為什么 Log4j2 沒有在 Spring 引導應用程序中登錄？
[英]Why is Log4j2 not logging inside Spring Boot Application?
問題描述
我正在嘗試使用 spring 啟動器和 spring 啟動器 web。 到目前為止，我已經完成了我認為非常簡單的設置。 我可以看到該應用程序顯然正在查找並使用log4j2-spring.xml文件，所以我的問題是為什么 MyRunner class 日志中沒有任何內容通過 log4j2？ 它確實執行並且System.out.println()語句正在寫入控制台，但 LOG.error 消息不是。 請幫忙。
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：
<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>
應用。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);
});
}
}
}
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 個解決方案
解決方案1
1 已采納 2019-12-11 17:42:45
我嘗試了您的代碼，對我的 IDE 進行了一些更改，它運行良好，以下是更新的代碼，此代碼可以幫助您解決問題：
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);
});
}
}
}
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>
刪除了 mybatis 和 jdbc 依賴項，因為 spring 要求進行 db 配置。 那些 Jar 可能會導致您的代碼出現問題（覆蓋您的日志配置）：
<?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：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: 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
這可能不是您的解決方案，但會幫助您找到問題所在。
在答案部分添加代碼，因為無法在評論部分解釋
解決方案2
0 2019-12-11 18:22:15
您的代碼是正確的，除了您必須在運行語句之后編寫日志語句的主要方法，否則一切都是正確的並且應該記錄。 僅供參考，引導默認日志級別設置為 INFO。
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
LOG.warn("********** Starting the application");
}
解決方案3
0 2022-07-02 20:44:05
log4j2.xml 或 log4j2-spring.xml 出現任何問題的可能性很小。 最有可能的問題出在你的 pom.xml 中。
我建議運行 mvn:dependeny:tree 並從 class 路徑中的所有依賴項中排除 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>
我希望這會有所幫助。 無需在 application.properties 中明確給出日志配置文件的位置，除非它在您的項目類路徑之外。
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