标签:spring-boot java
我最近将Spring Boot应用程序从1.5.10升级到了2.0.3,现在正面临这个问题:当我将logging.level.root = DEBUG添加到application.properties时,出现以下异常:
log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.StandardServletEnvironment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "background-preinit" java.lang.StackOverflowError
at org.slf4j.bridge.SLF4JBridgeHandler.getSLF4JLogger(SLF4JBridgeHandler.java:198)
at org.slf4j.bridge.SLF4JBridgeHandler.publish(SLF4JBridgeHandler.java:293)
at java.util.logging.Logger.log(Logger.java:738)
at java.util.logging.Logger.doLog(Logger.java:765)
at java.util.logging.Logger.logp(Logger.java:931)
at org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:180)
at org.apache.juli.logging.DirectJDKLog.debug(DirectJDKLog.java:103)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1154)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at org.slf4j.bridge.SLF4JBridgeHandler.getSLF4JLogger(SLF4JBridgeHandler.java:198)
at org.slf4j.bridge.SLF4JBridgeHandler.publish(SLF4JBridgeHandler.java:293)
at java.util.logging.Logger.log(Logger.java:738)
at java.util.logging.Logger.doLog(Logger.java:765)
at java.util.logging.Logger.logp(Logger.java:931)
at org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:180)
at org.apache.juli.logging.DirectJDKLog.debug(DirectJDKLog.java:103)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1154)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
at org.slf4j.bridge.SLF4JBridgeHandler.getSLF4JLogger(SLF4JBridgeHandler.java:198)
at org.slf4j.bridge.SLF4JBridgeHandler.publish(SLF4JBridgeHandler.java:293)
...
这只是一小部分,因为这组堆栈跟踪重复了100次以上,从而导致StackOverflowError.
我尝试过的调试步骤:
>如果将日志记录级别更改为其他任何信息(例如INFO),都不会出现异常.
>我在pom.xml中添加了SLF4JBridgeHandler的特定依赖项.
>我确保SLF4JBridgeHandler在我的Web应用程序的类路径中.
是什么导致此问题?
解决方法:
我只引用official slf4j documentation
jul-to-slf4j.jar and slf4j-jdk14.jar cannot be present simultaneously
The presence of
slf4j-jdk14.jar
, that is thejul
binding for
SLF4J
, will forceSLF4J
calls to be delegated tojul
. On the
other hand, the presence ofjul-to-slf4j.jar
, plus the installation
ofSLF4JBridgeHandler
, by invoking “SLF4JBridgeHandler.install()
”
will routejul
records toSLF4J
. Thus, if both jar are present
simultaneously (andSLF4JBridgeHandler
is installed),slf4j
calls
will be delegated tojul
andjul
records will be routed to
SLF4J
, resulting in an endless loop.
您的情况正在发生什么.
尝试执行mvndependency:tree并排除冲突的依赖项.
在我看来,spring-boot擅长管理此类依赖项.因此,通过减少手动添加的依赖项来保持pom.xml的干净非常好.
标签:spring-boot,java 来源: https://codeday.me/bug/20191108/2009788.html
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