Question

Spring boot 1.5.8默认提供logback-1.1.11版本。我正在尝试将Logback版本从1.1.11升级到1.3.0-alpha4，并在pom中添加了以下两个属性。

<slf4j.version>1.8.0-beta4</slf4j.version>
<logback.version>1.3.0-alpha4</logback.version>

当我尝试运行该应用程序时，出现以下异常。

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:273)
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:98)
    at org.springframework.boot.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:230)
    at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:209)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
    at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)
    at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
    at com.anthem.acmp.service.UMIDALServiceApplication.main(UMIDALServiceApplication.java:25)
Caused by: java.lang.ClassNotFoundException: org.slf4j.impl.StaticLoggerBinder
    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)
    ... 14 more

我发现logback-classic-1.1.11.jar包含一个包org.slf4j.impl，该包的类为StaticLoggerBinder，在logback-classic-1.3.0-alpha4中不可用，并导致此问题。

Answer 1

Logback 1.3和SLF4J 1.8分别与它们的1.2和1.7版本相比具有重大的API更改。在撰写本文时，Spring Boot与新API不兼容。有issue正在跟踪对新版本的支持。在项目稳定并且不再处于alpha或beta状态之前，不会解决该问题。

Answer 2

当我将 StaticLoggerBinder from version 1.2 复制到我的项目中时，我能够使用 logback 1.3.0-alpha4。（在新包 item 中创建一个新的 <form> 并粘贴整个文件。）

在Spring Boot 1.5.8应用程序中将Logback从1.1.11升级到1.3.0-alpha4

2 个答案: