declare namespace javax {
    namespace servlet {
        class UnavailableException extends javax.servlet.ServletException {
            public constructor(arg0: javax.servlet.Servlet, arg1: java.lang.String | string)
            public constructor(arg0: int, arg1: javax.servlet.Servlet, arg2: java.lang.String | string)
            public constructor(arg0: java.lang.String | string)
            public constructor(arg0: java.lang.String | string, arg1: int)
            public isPermanent(): boolean
            public getServlet(): javax.servlet.Servlet
            public getUnavailableSeconds(): int
            public static class: java.lang.Class<any>
        }
    }
}