This is going to be interesting. What is concurrent modification exception ? Java doc says :This exception may be thrown by methods that have detected concurrent modification of an object when such ...

Has the ConcurrentModificationException been thrown in you Java app? Here are four simple ways to fix the ConcurrentModificationException in your code.

This exception may be thrown by methods that have detected concurrent modification of a backing object when such modification is not permissible. For example, it is not permssible for one thread to ...

in the file RecipeLoader, does this need to run asynchronously? it seems maybe there is little benefit to being async, so maybe something like this could fix the problem? public RecipeLoader(final ...