Log4j2不写入文件

Question

我正在使用Log4j2和yaml配置。记录到控制台的效果很好，每次都会创建一个外部日志文件，但没有任何条目。感谢您的一些提示。

Main方法在的src / main / JAVA /我的/例子/日志/：

public class App {
    private static Logger LOG = LogManager.getLogger(App.class);

    public static void main(String[] args) {
      LOG.entry();
      LOG.info("Start of application");
      System.out.println("Hello World!");
      LOG.info("End of application");
      LOG.exit();
    }
}

log4j2.properties在的src / main / java的 -如果我删除/重命名，log4j的节目的消息，没有配置被发现，所以它使用本文件：

name = PropertiesConfig
property.filename = logs/example.log     

appenders = console, rolling
appender.console.type = Console
appender.console.name = STDOUT
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = %d{dd.MM.yyyy HH:mm:ss,SSS} %-5p %c{1}:%L - %m%n

appender.rolling.type = RollingFile
appender.rolling.name = roll
appender.rolling.fileName = ${filename}
appender.rolling.filePattern = logs/app/%d{MM-dd-yy-HH-mm-ss}-%i.log.gz
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d{dd.MM.yyyy HH:mm:ss,SSS} %-5p %c{1}:%L - %m%n
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 2
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 5

loggers = rolling

logger.rolling.name = org.apache.logging.log4j.core.appender.rolling
logger.rolling.level = all
logger.rolling.additivity = true
logger.rolling.appenderRefs = rolling
logger.rolling.appenderRef.rolling.ref = roll

rootLogger.level = all
rootLogger.appenderRefs = stdout
rootLogger.appenderRef.stdout.ref = STDOUT

我的Pom.xml：

<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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>App</groupId>
  <artifactId>ExampleApp</artifactId>
  <version>0.0.1</version>
  <packaging>jar</packaging>

  <name>ExampleApp</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.5</version>
    </dependency>
  </dependencies>
</project>

如果运行它，则会在控制台中显示以下输出：

21.05.2016 14:17:52,397 TRACE App:13 - entry
21.05.2016 14:17:52,399 INFO  App:14 - Start of application
Hello World!
21.05.2016 14:17:52,399 INFO  App:16 - End of application
21.05.2016 14:17:52,399 TRACE App:17 - exit

创建但为空的文件是 logs/example.log

Answer 1

您可以尝试更改 log4j2.properties 底部的 2 行。希望能帮助到你。

name = PropertiesConfig
property.filename = logs/example.log     

appenders = console, rolling
appender.console.type = Console
appender.console.name = STDOUT
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = %d{dd.MM.yyyy HH:mm:ss,SSS} %-5p %c{1}:%L - %m%n

appender.rolling.type = RollingFile
appender.rolling.name = roll
appender.rolling.fileName = ${filename}
appender.rolling.filePattern = logs/app/%d{MM-dd-yy-HH-mm-ss}-%i.log.gz
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d{dd.MM.yyyy HH:mm:ss,SSS} %-5p %c{1}:%L - %m%n
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 2
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=100MB
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 5

loggers = rolling

logger.rolling.name = org.apache.logging.log4j.core.appender.rolling
logger.rolling.level = all
logger.rolling.additivity = true
logger.rolling.appenderRefs = rolling
logger.rolling.appenderRef.rolling.ref = roll

rootLogger.level = all
rootLogger.appenderRefs = rolling, stdout
rootLogger.appenderRef.rolling.ref = roll
rootLogger.appenderRef.stdout.ref = STDOUT

Answer 2

该文件当然是空的。您为新记录器分配了一个名称org.apache.logging.log4j.core.appender.rolling。您请求的记录器是App（或类似的东西）。它不会记录到您的新记录器org.apache.logging.log4j.core.appender.rolling，而是记录到根记录器，并且根记录器配置为仅记录到 STDOUT。这就是刚刚发生的一切。

要解决此问题，请将新记录器的名称更改为其他名称（很可能是您的包名称）。不要只是复制粘贴用户指南中的所有内容。