web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <servlet>
    <servlet-name>jersey</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>jersey.config.server.provider.packages</param-name>
      <!-- adding 'io.swagger.jaxrs2.integration.listing' is sufficent on it own to register the following paths:
      /openApi.json : OpenApi spec in json
      /openApi.yaml : OpenApi spec in yaml
      /openApi (Accept:  : "application/json" : OpenApi spec in json
      /openApi (Accept:  : "application/yaml" : OpenApi spec in yaml
      <param-value>
        com.fasterxml.jackson.jaxrs.json,io.swagger.jaxrs2.integration.listing,io.swagger.sample.resource
      </param-value>
      -->
      <param-value>
        com.fasterxml.jackson.jaxrs.json,io.swagger.sample.resource
      </param-value>
    </init-param>
<!-- specify config location
    <init-param>
      <param-name>openApi.configuration.location</param-name>
      <param-value>/openapi-configuration.json</param-value>
    </init-param>
-->
    <init-param>
      <param-name>jersey.config.server.wadl.disableWadl</param-name>
      <param-value>true</param-value>
    </init-param>
    <!-- specify resource package
    <init-param>
      <param-name>openApi.configuration.resourcePackage</param-name>
      <param-value>com.fasterxml.jackson.jaxrs.json,io.swagger.sample.resource</param-value>
    </init-param>
-->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>jersey</servlet-name>
    <url-pattern>/api/*</url-pattern>
  </servlet-mapping>

  <filter>
    <filter-name>ApiOriginFilter</filter-name>
    <filter-class>io.swagger.sample.util.ApiOriginFilter</filter-class>
  </filter>

  <servlet>
    <!-- use OpenApi servlet to serve spec -->
    <servlet-name>OpenApi</servlet-name>
    <servlet-class>io.swagger.jaxrs2.integration.OpenApiServlet</servlet-class>

<!-- specify resource package
    <init-param>
      <param-name>openApi.configuration.resourcePackage</param-name>
      <param-value>com.fasterxml.jackson.jaxrs.json,io.swagger.sample.resource</param-value>
    </init-param>
-->
    <init-param>
      <param-name>openApi.configuration.location</param-name>
      <param-value>/openapi-configuration.json</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>OpenApi</servlet-name>
    <url-pattern>/openapi/*</url-pattern>
  </servlet-mapping>
<!-- use own Bootstrap servlet
  <servlet>
    <servlet-name>Bootstrap</servlet-name>
    <servlet-class>io.swagger.sample.Bootstrap</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>
-->
  <filter-mapping>
    <filter-name>ApiOriginFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>