I don't believe GWT supports Java 12 yet. I'd recommend just using Java 8.
And you might want to use the latest GWT version (2.8.2). -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/google-web-toolkit/4ca3b454-859f-4a6d-9e60-c935ae2d5ca5%40googlegroups.com.
