An interesting issue

So I ran into an interesting issue today and I wanted to share it because I didn't find an explanation anywhere on the internet.

I'm not sure this issue require a fix but still it was annoying to ran into.

So today, my GWT application (GWT 2.7) didn't want to start for no obvious reason (in Debug mode or SDM). Right after the server started, I got the famous:

com.google.gwt.user.client.rpc.SerializationException: Type 'MyClass' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable'

Since I didn't have any modified files and that it was working fine 30mn before, I knew it was not a code issue. So I cleared all my caches and tried again but still no luck. I checked my deployed folder and the gwt.rpc file was there and correct.

Then I dug into GWT and found out that my application was using the LegacySerializationPolicy (hence the SerializationException).

Turns out, I had forgotten to close the browser tab of a previous SDM instance and even though I killed it from my IDE, my application was still running in the browser.

In our application we send request every 10s to check for update. So when I started my server, a request was received before the gwt.rpc file was built (and put into the deployment folder), and since GWT couldn't find this file it was using the LegacySerializationPolicy and was caching it in memory, so GWT would never use my gwt.rpc file...

Conclusion: Never forget to close the browser tab. :)

Cheers

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