Thread: Synchronized is blocking

I'm just starting up with Java Mulithreading.
Below is the repo I set up, and I am having trouble with this test I am doing playing around with Executor threadpools. I am trying to setup a managed system where I first add some lines to be printed, then add the work to the work pool, and then finally launch n number of threads to handle the work (or in this case, print out the strings I added to WorkManager instance fields). I watched this series of videos starting with this one: https://www.youtube.com/watch?v=YdlnEWC-7Wo, and I planned on playing with the concept of multithreading, but it doesn't seem to work and gets stuck at Thread1:27. I thought that by synchronizing access to the ListIterator return, that it would not block.

https://github.com/hhbhagat/ThreadPoolTest

Thanks.

I'm not too sure about your syntax

    public T getSomeWork() {
        synchronized (getwork) {
            return iterWorkList.next();  //This gives some work/work info to the calling method, and gives out whatever T is from the iterWorkList iterator.
        }
    }

I'm thinking it should read something like

public synchronized T getSomeWork() {
    return iterWorkList.next();
}

Ok, So I checked it out, and I was getting ConcurrentModificationExceptions out the wazoo. I am guessing that since it was a different thread, those exceptions (that i didn't try-catch) didn't bubble up to the main output. Im going to try and see if I can understand more of what is going on from KevinWorkman's link.

Well, in my main, I first have it adding strings to the tasks to be completed, and then I have several threads added to a pool where they are left to their own devices getting work from the pool. So I am not adding AND getting at the same time directly, but getNextJob may be causing it to be so because of an internal index in the ListIterator interface. Am I correct? I tried to make it a volatile List, but I am still getting the exception.