May, but this only guessing, because we did not use java9/10 at the moment (still with java8) and in addition stepped away from the classloader handling of gwtmockito (after having some issues), you have to include net.bytebuddy to the list of classes loaded by the standard classloader.
You could do this be sub classing GwtMockitoTestRunnerand overwrite/extend getPackagesToLoadViaStandardClassloader or using the WithPackagesToLoadViaStandardClassLoader annotation.
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