Re: Getting ConcurrentModificationException

Thanks for your help. On server side I've used single thread executor to send all UI messages sequentially, then also I'm getting same exception.

Actually we are using GWT event service to send asynchronous messages from server to client. So now all RemoteEventServiceServlet.addEvent() are executed sequentially, then also it gives ConcurrentModificationException.

On Tuesday, December 10, 2013 6:36:32 PM UTC+5:30, Jens wrote:

I don't think its a problem with GWT. 

It's more likely that your own server code has a multi-threading bug that you are not yet aware of. While request A is done and a HashMap is serialized by GWT to send it to the browser, a second request B modifies the same HashMap instance which results in the exception you see.

-- J.

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