Hmm sounds like a bug or you have two different gwt-user.jar on class path (2.6 and 2.7). Check mvn dependency:tree.--
Character.forDigit(int) does only exist in the super sourced version of Character and is used by super sourced versions of Character and Long. This change has been introduced by commit https://gwt.googlesource.com/gwt/+/84545ae6961e3b20891f917c0f58015f3f78c1b1
Looks like the compiler does see Character.forDigit(int) in the super sourced version of Character while analyzing the super sourced version of Long provided by GWT 2.7.
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