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According to the runtime error message the Exception occurs in the following line; VirusData v = iteratorVirusDB.next(); VirusData is a class with a constructor and an overloaded constructor containing specific information about each of the viruses in the database such as; String vName String vDefinition Overloaded with Array with Tokenized definition (separated in groups of xLength) Array with LCS Tokens Float with a grade iteratorVirusDB of type <VirusData> is an .iterator() of VirusDB , as shown bellow: Iterator<VirusData> iteratorVirusDB = virusDB.iterator(); VirusDB is and ArrayList of type <VirusData> where I store the virus objects (name and def at this point) so that I can use them later. ArrayList <VirusData> virusDB = new ArrayList<VirusData>(); And to end with, the error occurs in this method which uses all of the above explained: private void selectDabataseMouseClicked(java.awt.event.MouseEvent evt) { while(iteratorVirusDB.hasNext()) { VirusData v = iteratorVirusDB.next(); //ERROR LINE String vSig = v.signature; v.tokens = tokenize.raw(vSig, true, tLength); ... } ... } I could really do with some help and advice on how to approach this problem in order to get get the program to run successfully. Bellow, the full StackTrace: run: Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at project_cle

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