java.util.ConcurrentModificationException: This exception has no message.

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via 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.

via 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.

Solutions on the web

via JIRA by Alex, 1 year ago
This exception has no message.
via JIRA by Alex, 1 year ago
This exception has no message.
via GitHub by clucky
, 2 years ago
This exception has no message.
via Stack Overflow by Unknown author, 2 years ago
via Stack Overflow by code4fun
, 1 year ago
at java.util.ArrayList$Itr.checkForComodification(
at java.util.ArrayList$
at ch.qos.logback.core.BasicStatusManager.fireStatusAddEvent(
at ch.qos.logback.core.BasicStatusManager.add(
at ch.qos.logback.core.recovery.ResilientOutputStreamBase.addStatus(
at ch.qos.logback.core.recovery.ResilientOutputStreamBase.addStatusIfCountNotOverLimit(
at ch.qos.logback.core.recovery.ResilientOutputStreamBase.postIOFailure(
at ch.qos.logback.core.recovery.ResilientOutputStreamBase.flush(
at ch.qos.logback.core.encoder.LayoutWrappingEncoder.doEncode(
at ch.qos.logback.core.OutputStreamAppender.writeOut(
at ch.qos.logback.core.FileAppender.writeOut(
at ch.qos.logback.core.OutputStreamAppender.subAppend(
at ch.qos.logback.core.rolling.RollingFileAppender.subAppend(
at ch.qos.logback.core.OutputStreamAppender.append(
at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(
at ch.qos.logback.classic.Logger.appendLoopOnAppenders(
at ch.qos.logback.classic.Logger.callAppenders(
at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(
at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(

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