Removing element in ArrayList using INDEX causing java.util.ConcurrentModificationException

Question

The following code is causing

java.util.ConcurrentModificationException

I am not sure how to solve the error please help !

ArrayList strList =  new ArrayList<String>(Arrays.asList(cmd.split(" ")));

        if (strList.get(0).equals("LIST")) {

        }

        if (strList.get(0).equals("DEPEND")) {
            strList.remove(0); // getting error at this point 
            cm.createComponent(strList);

        }

Full Method The outer loop is not related to the List

public static void main(String[] args) throws IOException {
        ComponentManager cm = new ComponentManager();

    List<String> lines = Files.readAllLines(Paths.get("cmdList.txt"));
    for (String cmd : lines) {
        ArrayList strList =  new ArrayList<String>(Arrays.asList(cmd.split(" ")));

        if (strList.get(0).equals("LIST")) {

        }

        if (strList.get(0).equals("DEPEND")) {
            strList.remove(0);
            cm.createComponent(strList);

        }

        if (strList.get(0).equals("INSTALL")) {

        }

        if (strList.get(0).equals("REMOVE")) {

        }

    }

}

Can you show us full stack trace? It is like there is another problem. — aios
– aios, Commented Sep 27, 2016 at 6:18
@JimGarrison But since the list is wrapped in an ArrayList, the OP shouldn't be seeing UnsupportedOperationException either. Definitely a case of missing details from the question. — nbrooks
– nbrooks, Commented Sep 27, 2016 at 6:19

Community · Accepted Answer · 2017-05-23 12:06:54Z

1

You can create a different ArrayList and perform remove operation there or put up an iterator on the arrayList and remove using the iterator.

Find a couple of potential solutions to your problem here and here.

edited May 23, 2017 at 12:06

CommunityBot

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answered Sep 27, 2016 at 6:43

Akash Mishra

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