log4j2错误：通过Gradle生成运行jar - log4j：WARN没有找到记录器的appender

问题描述

注意：已编辑（文件名/包名更改）

  $>> java -jar build \lib\somePackageName.jar 
 log4j：WARN记录器（xxx.xxx.xxxx.xxxxx）找不到appender。 
 log4j：WARN请正确初始化log4j系统。 
 log4j：WARN请参阅http://logging.apache.org/log4j/1.2/faq.html#noconfig了解更多信息。 
  

已验证的jar包含log4j2.xml：

  $>> jar tf build \libs\somePackageName.jar | ack -ilog4j2
 META-INF / org / apache / logging / log4j / core / config / plugins / Log4j2Plugins.dat 
 META-INF / org / apache / logging / log4j / core / config /plugins/Log4j2Plugins.dat 
 log4j2.xml 
  

使用依赖性构建Jar的Gradle任务：

  sourceSets {
 main {
资源{
 srcDirs = ['src / resources' ] 
} 
} 
} 
 
任务someFatJar（类型：Jar）{
 manifest {
 attributes（
'Implementation -Title'：'xxxxx-xxxxxxxx'，
'Implementation-Version'：0.x，
'Main-Class'：'xxx.xxxxx.xxxxx.xxxxxxxxxxxx'
）
 
 baseName ='someJarName'
 from {configurations.compile.collect {it.isDirectory（）？它：zipTree（it）}} 
 with jar 
} 
  

项目树：
src\main\java\someJavaFile.java
src\resources\log4j2.xml

（以防万一，我试着移动主目录下的resources目录）

帮助！

解决方案

使用slf4j + log4j2依赖关系是个问题！替换如下的依赖关系（不要使用slf4j-log4j-impl），使用log4j2（log4j-slf4j-impl）中的一次：

  dependencies {
 compile'org.slf4j：slf4j-api：1.7.25'
 compile'org.apache.logging.log4j：log4j-api：2.8.2'
编译'org.apache.logging.log4j：log4j-core：2.8.2'
 compile'org.apache.logging.log4j：log4j-slf4j-impl：2.8.2'
} 
  

Note: edited (filenames/packagenames changed)

$>> java -jar build\lib\somePackageName.jar
log4j:WARN No appenders could be found for logger (xxx.xxx.xxxx.xxxxx).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

validated jar has log4j2.xml:

$>> jar tf build\libs\somePackageName.jar  | ack -i "log4j2"
META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat
META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat
log4j2.xml

Gradle task to build Jar with dependencies:

sourceSets {
    main {
        resources {
            srcDirs = ['src/resources']
        }
    }
}

task someFatJar(type: Jar) {
    manifest {
        attributes (
            'Implementation-Title': 'xxxxx-xxxxxxxx',
            'Implementation-Version': 0.x,
            'Main-Class': 'xxx.xxxxx.xxxxx.xxxxxxxxxxxx'
        )
    }
    baseName = 'someJarName'
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}

Project Tree:src\main\java\someJavaFile.javasrc\resources\log4j2.xml

(just in case, i tried moving "resources" directory under main)

Help!

解决方案

Solution:using slf4j + log4j2 dependencies was the issue! replaced the dependencies as below (do not use slf4j-log4j-impl), use the once available from log4j2 (log4j-slf4j-impl):

dependencies {
    compile 'org.slf4j:slf4j-api:1.7.25'
    compile 'org.apache.logging.log4j:log4j-api:2.8.2'
    compile 'org.apache.logging.log4j:log4j-core:2.8.2'
    compile 'org.apache.logging.log4j:log4j-slf4j-impl:2.8.2'
}

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