org.slf4j.helpers.NOPLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext

Question

I get the following error when i use logback in maven (m2e).Environment: JBOSS 7.1.1,maven,eclipse. But it work fine if i just run individually as main class. I couldn't figure out why i am getting this error, can anyone help me troubleshooting this issue and find a solution for it.

Error

17:24:23,675 ERROR [stderr] java.lang.ClassCastException: org.slf4j.helpers.NOPLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext 

17:24:23,681 ERROR [stderr] at com.zreflect.emyed.whiteboard.pubsub.EventLoggerAsync.logStart(EventLoggerAsync.java:116) 

17:24:23,683 ERROR [stderr] at com.zreflect.emyed.whiteboard.pubsub.EventLoggerAsync.onDisconnect(EventLoggerAsync.java:62) 

17:24:23,684 ERROR [stderr] at org.atmosphere.cpr.AtmosphereResourceImpl.onDisconnect(AtmosphereResourceImpl.java:817) 

17:24:23,686 ERROR [stderr] at org.atmosphere.cpr.AtmosphereResourceImpl.notifyListeners(AtmosphereResourceImpl.java:761) 

17:24:23,688 ERROR [stderr] at org.atmosphere.cpr.AtmosphereResourceImpl.notifyListeners(AtmosphereResourceImpl.java:742) 

17:24:23,690 ERROR [stderr] at org.atmosphere.cpr.AsynchronousProcessor.cancelled(AsynchronousProcessor.java:601) 

17:24:23,691 ERROR [stderr] at org.atmosphere.container.BlockingIOCometSupport.cancelled(BlockingIOCometSupport.java:172) 

17:24:23,693 ERROR [stderr] at org.atmosphere.cpr.AsynchronousProcessor$1.run(AsynchronousProcessor.java:119) 

17:24:23,694 ERROR [stderr] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) 

17:24:23,696 ERROR [stderr] at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317) 

17:24:23,698 ERROR [stderr] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150) 

17:24:23,699 ERROR [stderr] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98) 

17:24:23,703 ERROR [stderr] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180) 

17:24:23,707 ERROR [stderr] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204) 

17:24:23,715 ERROR [stderr] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 

17:24:23,716 ERROR [stderr] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 

17:24:23,718 ERROR [stderr] at java.lang.Thread.run(Thread.java:662)

Clayborn

Where does JBoss AS 7 come in here too? – Virgulate

Answer 1

The error indicates that com.zreflect.emyed.whiteboard.pubsub.EventLoggerAsync class is expecting a ch.qos.logback.classic.LoggerContext, instead it obtains a org.slf4j.helpers.NOPLoggerFactory. This usually occurs when some code tries to cast the return value of org.slf4j.LoggerFactory.getILoggerFactory and slf4j is bound to the NOP implementation because no slf4j binding was available on the class path. This is usually accompanied by an error message.

Lode

I have the following files in the WEB-INF/lib. But still get the error. slf4j-api-1.7.3.jar,logback-classic-1.0.10.jar,logback-core-1.0.10.jar – Clayborn

Where is com.zreflect.emyed.whiteboard.pubsub.EventLoggerAsync located? – Lode

it is located in WEB-INF/classes. – Clayborn

I've a similar problem when I run 'sbt test', but if I run 'sbt testOnly TestX' everything is ok. How can I try to solve/understand this error? @Lode – Sexy

Answer 2

For info, if it can help, I had the same issue:

java.lang.ClassCastException: class org.slf4j.helpers.NOPLoggerFactory cannot be cast to class ch.qos.logback.classic.LoggerContext

with JBoss Wildfly 7.4 when using SLF4J 2.0.3 (logback 1.3.4) and this was due to https://jira.qos.ch/browse/SLF4J-548 and the wrong ClassLoader in use. Updating to SLF4J 2.0.4 solves this NOPLogger issue

Graze