Remove support for Resin Servlet container

This commit removes all references to the Resin Servlet container, as it
is not supported as of Spring Framework 6.0 because we require a
JakartaEE baseline.

Closes gh-33772

framework-docs/modules/ROOT/pages/data-access/orm/jpa.adoc

@@ -142,8 +142,7 @@ Alternatively, specify a custom `persistenceXmlLocation` on your
 META-INF/my-persistence.xml) and include only a descriptor with that name in your
 application jar files. Because the Jakarta EE server looks only for default
 `META-INF/persistence.xml` files, it ignores such custom persistence units and, hence,
-avoids conflicts with a Spring-driven JPA setup upfront. (This applies to Resin 3.1, for
-example.)
+avoids conflicts with a Spring-driven JPA setup upfront.
 
 .When is load-time weaving required?
 ****

framework-docs/modules/ROOT/pages/web/webmvc/mvc-config/default-servlet-handler.adoc

@@ -21,7 +21,7 @@ The caveat to overriding the `/` Servlet mapping is that the `RequestDispatcher`
 default Servlet must be retrieved by name rather than by path. The
 `DefaultServletHttpRequestHandler` tries to auto-detect the default Servlet for
 the container at startup time, using a list of known names for most of the major Servlet
-containers (including Tomcat, Jetty, GlassFish, JBoss, Resin, WebLogic, and WebSphere).
+containers (including Tomcat, Jetty, GlassFish, JBoss, WebLogic, and WebSphere).
 If the default Servlet has been custom-configured with a different name, or if a
 different Servlet container is being used where the default Servlet name is unknown,
 then you must explicitly provide the default Servlet's name, as the following example shows:

spring-context/src/main/java/org/springframework/instrument/classloading/ReflectiveLoadTimeWeaver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,9 +53,6 @@ import org.springframework.util.ReflectionUtils;
  * web application). There is no direct API dependency between this LoadTimeWeaver
  * adapter and the underlying ClassLoader, just a 'loose' method contract.
  *
- * <p>This is the LoadTimeWeaver to use, for example, with the Resin application server
- * version 3.1+.
- *
  * @author Costin Leau
  * @author Juergen Hoeller
  * @since 2.0

spring-web/src/main/java/org/springframework/web/util/WebAppRootListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,7 +35,7 @@ import jakarta.servlet.ServletContextListener;
  *
  * <p><b>WARNING</b>: Some containers, for example, Tomcat, do NOT keep system properties separate
  * per web app. You have to use unique "webAppRootKey" context-params per web app
- * then, to avoid clashes. Other containers like Resin do isolate each web app's
+ * then, to avoid clashes. Other containers do isolate each web app's
  * system properties: Here you can use the default key (i.e. no "webAppRootKey"
  * context-param at all) without worrying.
  *

spring-webmvc/src/main/java/org/springframework/web/servlet/resource/DefaultServletHttpRequestHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,7 +44,7 @@ import org.springframework.web.context.ServletContextAware;
  * name specified through the {@link #setDefaultServletName "defaultServletName" property}.
  * In most cases, the {@code defaultServletName} does not need to be set explicitly, as the
  * handler checks at initialization time for the presence of the default Servlet of well-known
- * containers such as Tomcat, Jetty, Resin, WebLogic and WebSphere. However, when running in a
+ * containers such as Tomcat, Jetty, WebLogic and WebSphere. However, when running in a
  * container where the default Servlet's name is not known, or where it has been customized
  * via server configuration, the {@code defaultServletName} will need to be set explicitly.
  *
@@ -60,9 +60,6 @@ public class DefaultServletHttpRequestHandler implements HttpRequestHandler, Ser
 	/** Default Servlet name used by Google App Engine. */
 	private static final String GAE_DEFAULT_SERVLET_NAME = "_ah_default";
 
-	/** Default Servlet name used by Resin. */
-	private static final String RESIN_DEFAULT_SERVLET_NAME = "resin-file";
-
 	/** Default Servlet name used by WebLogic. */
 	private static final String WEBLOGIC_DEFAULT_SERVLET_NAME = "FileServlet";
 
@@ -99,9 +96,6 @@ public class DefaultServletHttpRequestHandler implements HttpRequestHandler, Ser
 			else if (this.servletContext.getNamedDispatcher(GAE_DEFAULT_SERVLET_NAME) != null) {
 				this.defaultServletName = GAE_DEFAULT_SERVLET_NAME;
 			}
-			else if (this.servletContext.getNamedDispatcher(RESIN_DEFAULT_SERVLET_NAME) != null) {
-				this.defaultServletName = RESIN_DEFAULT_SERVLET_NAME;
-			}
 			else if (this.servletContext.getNamedDispatcher(WEBLOGIC_DEFAULT_SERVLET_NAME) != null) {
 				this.defaultServletName = WEBLOGIC_DEFAULT_SERVLET_NAME;
 			}