java是由:org引起的。阿帕奇。登录中。log4j。LoggingException:log4jslf4jimpl不能与log4jtoslf4j一起出现
在我的Spring boot 2项目中:
在build.gradle
中:
dependencies {
implementation 'com.google.code.gson:gson:2.7'
implementation 'com.h2database:h2'
implementation 'javax.servlet:jstl:1.2'
implementation 'org.springframework.boot:spring-boot-devtools'
implementation('org.springframework.boot:spring-boot-starter') {
exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
}
implementation 'org.springframework.boot:spring-boot-starter-actuator'
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-log4j2'
implementation 'org.springframework.boot:spring-boot-starter-jdbc'
implementation 'org.springframework.boot:spring-boot-starter-security'
implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
implementation "org.springframework.boot:spring-boot-starter-web"
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
testImplementation 'org.junit.jupiter:junit-jupiter:5.5.2'
}
在src/resources/log4j2.xml
中:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true" xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="Console"
class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<!-- l, L, M - is extremely slow. It's use should be avoided unless execution
speed is not an issue. -->
<param name="ConversionPattern"
value="%p: %d{dd.MM.yyyy HH:mm:ss.SSS} %l %n %m%n"/>
</layout>
</appender>
<appender name="File"
class="org.apache.log4j.DailyRollingFileAppender">
<param name="Encoding" value="UTF-8"/>
<param name="File" value="logs/trace.log"/>
<param name="Append" value="true"/>
<layout class="org.apache.log4j.PatternLayout">
<!-- l, L, M - is extremely slow. It's use should be avoided unless execution
speed is not an issue. -->
<param name="ConversionPattern"
value="%p: %d{dd.MM.yyyy HH:mm:ss.SSS} %l %n %m%n"/>
</layout>
</appender>
<!-- Application Loggers -->
<logger name="com.journaldev.spring">
<level value="info"/>
</logger>
<!-- 3rdparty Loggers -->
<logger name="org.springframework.core">
<level value="info"/>
</logger>
<logger name="org.hibernate">
<level value="info"/>
</logger>
<logger name="org.springframework.beans">
<level value="info"/>
</logger>
<logger name="org.springframework.context">
<level value="info"/>
</logger>
<logger name="org.springframework.web">
<level value="info"/>
</logger>
<!-- The root category is used for all loggers unless a more specific logger
matches. If none of the loggers are assigned a level, then all loggers inherit
the level of the root logger which is set to DEBUG by default -->
<root>
<level value="ALL"/>
<appender-ref ref="Console"/>
<!-- <appender-ref ref="File" /> -->
</root>
</log4j:configuration>
在我的控制器中:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class CategoryController {
private CategoryRepository categoryRepository;
private static Logger logger = LoggerFactory.getLogger(CategoryController.class);
@GetMapping("/categories")
public String getCategories(Model model) {
logger.debug("getCategories>>>>>>>>>>>>>>>>");
model.addAttribute("categoryList", this.categoryRepository.findAll());
return "categories/category_list";
}
}
但当我开始这个项目时,我发现了一个错误:
Caused by: org.apache.logging.log4j.LoggingException: log4j-slf4j-impl cannot be present with log4j-to-slf4j
# 1 楼答案
根据Spring的documentation(正如Simon所指出的),我们决定将“Spring boot starter logging”模块从所有库中排除,而不仅仅是从“Spring boot starter web”中排除
。。。而不是
我也遇到了同样的问题,用这个解决方案解决了
# 2 楼答案
我从构建中排除了spring引导日志记录。但问题仍在发生。它通过从中删除
org.apache.logging.log4j/log4j-slf4j-impl/2.12.1
得到解决。类路径# 3 楼答案
即使在纠正了类路径之后,我在STS中也遇到了同样的问题,Gradle的“全部刷新”解决了这个问题