web.xml - Deployment Descriptor

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="https://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">

    <display-name>Servlet 3.0 application</display-name>

https://www.baeldung.com/spring-security-expressions
override 30 min default - to maintain Session
    <session-config>
        <session-timeout>10</session-timeout>
    </session-config>

    <filter>
        <filter-name>ServletMappedDoFilter_Filter</filter-name>
        <filter-class>tests.Filter.DoFilter_Filter</filter-class>
    <init-param>
      <param-name>attribute</param-name>
      <param-value>tests.Filter.DoFilter_Filter.SERVLET_MAPPED</param-value>
    </init-param>
  </filter>

    <filter-mapping>
        <filter-name>ServletMappedDoFilter_Filter</filter-name>
        <url-pattern>/DoFilterTest</url-pattern>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>

    <listener>
        <listener-class>tests.ContextListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>welcome</servlet-name>
        <servlet-class>WelcomeServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>welcome</servlet-name>
        <url-pattern>/hello.welcome</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>redteam</servlet-name>
        <servlet-class>mysite.server.TeamServlet</servlet-class>
        <init-param>
            <param-name>teamColor</param-name>
            <param-value>red</param-value>
        </init-param>
        <init-param>
            <param-name>bgColor</param-name>
            <param-value>#CC0000</param-value>
        </init-param>
    </servlet>

    <welcome-file-list>
        <welcome-file>hello.welcome</welcome-file>
    </welcome-file-list>

    <error-page>
        <exception-type>java.lang.ArrayIndexOutOfBoundsException</exception-type>
        <location>/ServletErrorPage</location>
    </error-page>

  <error-page>
      <error-code>404</error-code>
      <location>/error404.html</location>
  </error-page>

    <taglib>
        <taglib-uri>/i18ntaglib</taglib-uri>
        <taglib-location>/WEB-INF/tlds/i18ntaglib.tld </taglib-location>
  </taglib>

    <servlet>
        <servlet-name>register</servlet-name>
        <jsp-file>/register/start.jsp</jsp-file>
    </servlet>


    App Engine supports automatic compilation and URL mapping for JSPs. A JSP file in the application's WAR (outside of WEB-INF/) whose filename ends in .jsp is compiled into a servlet class automatically, and mapped to the URL path equivalent to the path to the JSP file from the WAR root. For example, if an app has a JSP file named start.jsp in a subdirectory named register/ in its WAR, App Engine compiles it and maps it to the URL path /register/start.jsp.

If you want more control over how the JSP is mapped to a URL, you can specify the mapping explicitly by declaring it with a <servlet> element in the deployment descriptor. Instead of a <servlet-class> element, you specify a <jsp-file> element with the path to the JSP file from the WAR root. The <servlet> element for the JSP can contain initialization parameters.

    See https://cloud.google.com/appengine/docs/standard/java/config/webxml

    <servlet-mapping>
        <servlet-name>register</servlet-name>
        <url-pattern>/register/*</url-pattern>
    </servlet-mapping>

</web-app>