slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析

基本描述

slf4j 是日志的api 门面模式，引入slf4j-api就行，但是打印不出日志的，因为没有具体的实现类。

logback实现包 :

       <dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.6</version></dependency><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-core</artifactId><version>1.2.6</version></dependency>

log4j 实现包 :


<dependency>  <groupId>org.slf4j</groupId>  <artifactId>slf4j-log4j12</artifactId>  <version>1.7.2</version>
</dependency>

slf4j是怎么找到实现类的

通过StaticLoggerBinder 来获取ILoggerFactory
StaticLoggerBinder类是sf4j-api没有的，需要实现类的jar包提供，并且包名是org.slf4j.impl
如果没有实现包，就找不到StaticLoggerBinder类了，就报slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder”
如果有多个实现包，pom依赖谁在前面，就先找到谁的。

相关源码

Logger logger = LoggerFactory.getLogger("aa");

// 获取Logger
public static Logger getLogger(String name) {ILoggerFactory iLoggerFactory = getILoggerFactory();return iLoggerFactory.getLogger(name);}//获取工厂类public static ILoggerFactory getILoggerFactory() {if (INITIALIZATION_STATE == UNINITIALIZED) {synchronized (LoggerFactory.class) {if (INITIALIZATION_STATE == UNINITIALIZED) {INITIALIZATION_STATE = ONGOING_INITIALIZATION;//初始化performInitialization();}}}switch (INITIALIZATION_STATE) {case SUCCESSFUL_INITIALIZATION:return StaticLoggerBinder.getSingleton().getLoggerFactory();case NOP_FALLBACK_INITIALIZATION:return NOP_FALLBACK_FACTORY;case FAILED_INITIALIZATION:throw new IllegalStateException(UNSUCCESSFUL_INIT_MSG);case ONGOING_INITIALIZATION:// support re-entrant behavior.// See also http://jira.qos.ch/browse/SLF4J-97//默认的工厂，实际上是走不到这逻辑return SUBST_FACTORY;}throw new IllegalStateException("Unreachable code");}//平台初始化
private final static void performInitialization() {bind();if (INITIALIZATION_STATE == SUCCESSFUL_INITIALIZATION) {versionSanityCheck();}}//绑定具体的slf4j的实现
private final static void bind() {try {Set<URL> staticLoggerBinderPathSet = null;// skip check under android, see also// http://jira.qos.ch/browse/SLF4J-328if (!isAndroid()) {staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();reportMultipleBindingAmbiguity(staticLoggerBinderPathSet);}// the next line does the binding//StaticLoggerBinder类是sf4j-api没有的，需要实现类的jar包提供，并且包名是org.slf4j.implStaticLoggerBinder.getSingleton();INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;reportActualBinding(staticLoggerBinderPathSet);fixSubstituteLoggers();replayEvents();// release all resources in SUBST_FACTORYSUBST_FACTORY.clear();} catch (NoClassDefFoundError ncde) {String msg = ncde.getMessage();if (messageContainsOrgSlf4jImplStaticLoggerBinder(msg)) {INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;Util.report("Failed to load class \"org.slf4j.impl.StaticLoggerBinder\".");Util.report("Defaulting to no-operation (NOP) logger implementation");Util.report("See " + NO_STATICLOGGERBINDER_URL + " for further details.");} else {failedBinding(ncde);throw ncde;}} catch (java.lang.NoSuchMethodError nsme) {String msg = nsme.getMessage();if (msg != null && msg.contains("org.slf4j.impl.StaticLoggerBinder.getSingleton()")) {INITIALIZATION_STATE = FAILED_INITIALIZATION;Util.report("slf4j-api 1.6.x (or later) is incompatible with this binding.");Util.report("Your binding is version 1.5.5 or earlier.");Util.report("Upgrade your binding to version 1.6.x.");}throw nsme;} catch (Exception e) {failedBinding(e);throw new IllegalStateException("Unexpected initialization failure", e);}}

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析相关推荐

SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". Spring Cloud 启动提示: SLF4J: ...
SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder
以下为自己刚学习java遇到及排错过程日志换成了 slf4j+logback,没看到本地有日志文件生成,调试时发现有错误提示(是在加载druid时出现的): SLF4J: Failed to loa ...
SLF4J:Failed to load class org.slf4j.impl.StaticLoggerBinder
SLF4J:Failed to load class "org.slf4j.impl.StaticLoggerBinder" 解决方案: <dependency>< ...
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder“.解决方法
在IDEA中启动JAVA程序之后,控制台中报以下错误信息 SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder&quo ...
tomcat 启动显示日志级别，以及SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder.错误
把以前的一个老项目通过maven的方式搭了一下,tomcat启动时,打印信息特别多,当时判断日志显示级别应该是debug.但我配置与之前没有任何改变,所以问题应该出在pom.xml上,于是网上查找资料 ...
报错：SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder“.
报错 SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to n ...
slf4j报错:SLF4J:Failed to load class org.slf4j.impl.StaticLoggerBinder.Defaulting to no-operat有效解决办法
运行maven程序时报如下错误: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: D ...
idea springboot启动报SLF4J:Failed to load class “org.slf4j.impl.StaticLoggerBinder
文章目录首先声明一下,我用的 Intellij IDEA 2018.3 版本的,springboot的版本是 2.0.5.RELEASE 版本. 当我喜滋滋的编写完测试代码,点击 Debug 的时候 ...
报错：SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder“. SLF4J: Defaulting to no-operation
报错: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 然后去 http://www.slf4j. ...

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析

基本描述

slf4j是怎么找到实现类的

相关源码

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析相关推荐

最新文章

热门文章

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误 源码解析

基本描述

slf4j是怎么找到实现类的

相关源码

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误 源码解析相关推荐

最新文章

热门文章

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析

slf4j Failed to load class “org.slf4j.impl.StaticLoggerBinder“ 错误源码解析相关推荐