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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$EntryIterator.next(HashMap.java:834) at java.util.HashMap$EntryIterator.next(HashMap.java:832) at java.util.HashMap.putAllForCreate(HashMap.java:435) at java.util.HashMap.<init>(HashMap.java:225) at org.slf4j.helpers.BasicMDCAdapter.getCopyOfContextMap(BasicMDCAdapter.java:130) at org.slf4j.MDC.getCopyOfContextMap(MDC.java:176) at com.bizo.logging.SmtpHandler.publish(SmtpHandler.java:65) at java.util.logging.Logger.log(Logger.java:458) at java.util.logging.Logger.doLog(Logger.java:480) at java.util.logging.Logger.log(Logger.java:503) at java.util.logging.Logger.info(Logger.java:1022)