Should override javax.servlet.GenericServlet.init() instead javax.servlet.GenericServlet.init(ServletConfig) or at least overriding javax.servlet.GenericServlet.init(ServletConfig) should call super.init(ServletConfig) in AbstractGraphQLHttpServlet (
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public void init(ServletConfig servletConfig) { |
).
Now subclass of it cannot call getServletConfig()/ getServletName() due to missing of calling super.init(ServletConfig)