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Editorial Team
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Asked: 2026-06-05T16:15:55+00:00

I created a website using Canvas on the client side to display animations. Sometimes

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I created a website using Canvas on the client side to display animations. Sometimes it happens that the animations stop moving out of a sudden, so I ran the application in debug mode and got this strange error:

com.google.gwt.dev.shell.HostedModeException: Something other than an int was returned from JSNI method '@com.google.gwt.dom.client.ImageElement::getWidth()': JS value of type undefined, expected int

What could be the reason for this behavior? How can a function suddently undefine its return type?

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1 Answer

  1. Editorial Team

    Your code should be alright.
    This is a known chrome GWT plugin issue. This happens sporadically without any rule, the easiest solution is to use Firefox for debugging – it’s more stable.

    Here is the link for issue discussion: click here

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