Java concurrent modification exception

Question

I have written following code which is resulting in concurrent modification exception. How can I prevent it ? The idea is to escape all values of the Map and reconstruct the obj

Answer 1

Not sure you need to alter the keys of Map, it appears all you want to do is alter the values in the arrays.

for(String[] values: dO.getParameterMap().values()) 
    for (int i = 0; i < values.length; i++) 
        values[i] = escapeHTML(values[i]);

I would make sure the Map does have null values stored. But if you can't change this you will need to add if(values != null)