Question

我已将此分离为一个非常简单的测试项目，除了简单的log4j2test配置+用法之外没有任何其他目的。文件目录结构：

.
├── build.sbt
└── src
└── main
    ├── resources
    │   └── log4j2.xml
    └── scala
    └── mycompany
        └── myapp
        └── SimpleMain.scala

Build.sbt：

name := """log4j2test"""

version := "1.0.0-SNAPSHOT"

scalaVersion := "2.12.1"

scalacOptions := Seq("-unchecked", "-deprecation", "-encoding", "utf8")

libraryDependencies ++= {
  Seq(
"org.apache.logging.log4j"         % "log4j-slf4j-impl" % "2.8",
"org.apache.logging.log4j"         % "log4j-api" % "2.8",
"org.apache.logging.log4j"         % "log4j-core" % "2.8",
"com.fasterxml.jackson.dataformat" % "jackson-dataformat-yaml" % "2.8.6"
  )
}

log4j2.xml内容是从官方文档中的示例中复制/粘贴的：https://logging.apache.org/log4j/2.x/manual/configuration.html

SimpleMain.scala：

package mycompany.myapp

import org.slf4j.LoggerFactory

object SimpleMain {
  val logger = LoggerFactory.getLogger(getClass())

  def main(args: Array[String]): Unit = {
println("simple println test")
logger.info("this is a logger.info message")
logger.debug("this is a logger.debug message")
logger.error("this is a logger.error message")

val stream = this.getClass.getClassLoader.getResourceAsStream("log4j2.xml")
if (stream == null) {
  println("failed to open log4j2.xml on classpath")
} else {
  println("successfully opened log4j2.xml on classpath")
  stream.close()
}
  }
}

我用

运行

sbt "run-main mycompany.myapp.SimpleMain"

输出：

[info] Running mycompany.myapp.SimpleMain 
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
simple println test
14:12:14.508 [run-main-0] ERROR mycompany.myapp.SimpleMain$ - this is a logger.error message
successfully opened log4j2.xml on classpath
[success] Total time: 4 s, completed Feb 10, 2017 2:12:14 PM

Answer 1

SimpleMain应用程序的类加载器是否可能与slf4j的类加载器不同？请尝试通过将系统属性org.apache.logging.log4j.simplelog.StatusLogger.level设置为TRAC‌E来调试Log4j2初始化。

Answer 2

log4j2.xml是否放在jar的根目录下？我很惊讶getResourceAsStream正在工作。您将它指定为相对路径，因此应该找到/mycompany/myapp/log4j2.xml。

“找不到log4j2配置文件。”

2 个答案: