Accepted answer

from the documentation at,

webappdirectory file - location on filesystem where gwt will write output files (-out option to gwtcompiler). default value is: ${}/${}. user property is: gwt.war.

you appear to be using -war instead, which i believe is the much older version of -out, but adding <webappdirectory>${}/thisfolder</webappdirectory> to your configuration should achieve the desired result.

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