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为什么 Log4j2 没有在 Spring 引导应用程序中登录？

[英]Why is Log4j2 not logging inside Spring Boot Application?

 原文  2019-12-11 16:18:05  3   3    java/ spring-boot/ log4j2/ slf4j

问题描述

I'm trying to use spring boot starter and spring boot starter web.我正在尝试使用 spring 启动器和 spring 启动器 web。 So far I've got what I think is a pretty simple set up.到目前为止，我已经完成了我认为非常简单的设置。 I can see that the application is obviously finding and using the log4j2-spring.xml file so my question is why doesn't anything from the MyRunner class log via log4j2?我可以看到该应用程序显然正在查找并使用log4j2-spring.xml文件，所以我的问题是为什么 MyRunner class 日志中没有任何内容通过 log4j2？ It does execute and the System.out.println() statements are writing to the console but the LOG.error messages are not.它确实执行并且System.out.println()语句正在写入控制台，但 LOG.error 消息不是。 Please help.请帮忙。

pom.xml: pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath />
    </parent>
    <groupId>com.demo</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1</version>
    <name>iim</name>
    <description>Demo</description>

    <properties>
        <java.version>1.8</java.version>
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-core</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

log4j2-spring.xml: log4j2-spring.xml：

<Properties>
    <Property name="LOG_PATTERN">
        %d{yyyy-MM-dd HH:mm:ss,SSS} [%t] %-5p [%F:%L] %m%n
    </Property>
</Properties>

<Appenders>
    <Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
        <PatternLayout pattern="${LOG_PATTERN}"/>
    </Console>
</Appenders>

<Loggers>

    <logger name="org.springframework" level="WARN" />      
    <logger name="org.apache.ibatis.logging.jdbc.BaseJdbcLogger" level="ERROR" />
    <logger name="java.sql" level="ERROR" />
    <logger name="org.mybatis" level="ERROR" />

    <Root level="INFO">
        <AppenderRef ref="ConsoleAppender" />
    </Root>
</Loggers>

Application.java:应用。java：

import java.util.stream.Stream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;

@SpringBootApplication
@ComponentScan("com.demo")
public class Application {
    private static final Logger LOG = LoggerFactory.getLogger(Application.class);

    public static void main(String[] args) {
        LOG.warn("********** Starting the application");
        SpringApplication.run(Application.class, args);
    }

    @Component
    public class MyRunner implements CommandLineRunner {
        @Override
        public void run(String... args) throws Exception {
            System.out.println(String.format("%s!!!", "HELLO WORLD"));
            LOG.error(String.format("%s!!!", "HELLO WORLD"));

            Stream.of("John Travolta", "Julia Childs", "Jennifer Anniston", "Helen Hunt", "Rachel Green").forEach(n -> {
                System.out.println(n);
                LOG.error(n);
            });

