无法创建类org.apache.logging.log4j.core.impl.Log4jContextFactory

Question

我正在为项目使用spring启动应用程序,并在使用jar运行项目时收到以下错误java -jar build/libs/com.user.admin.rest.services.jar.但它不是一个拦截器,我能够访问api,并且记录器按预期正常工作.我只是想解决这个错误.

ERROR StatusLogger Unable to create class org.apache.logging.log4j.core.impl.Log4jContextFactory specified in jar:file:/Users/Samuel/UserMgmt/com.user.admin.rest.services/build/libs/com.user.admin.rest.services.jar!/META-INF/log4j-provider.properties
 java.lang.ClassNotFoundException: org.apache.logging.log4j.core.impl.Log4jContextFactory
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.apache.logging.log4j.spi.Provider.loadLoggerContextFactory(Provider.java:96)
    at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:91)
    at com.user.admin.rest.services.api.UserServiceResource.<clinit>(UserServiceResource.java:32)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
    at com.user.admin.rest.services.api.Application.main(Application.java:27)
    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.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)

我在build.gradle文件中为logger添加了以下行.

compile 'org.apache.logging.log4j:log4j-api:2.8.2' compile 'org.apache.logging.log4j:log4j-core:2.8.2'

我的log4j2.xml文件如下所示

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xml>
<Configuration status="ERROR" name="example-config">
    <Properties>
        <Property name="PATTERN">%-5level %d [%t] %c:%M(%L): %m%n</Property>
    </Properties>
    <Appenders>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="${PATTERN}" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="TRACE">
            <AppenderRef ref="STDOUT" />
        </Root>
    </Loggers>
</Configuration>

Answer 1

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一般来说，您永远不需要切换日志记录实现；Logback 应该很适合你。但是，如果您决定使用 Log4j 或 Log4j2，则需要更改依赖项以包含您要使用的日志记录实现的适当启动程序并排除 Logback。
\n Spring Boot 的实际应用

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在 Gradle 中将 Logback 替换为 Log4j2

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1. 排除默认日志记录
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\nconfigurations {\n all*.exclude group:\'org.springframework.boot\',\n module:\'spring-boot-starter-logging\'\n}\n

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2. 添加 Log4j2 日志记录
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\n编译("org.springframework.boot:spring-boot-starter-log4j2")\n

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您可以在此处找到Spring Boot 提供的spring-boot-starter-log4j2依赖版本的详细信息。

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