Log4j2报错ERROR StatusLogger Unrecognized format specifier
问题
使用maven-shade-plugin或者maven-assembly-plugin插件把项目打成一个可执行JAR包时,如果你引入了log4j2会出现如下问题:
ERROR StatusLogger Unrecognized format specifier [d]
ERROR StatusLogger Unrecognized conversion specifier [d] starting at position 16 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [thread]
ERROR StatusLogger Unrecognized conversion specifier [thread] starting at position 25 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [level]
ERROR StatusLogger Unrecognized conversion specifier [level] starting at position 35 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [logger]
ERROR StatusLogger Unrecognized conversion specifier [logger] starting at position 47 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [msg]
ERROR StatusLogger Unrecognized conversion specifier [msg] starting at position 54 in conversion pattern.
ERROR StatusLogger Unrecognized format specifier [n]
ERROR StatusLogger Unrecognized conversion specifier [n] starting at position 56 in conversion pattern.
解决方法
pom中添加如下配置。
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<finalName>${artifactId}-${env}-${version}</finalName>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>xxx.yyyy.zzz.Main</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.handlers</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.schemas</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.tooling</resource>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ComponentsXmlResourceTransformer"/>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
<transformer implementation="com.github.edwgiz.mavenShadePlugin.log4j2CacheTransformer.PluginsCacheFileTransformer" />
</transformers>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>com.github.edwgiz</groupId>
<artifactId>maven-shade-plugin.log4j2-cachefile-transformer</artifactId>
<version>2.6.1</version>
</dependency>
</dependencies>
</plugin>
原因分析
log4j2 是采用的插件式编程,当log4j2包编译时,或者含有log4j2插件的包编译时,会将需要加载的插件信息放在META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat这个文件中(包括官方logj42的原生插件),然后项目启动的时候,log4j2会在各个jar包的META-INF目录下扫描这个插件信息文件,然后去加载插件。
但是当项目被打成一个jar包时,如果两个不同的jar包中都有Log4j2Plugins.dat 这个文件,就会出现问题,其中一个文件会被另一个覆盖,导致项目启动的时候有一个文件中的插件不能被正常加载,导致报错。
解决这个问题就是当所有jar包被打成一个jar包时,需要对各个jar包中的Log4j2Plugins.dat进行合并,这就是maven-shade-plugin.log4j2-cachefile-transformer这个包所做的事情了。
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