IntelliJ content module adding copyright-header support to GSP files, so the IDE's Copyright feature can insert and update headers in .gsp sources.
UpdateGspFileCopyright derives from the Copyright plugin‘s UpdatePsiFileCopyright and needs nothing from javaee/JSP — see that class for why the JSP original’s checks were inert here.
Content module org.apache.grails.intellij.module.copyright, shipped as lib/modules/org.apache.grails.intellij.module.copyright.jar. The module name, the descriptor file name and the jar base name are one three-way contract — see the intellij-module convention plugin.
Requires the com.intellij.copyright plugin at runtime.