我有应用程序，当我从 maven log4j2 运行时它正在工作:

mvn exec:java -Dexec.args=...

但是当我将 jar 作为独立应用程序运行时，它会显示错误:

java -jar

日志:

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.
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
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.

我不明白这个错误。它表明找不到log4j2配置文件，但也提示可能在配置文件中的某些格式

我的配置是:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="off">
    <Appenders>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d [%t] %-5p - %-26.26c{1} - %m\n" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="console" />
        </Root>

        <Logger name="my.package" level="DEBUG" /> 

    </Loggers>
</Configuration>

它位于jar文件的根目录中。

更新

jar 由 maven shade 插件创建:

        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>

所以它包含所有必要的库(大约 23 MB)，当我运行这个 jar 时，我只需要指定参数

最佳答案

好的，我找到了 issue关于这个问题。

简而言之，当使用 maven shade 插件将应用程序类打包到 uber jar 中时，就会出现问题。 虽然对于 log4j2 版本 2.8.1 的修复仍在等待中，但建议的解决方法是使用额外的阴影配置设置更新 maven pom.xml插件如下:

    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

        . . . . .

        <build>
            . . . . . 
            <plugins>
                . . . . . 
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-shade-plugin</artifactId>
                    <version>2.4.1</version>
                    <configuration>
                        <filters>
                            <filter>
                                <artifact>*:*</artifact>
                                <excludes>
                                    <exclude>META-INF/*.SF</exclude>
                                    <exclude>META-INF/*.DSA</exclude>
                                    <exclude>META-INF/*.RSA</exclude>
                                </excludes>
                            </filter>
                        </filters>
                        <transformers>
                            <transformer
                                    implementation="com.github.edwgiz.mavenShadePlugin.log4j2CacheTransformer.PluginsCacheFileTransformer"/>
                        </transformers>
                    </configuration>
                    <executions>
                        <execution>
                            <phase>package</phase>
                            <goals>
                                <goal>shade</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>com.github.edwgiz</groupId>
                            <artifactId>maven-shade-plugin.log4j2-cachefile-transformer</artifactId>
                            <version>2.1</version>
                        </dependency>
                    </dependencies>
                </plugin>
                . . . . . 
            </plugins>
        . . . . . 
        </build>
        . . . . . 
        <pluginRepositories>
            <pluginRepository>
                <id>oss.sonatype.org</id>
                <name>OSS Sonatype Staging</name>
                <url>https://oss.sonatype.org/content/groups/staging</url>
            </pluginRepository>
        </pluginRepositories>      
        . . . . . 
    </project>

关于java - 运行由 shade 插件构建的独立应用程序时找不到 Log4j2 配置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34945438/