SLF4J with Logback: NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

Question

我正在尝试使用 SLF4J 和特别是 Logback 来实现 RollingFile Logger，但我遇到了一个无法解决的异常。这是：

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:293)
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:118)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:232)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
    at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:76)
    at org.springframework.boot.SpringApplicationRunListeners.lambda$starting[=10=](SpringApplicationRunListeners.java:53)
    at java.util.ArrayList.forEach(ArrayList.java:1259)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)
    at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:53)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302)
    at com.upnetix.java.simeonyachev.PlexUserNameApplication.main(PlexUserNameApplication.java:13)
Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    ... 17 more

那是我的 pom.xml :

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.4</version>
        <relativePath/>
    </parent>

    <dependencies>
        <!--SPRING BOOT-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
<!--            <exclusions>-->
<!--                <exclusion>-->
<!--                    <groupId>org.apache.logging.log4j</groupId>-->
<!--                    <artifactId>log4j-to-slf4j</artifactId>-->
<!--                </exclusion>-->
<!--                <exclusion>-->
<!--                    <groupId>org.apache.logging.log4j</groupId>-->
<!--                    <artifactId>log4j-api</artifactId>-->
<!--                </exclusion>-->
<!--                <exclusion>-->
<!--                    <groupId>org.slf4j</groupId>-->
<!--                    <artifactId>jul-to-slf4j</artifactId>-->
<!--                </exclusion>-->
<!--            </exclusions>-->
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.4.RELEASE</version>
<!--            <exclusions>-->
<!--                <exclusion>-->
<!--                    <groupId>org.jboss.logging</groupId>-->
<!--                    <artifactId>jboss-logging</artifactId>-->
<!--                </exclusion>-->
<!--            </exclusions>-->
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.2.4.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- LOGBACK -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>2.0.0-alpha1</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.3.0-alpha5</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.3.0-alpha5</version>
        </dependency>
    </dependencies>

我什至不确定我是否需要排除项，但我已经尝试以两种方式启动我的应用程序，但并没有解决问题。

那是我的 logback.xml:

<configuration>
<property name="LOGS" value="./logs"/>

<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${LOGS}/logFile.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
        <fileNamePattern>${LOGS}/logFile%i.log</fileNamePattern>
        <minIndex>1</minIndex>
        <maxIndex>20</maxIndex>
    </rollingPolicy>
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
        <maxFileSize>10MB</maxFileSize>
    </triggeringPolicy>
    <encoder>
        <pattern>%date %-5level --- [%thread] - %-50logger{40} : %message %ex{short} %n</pattern>
    </encoder>
</appender>

<logger name="com.java.simeon" level="INFO">
    <appender-ref ref="FILE"/>
</logger>

<root level="INFO">
    <appender-ref ref="FILE" />
</root>

我对该主题进行了彻底的研究，发现自 slf4j-api.1.8.x 及以后版本以来，StaticLoggerBinder 未被使用。根据官方 slf4j 站点 (here and here)，使用最新版本的 slf4j-api(2.x.x) 和 logback-classic(1.3.x) 应该可以完成工作（通过使用新的 ServiceLoader 机制并消除对 StaticLoggerBinder 的需求）。

我试过使用旧版本的 slf4j-api 和 logback-classic，但没有成功。

问题是为什么我的程序需要 StaticLoggerBinder 并在我使用最新的 slf4j-api 和不应该关心的 logback-classic 版本时抛出异常它?

如有任何解决问题的建议，我们将不胜感激！

Answer 1

因为您使用的是 spring-boot-starter-parent 的 2.4.4 版。 spring 引导使用StaticLoggerBinder 获取日志工厂。 StaticLoggerBinder 已在版本 1.3.x 的 logback-classic 中删除。这里有两种方法可以解决这个问题： 1.use 版本的 slf4j-api(2.x.x) 和 logback-classic(1.3.x) 没有 spring 引导。 2.use spring 引导的默认 logback 依赖项。

    <dependencies>
        <!-- omit spring boot -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>2.0.0-alpha1</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.3.0-alpha5</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.3.0-alpha5</version>
        </dependency>
    </dependencies>

SLF4J with Logback: NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

SLF4J with Logback: NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

java

noclassdeffounderror

logback

slf4j

spring-logback