spring - 版本健全性检查 (Spring/SLF4J)

Question

我正在尝试在 Tomcat 上部署 Spring Boot 应用程序。但不知何故，我得到了:

Unexpected problem occured during version sanity check
Reported exception:
java.lang.AbstractMethodError: org.apache.logging.slf4j.SLF4JServiceProvider.getRequestedApiVersion()Ljava/lang/String;
        at org.slf4j.LoggerFactory.versionSanityCheck(LoggerFactory.java:297)
        at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:141)
        at org.slf4j.LoggerFactory.getProvider(LoggerFactory.java:421)
        at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:407)
        at io.micrometer.core.util.internal.logging.Slf4JLoggerFactory.<init>(Slf4JLoggerFactory.java:49)
        at io.micrometer.core.util.internal.logging.Slf4JLoggerFactory.<clinit>(Slf4JLoggerFactory.java:46)
        at io.micrometer.core.util.internal.logging.InternalLoggerFactory.newDefaultFactory(InternalLoggerFactory.java:60)
        at io.micrometer.core.util.internal.logging.InternalLoggerFactory.getDefaultFactory(InternalLoggerFactory.java:76)
        at io.micrometer.core.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:108)
        at io.micrometer.core.util.internal.logging.InternalLoggerFactory.getInstance(InternalLoggerFactory.java:98)
        at io.micrometer.core.instrument.binder.jvm.JvmGcMetrics.<clinit>(JvmGcMetrics.java:61)
        at org.springframework.boot.actuate.autoconfigure.metrics.JvmMetricsAutoConfiguration.jvmGcMetrics(JvmMetricsAutoConfiguration.java:48)
        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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)

我在一个通用类加载器中有几个 SLF4J/Log4J2 jar，用于其他一些 web 应用程序。

喜欢:

log4j-api-2.14.1.jar
log4j-core-2.14.1.jar
log4j-over-slf4j-2.0.0-alpha5.jar
log4j-slf4j18-impl-2.14.1.jar
slf4j-api-2.0.0-alpha5.jar

我以为是 slf4j jar 和 spring WAR 的 jar 冲突。所以我从 Spring 应用程序中排除了所有 sllf4j 项目，认为它会从公共(public)加载器中选择类。但我收到上述错误。该应用程序启动良好，没有任何问题。但不知道如何摆脱这个。我的 spring 应用程序 pom 的最终依赖部分是这样的:

<dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-to-slf4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>jul-to-slf4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>ch.qos.logback</groupId>
                    <artifactId>logback-classic</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</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-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
    
    </dependencies>

Answer 1

您似乎在 log4j-slf4j18-impl 库中发现了一个错字。slf4j-api:2.0.0-alpha5 的 LoggerFactory 尝试从提供者 (source) 获取请求的 api 版本:

String requested = PROVIDER.getRequestedApiVersion();

但似乎实际实现只有一个名为 getRequesteApiVersion 的方法

我鼓励你在 Apache 的 issue tracker 中打开一个问题。对这个。

编辑:我在 Apache 问题跟踪器 (https://issues.apache.org/jira/browse/LOG4J2-3139) 中发现了类似的问题。基于该信息，Slf4J 对 2.0 版本进行了非向后兼容更改(将 getRequesteApiVersion 方法更改为 getRequestedApiVersion)。由于 Slf4J 目前处于 alpha 版本，因此 Apache 只会在 Slf4j 稳定版本发布后修复此问题。

您可以尝试为 Slf4J 指定另一个提供程序或隐式使用旧版本的 Slf4j。