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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry( at java.util.HashMap$ at java.util.HashMap$ at java.util.HashMap.putAllForCreate( at java.util.HashMap.<init>( at org.slf4j.helpers.BasicMDCAdapter.getCopyOfContextMap( at org.slf4j.MDC.getCopyOfContextMap( at com.bizo.logging.SmtpHandler.publish( at java.util.logging.Logger.log( at java.util.logging.Logger.doLog( at java.util.logging.Logger.log( at