        }
    }
}

Console Output:控制台 Output：

2019-12-11 10:08:12,294 [restartedMain] INFO  [DirectJDKLog.java:173] Initializing ProtocolHandler ["http-nio-8080"]
2019-12-11 10:08:12,296 [restartedMain] INFO  [DirectJDKLog.java:173] Starting service [Tomcat]
2019-12-11 10:08:12,297 [restartedMain] INFO  [DirectJDKLog.java:173] Starting Servlet engine: [Apache Tomcat/9.0.27]
2019-12-11 10:08:12,377 [restartedMain] INFO  [DirectJDKLog.java:173] Initializing Spring embedded WebApplicationContext
2019-12-11 10:08:12,818 [restartedMain] INFO  [HikariDataSource.java:110] HikariPool-1 - Starting...
2019-12-11 10:08:12,968 [restartedMain] INFO  [HikariDataSource.java:123] HikariPool-1 - Start completed.
2019-12-11 10:08:13,407 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT COUNT(*) FROM db_example.DATABASECHANGELOGLOCK
2019-12-11 10:08:13,413 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT COUNT(*) FROM db_example.DATABASECHANGELOGLOCK
2019-12-11 10:08:13,415 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT `LOCKED` FROM db_example.DATABASECHANGELOGLOCK WHERE ID=1
2019-12-11 10:08:13,428 [restartedMain] INFO  [Slf4jLogger.java:42] Successfully acquired change log lock
2019-12-11 10:08:13,967 [restartedMain] INFO  [Slf4jLogger.java:42] Reading resource: com/demo/db/liquibase/tables/user.sql
2019-12-11 10:08:14,014 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT MD5SUM FROM db_example.DATABASECHANGELOG WHERE MD5SUM IS NOT NULL LIMIT 1
2019-12-11 10:08:14,015 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT COUNT(*) FROM db_example.DATABASECHANGELOG
2019-12-11 10:08:14,016 [restartedMain] INFO  [Slf4jLogger.java:42] Reading from db_example.DATABASECHANGELOG
2019-12-11 10:08:14,016 [restartedMain] INFO  [Slf4jLogger.java:42] SELECT * FROM db_example.DATABASECHANGELOG ORDER BY DATEEXECUTED ASC, ORDEREXECUTED ASC
2019-12-11 10:08:14,025 [restartedMain] INFO  [Slf4jLogger.java:42] Successfully released change log lock
2019-12-11 10:08:14,087 [restartedMain] INFO  [DirectJDKLog.java:173] Starting ProtocolHandler ["http-nio-8080"]
HELLO WORLD!!!
John Travolta
Julia Childs
Jennifer Anniston
Helen Hunt
Rachel Green

3 个解决方案

解决方案1
 1 已采纳  2019-12-11 17:42:45

I tried your code with few changes to work on my IDE, and it is working perfectly fine, below is the updated code, this code may help you to dig down your issue:我尝试了您的代码，对我的 IDE 进行了一些更改，它运行良好，以下是更新的代码，此代码可以帮助您解决问题：

package com.example.demo;
import java.util.stream.Stream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Component;

@SpringBootApplication
public class Application {
    private static final Logger LOG = LoggerFactory.getLogger(Application.class);

    public static void main(String[] args) {
        LOG.warn("********** Starting the application");
        SpringApplication.run(Application.class, args);
    }

     @Component
    public class MyRunner implements CommandLineRunner {
        @Override
        public void run(String... args) throws Exception {
            System.out.println(String.format("%s!!!", "HELLO WORLD"));
            LOG.error(String.format("%s!!!", "HELLO WORLD"));

            Stream.of("John Travolta", "Julia Childs", "Jennifer Anniston", "Helen Hunt", "Rachel Green").forEach(n -> {
                System.out.println(n);
                LOG.error(n);
            });

        }
    }
}

I have kept below log xml(log4j2-spring.xml) under - src/main/resource我一直保存在日志 xml(log4j2-spring.xml) 下面 - src/main/resource

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
<Properties>
    <Property name="LOG_PATTERN">
        %d{yyyy-MM-dd HH:mm:ss,SSS} [%t] %-5p [%F:%L] %m%n
    </Property>
</Properties>

<Appenders>
    <Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
        <PatternLayout pattern="shree - ${LOG_PATTERN}"/>
    </Console>
</Appenders>

<Loggers>

    <logger name="org.springframework" level="WARN" />      
    <logger name="org.apache.ibatis.logging.jdbc.BaseJdbcLogger" level="ERROR" />
    <logger name="java.sql" level="ERROR" />
    <logger name="org.mybatis" level="ERROR" />

    <Root level="INFO">
        <AppenderRef ref="ConsoleAppender" />
    </Root>
</Loggers>
</Configuration>

Removed mybatis and jdbc dependencies as spring was asking for db configuration.删除了 mybatis 和 jdbc 依赖项，因为 spring 要求进行 db 配置。 Those Jar might be causing the issues in your code(overriding your log configurations):那些 Jar 可能会导致您的代码出现问题（覆盖您的日志配置）：

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

 <properties>
        <java.version>1.8</java.version>
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

       <!--  <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
        </dependency> -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

