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  1. ,
    via javacodegeeks.com by Unknown author

    Causes : The Collection is internally modified, while a thread is iterating over it. OR after the creation of an iterator, the Collection is internally modified by any method other than the iterator’s own methods for removal and addition.

  2. ,
    via oracle.com by Unknown author

    In order to avoid more than one threads accessing or modifying the same object, you can synchronize them over the object, in order to allow only one thread to manipulate it over time.

java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)	at java.util.ArrayList$Itr.next(ArrayList.java:831)	at ch.qos.logback.core.BasicStatusManager.fireStatusAddEvent(BasicStatusManager.java:86)	at ch.qos.logback.core.BasicStatusManager.add(BasicStatusManager.java:59)	at ch.qos.logback.core.recovery.ResilientOutputStreamBase.addStatus(ResilientOutputStreamBase.java:157)	at ch.qos.logback.core.recovery.ResilientOutputStreamBase.addStatusIfCountNotOverLimit(ResilientOutputStreamBase.java:138)	at ch.qos.logback.core.recovery.ResilientOutputStreamBase.postIOFailure(ResilientOutputStreamBase.java:101)	at ch.qos.logback.core.recovery.ResilientOutputStreamBase.flush(ResilientOutputStreamBase.java:82)	at ch.qos.logback.core.encoder.LayoutWrappingEncoder.doEncode(LayoutWrappingEncoder.java:137)	at ch.qos.logback.core.OutputStreamAppender.writeOut(OutputStreamAppender.java:194)	at ch.qos.logback.core.FileAppender.writeOut(FileAppender.java:209)	at ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:219)	at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(RollingFileAppender.java:182)	at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:103)	at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)	at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)	at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:273)	at ch.qos.logback.classic.Logger.callAppenders(Logger.java:260)	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:442)	at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:396)	at ch.qos.logback.classic.Logger.error(Logger.java:559)