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    <p>You've shows us how map <code>Tabs</code> is created (Java naming conventions would dictate its name begin with a lowercase letter), but not how it is populated. As it is, the map would always be empty, and the while loop would run zero times. Also, the local variable <code>tabname</code> is unused, but presumably is not unused in your actual code.</p> <p>That said, it appears that <code>ProcessEvent</code> will be run once for every event. It is static, and synchronized, which means that it will obtain the monitor for <code>MainActivity.class,</code> and no other method that synchronizes on the same object can run at the same time.</p> <p>However, it starts a new thread, which does the actual work, and returns immediately. That thread is not synchronized, and so any number of these worker threads can be running at the same time, all using the same map. The map is wrapped with <code>Collections.synchronizedMap</code> and that is the only protection against concurrent modifications.</p> <p>Such a synchronized map will not allow multiple callers to call its methods at the same time, but separate calls to different methods can be interleaved arbitrarily. For instance, while one caller is putting a new entry into the map, no other caller can access the map. However, it is possible for one caller to get the key set from the map, get the iterator from the key set, and start iterating over it, and then for another caller in another thread to add, modify, or remove an entry, and, finally, for the first thread to continue iterating over the key set and get a <code>ConcurrentModificationException.</code></p> <p>I would suggest using <code>java.util.concurrent.ConcurrentHashMap</code> instead, and removing the synchronized keyword from <code>ProcessEvent.</code></p>
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    1. USDavid Conrad
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    1. COYou hit the nail on the head, thanks to this complete explaination I was able to make some additional debugging and found out that this exception is happening exactly when processing another kind of event, which ADDS a new tab in background. So I'm going to make the needed changes keeping in mind all the valuable responses in this thread. I've upvoted all the useful comments but this one helped me the most so I'm accepting it. Thanks guys!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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