       <!--  <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency> -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>

        <!-- <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

       <!--  <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-core</artifactId>
        </dependency> -->

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

output: output：

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.1.RELEASE)

shree - 2019-12-11 22:58:03,221 [restartedMain] INFO  [StartupInfoLogger.java:55] Starting Application on LAPTOP-FS2FJ2C3 with PID 6044 (C:\Users\shrir\eclipse-workspace-jee-code\demo\target\classes started by shrir in C:\Users\shrir\eclipse-workspace-jee-code\demo)
shree - 2019-12-11 22:58:03,228 [restartedMain] INFO  [SpringApplication.java:651] No active profile set, falling back to default profiles: default
shree - 2019-12-11 22:58:04,014 [restartedMain] INFO  [DirectJDKLog.java:173] Initializing ProtocolHandler ["http-nio-8080"]
shree - 2019-12-11 22:58:04,014 [restartedMain] INFO  [DirectJDKLog.java:173] Starting service [Tomcat]
shree - 2019-12-11 22:58:04,015 [restartedMain] INFO  [DirectJDKLog.java:173] Starting Servlet engine: [Apache Tomcat/9.0.27]
shree - 2019-12-11 22:58:04,074 [restartedMain] INFO  [DirectJDKLog.java:173] Initializing Spring embedded WebApplicationContext
shree - 2019-12-11 22:58:04,402 [restartedMain] INFO  [DirectJDKLog.java:173] Starting ProtocolHandler ["http-nio-8080"]
shree - 2019-12-11 22:58:04,423 [restartedMain] INFO  [StartupInfoLogger.java:61] Started Application in 1.478 seconds (JVM running for 2.412)
HELLO WORLD!!!
shree - 2019-12-11 22:58:04,424 [restartedMain] ERROR [Application.java:36] HELLO WORLD!!!
John Travolta
shree - 2019-12-11 22:58:04,424 [restartedMain] ERROR [Application.java:40] John Travolta
Julia Childs
shree - 2019-12-11 22:58:04,424 [restartedMain] ERROR [Application.java:40] Julia Childs
Jennifer Anniston
shree - 2019-12-11 22:58:04,425 [restartedMain] ERROR [Application.java:40] Jennifer Anniston
Helen Hunt
shree - 2019-12-11 22:58:04,425 [restartedMain] ERROR [Application.java:40] Helen Hunt
Rachel Green
shree - 2019-12-11 22:58:04,425 [restartedMain] ERROR [Application.java:40] Rachel Green

This might not be your solution, but will help you to find the issue.这可能不是您的解决方案，但会帮助您找到问题所在。

Adding code in Answer section as cant explain in comment section在答案部分添加代码，因为无法在评论部分解释

解决方案2
 0  2019-12-11 18:22:15

Your code is correct except the main method where you have to write log statement after run statement, otherwise everything is correct and it should log.您的代码是正确的，除了您必须在运行语句之后编写日志语句的主要方法，否则一切都是正确的并且应该记录。 FYI boot default log level is set to INFO.仅供参考，引导默认日志级别设置为 INFO。

 public static void main(String[] args) {

    SpringApplication.run(Application.class, args);
    LOG.warn("********** Starting the application");
}

解决方案3
 0  2022-07-02 20:44:05

There is very less probability that you might be having any issue with log4j2.xml or log4j2-spring.xml. log4j2.xml 或 log4j2-spring.xml 出现任何问题的可能性很小。 Most likely problem is in your pom.最有可能的问题出在你的 pom.xml 中。

I would suggest to run mvn:dependeny:tree and exclude spring-boot-starter-logging from all the dependencies in your class path.我建议运行 mvn:dependeny:tree 并从 class 路径中的所有依赖项中排除 spring-boot-starter-logging。

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>

I hope this would help.我希望这会有所帮助。 No need to explicitly give logging config file location in application.properties unless it is outside your project classpath.无需在 application.properties 中明确给出日志配置文件的位置，除非它在您的项目类路径之外。

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