Java slf4j log4j hello world问题
我试图寻找一个解决我的错误的方法,但是,由于类似的问题被问了很多,结果的沼泽没有帮助我找到问题的答案 我基本上是想用log4j在slf4j中创建一个简单的“helloworld”,这样以后我就可以进一步定制它了 我的项目基本上是maven hello world项目,稍作调整: App.java:Java slf4j log4j hello world问题,java,maven,java-8,log4j,slf4j,Java,Maven,Java 8,Log4j,Slf4j,我试图寻找一个解决我的错误的方法,但是,由于类似的问题被问了很多,结果的沼泽没有帮助我找到问题的答案 我基本上是想用log4j在slf4j中创建一个简单的“helloworld”,这样以后我就可以进一步定制它了 我的项目基本上是maven hello world项目,稍作调整: App.java: package xx.xxxx.logging; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class App
package xx.xxxx.logging;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class App {
private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
public static void main(String[] args) {
System.out.println("Hello World!");
LOGGER.info("Hello Logger!");
}
}
log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<Appenders>
<Console name="STDOUT" target="System.out">
<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="ALL">
<AppenderRef ref="STDOUT"/>
</Root>
</Loggers>
</Configuration>
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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>xx.xxxx.logging</groupId>
<artifactId>logging-test</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>logging-test</name>
<properties>
<jdk.version>1.8</jdk.version>
<java.version>1.8</java.version>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>
<sonar.java.source>${java.version}</sonar.java.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<version.sl4j>1.7.21</version.sl4j>
<version.sl4j.log4j>2.0.1</version.sl4j.log4j>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${version.sl4j}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${version.sl4j.log4j}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${version.sl4j.log4j}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${version.sl4j.log4j}</version>
</dependency>
</dependencies>
</project>
4.0.0
xx.xxxx.log
测井试验
罐子
1.0-快照
测井试验
1.8
1.8
${java.version}
${java.version}
${java.version}
UTF-8
1.7.21
2.0.1
org.slf4j
slf4j api
${version.sl4j}
org.apache.logging.log4j
log4japi
${version.sl4j.log4j}
org.apache.logging.log4j
log4j型芯
${version.sl4j.log4j}
org.apache.logging.log4j
log4j-slf4j-impl
${version.sl4j.log4j}
尝试运行App.java会产生以下错误:
2017-12-07 11:14:33,263 ERROR catching java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:133)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:744)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:683)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:675)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:349)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:150)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:364)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:422)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:146)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:75)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:37)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:263)
at org.apache.logging.slf4j.Log4jLoggerFactory$PrivateManager.getContext(Log4jLoggerFactory.java:98)
at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:84)
at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:44)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at xx.xxxx.logging.App.<clinit>(App.java:8)
Caused by: java.lang.IllegalArgumentException: No enum constant org.apache.logging.log4j.core.appender.ConsoleAppender.Target.System.out
at java.lang.Enum.valueOf(Enum.java:238)
at org.apache.logging.log4j.core.appender.ConsoleAppender$Target.valueOf(ConsoleAppender.java:57)
at org.apache.logging.log4j.core.appender.ConsoleAppender.createAppender(ConsoleAppender.java:98)
... 22 more
2017-12-07 11:14:33,268 ERROR Unable to invoke factory method in class class org.apache.logging.log4j.core.appender.ConsoleAppender for element Console.
2017-12-07 11:14:33,269 ERROR Null object returned for Console in Appenders.
2017-12-07 11:14:33,275 ERROR Unable to locate appender STDOUT for logger
Hello World!
2017-12-07 11:14:33263捕获java.lang.reflect.InvocationTargetException时出错
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
位于sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)中
位于java.lang.reflect.Method.invoke(Method.java:498)
位于org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:133)
位于org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:744)
位于org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:683)
位于org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:675)
位于org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:349)
位于org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:150)
位于org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:364)
位于org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:422)
位于org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:146)
位于org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:75)
位于org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:37)
位于org.apache.logging.log4j.LogManager.getContext(LogManager.java:263)
位于org.apache.logging.slf4j.Log4jLoggerFactory$PrivateManager.getContext(Log4jLoggerFactory.java:98)
位于org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:84)
位于org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:44)
位于org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)
位于org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
在xx.xxxx.logging.App.(App.java:8)
原因:java.lang.IllegalArgumentException:No enum constant org.apache.logging.log4j.core.appender.ConsoleAppender.Target.System.out
位于java.lang.Enum.valueOf(Enum.java:238)
位于org.apache.logging.log4j.core.appender.ConsoleAppender$Target.valueOf(ConsoleAppender.java:57)
位于org.apache.logging.log4j.core.appender.ConsoleAppender.createAppender(ConsoleAppender.java:98)
... 还有22个
2017-12-07 11:14:33268错误无法调用元素控制台的类org.apache.logging.log4j.core.appender.ConsoleAppender中的工厂方法。
2017-12-07 11:14:33269 Appenders中为控制台返回了错误Null对象。
2017-12-07 11:14:33275错误无法找到记录器的appender标准输出
你好,世界!
任何关于如何解决此问题的线索都将不胜感激。target=“System.out”
显然是不正确的。它与ConsolePender.Target枚举相关。我假设您希望target=“SYSTEM\u OUT”
符合
或者忽略该属性,因为默认情况下它已经是SYSTEM\u OUT
。target=“SYSTEM.OUT”
显然不正确。它与ConsolePender.Target枚举相关。我假设您希望target=“SYSTEM\u OUT”
符合
或者省略该属性,因为默认情况下它已经是
SYSTEM\u OUT
。根据
%d{yyyy-MM-dd HH:MM:ss}%-5p%c{1}:%L-%m%n
根据以下说明尝试遵循log4j语法
%d{yyyy-MM-dd HH:MM:ss}%-5p%c{1}:%L-%m%n
原因:java.lang.IllegalArgumentException:No enum constant org.apache.logging.log4j.core.appender.consoleApender.Target.System.out
尝试替换为System\u out
谢谢,这正是错误。原因:java.lang.IllegalArgumentException:No enum constant org.apache.logging.log4j.core.appender.ConsoleAppender.Target.System.out
尝试替换为System\u out
谢谢,这正是错误所在。
<?xml version="1.0" encoding="UTF-8"?>
<Configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<Appenders>
<Console name="Console-Appender" target="SYSTEM_OUT">
<PatternLayout>
<pattern>
%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
</pattern>
</PatternLayout>
</Console>
</Appenders>
<Loggers>
<Root level="ALL">
<AppenderRef ref="Console-Appender"/>
</Root>
</Loggers>
</Configuration>