log4j2错误未识别格式说明符[t]

I have a log4j2 configuration file for a web app running on Tomcat 8 that looks like this

对于运行在Tomcat 8上的web应用程序，我有一个log4j2配置文件。

<?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorInterval="30" status="trace" strict="true">
        <Properties>
                <Property name="logdir">/path/to/log/dir</Property>
                <Property name="filename">somelogfile.log</Property>
        </Properties>
        <Loggers>
                <Logger name="some.package.name" level="debug" additivity="false">
                        <AppenderRef ref="RollingFile"/>
                </Logger>
        </Loggers>
        <Appenders>
                <RollingFile name="RollingFile" fileName="${logdir}/${filename}" filePattern="${logdir}/${filename}.%d{yyyyMMdd}.gz">
                        <PatternLayout>
                                <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
                        </PatternLayout>
                        <Policies>
                                <TimeBasedTriggeringPolicy interval="6" modulate="true"/>
                        </Policies>
                </RollingFile>
        </Appenders>
</Configuration>

I see that my web app writes to the log file, but the %t pattern I have for thread name doesn't seem to resolve, so I get log statements like this

我看到我的web应用程序写到日志文件，但是我对线程名的%t模式似乎并没有解决，因此我得到了这样的日志语句。

2017-06-10 20:34:51,696 DEBUG s.p.n.SomeServlet [%t] some log message

Notice I get %t instead of the thread name

注意，我得到的是%t而不是线程名。

So to troubleshoot this I started Tomcat using the option

为了解决这个问题，我使用这个选项启动了Tomcat。

-Dorg.apache.logging.log4j.simplelog.StatusLogger.level=TRACE

and I see the following messages print in catalina.out when the webapp is deploying and log4j2 is initializing.

我在卡特琳娜看到了下面的信息。当webapp部署时，log4j2正在初始化。

ERROR StatusLogger Unrecognized format specifier [thread]
ERROR StatusLogger Unrecognized conversion specifier [thread] starting at position 25 in conversion pattern
2017-06-10 19:51:14,277 localhost-startStop-1 DEBUG PluginManager 'Converter' found 41 plugins
2017-06-10 19:51:14,609 localhost-startStop-1 ERROR Unrecognized format specifier [t]
2017-06-10 19:51:14,614 localhost-startStop-1 ERROR Unrecognized conversion specifier [t] starting at position 6 in conversion pattern.

my web app has the following jar files among others

我的web应用程序有以下jar文件。

WEB-INF/lib/log4j-api-2.8.2.jar
WEB-INF/lib/log4j-core-2.8.2.jar
WEB-INF/lib/log4j-web-2.8.2.jar

Not sure what is causing %t to print instead of the actual thread name.

不确定是什么导致%t打印而不是实际的线程名称。

。

2 个解决方案

#1

The only time I've seen something similar was when the classpath contained multiple versions of Log4j2. I didn't investigate to find the root cause though.

我唯一一次看到类似的情况是当类路径包含Log4j2的多个版本时。但我并没有调查找出根本原因。

#2

I too experienced this when I had multiple versions of log4j2 running. Check if any of your dependencies pull in duplicate jars..good luck! Can be a nightmare with classloaders!

当我有多个版本的log4j2运行时，我也经历过这种情况。检查是否有任何依赖项拉入重复的jar。好运！类加载器可能是一场噩梦!

#1