[logback-dev] [JIRA] (LOGBACK-397) ConcurrentModificationException when LoggerContext.reset

[Ross Sargant (JIRA)]

Ross Sargant commented on LOGBACK-397 ConcurrentModificationException when LoggerContext.reset I dug into this issue myself . It doesn't seem that context.reset() is completely threadsafe If other threads in the system are creating loggers at the time reset() is called, this is exception may occur. The test code below reproduces this problem in Logback 1.0.13 package com.tvrc.test; import java.util.ArrayList; import java.util.List; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import ch.qos.logback.classic.LoggerContext; public class TestReset { public static void main(String[] args) { // TODO Auto-generated method stub Logger foo=LoggerFactory.getLogger("Test"); foo.info("Just checking that logging is up"); Thread logCreator=new Thread(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub try{ List<Logger> loggers=new ArrayList<Logger>(); int counter=0; while(true){ Logger test=LoggerFactory.getLogger("logger"+counter++); loggers.add(test); } }catch(Throwable t){ t.printStackTrace(); } } },"logCreator"); logCreator.start(); LoggerContext context=(LoggerContext) LoggerFactory.getILoggerFactory(); try{ while (true){ context.reset(); } }catch(Throwable t){ t.printStackTrace(); } } }

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