>  
        ...
<loggers>
          <root level="ERROR">
    <appender-ref ref="RollingFile"/>
    <appender-ref ref="STDOUT"/>
</root>
        ...

在代码中,我试图以这种方式获取记录器:

Logger logger = LogManager.getLogger(this.getClass());

但是当我运行它时我得到了这个异常:

2013-02-01 17:56:54,773 ERROR Unable to invoke method createAppender in class org.apache.logging.log4j.core.appender.RollingFileAppender for element RollingFile java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.logging.log4j.core.config.BaseConfiguration.createPluginObject(BaseConfiguration.java:723)
    at org.apache.logging.log4j.core.config.BaseConfiguration.createConfiguration(BaseConfiguration.java:489)
    at org.apache.logging.log4j.core.config.BaseConfiguration.createConfiguration(BaseConfiguration.java:481)
    at org.apache.logging.log4j.core.config.BaseConfiguration.doConfigure(BaseConfiguration.java:162)
    at org.apache.logging.log4j.core.config.BaseConfiguration.start(BaseConfiguration.java:120)
    at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:271)
    at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:287)
    at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:139) …