Restore ServerProperties.getSessionTimeout()

Restore the deprecated method to give people a change to migrate. The
@DeprecatedConfigurationProperties annotation is now used to generate
the deprecated meta-data, removing the need for manual meta-data.

Closes gh-3537

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -52,6 +52,7 @@ import org.springframework.boot.context.embedded.tomcat.TomcatContextCustomizer;
 import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
 import org.springframework.boot.context.embedded.undertow.UndertowEmbeddedServletContainerFactory;
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 import org.springframework.core.Ordered;
 import org.springframework.util.StringUtils;
@@ -197,6 +198,17 @@ public class ServerProperties implements EmbeddedServletContainerCustomizer, Ord
 		this.address = address;
 	}
 
+	/**
+	 * Set the session timeout
+	 * @return the session timeout
+	 * @deprecated since 1.3.0 in favor of {@code session.timeout}.
+	 */
+	@Deprecated
+	@DeprecatedConfigurationProperty(replacement = "server.session.timeout")
+	public Integer getSessionTimeout() {
+		return this.session.getTimeout();
+	}
+
 	/**
 	 * Get the session timeout
 	 * @param sessionTimeout the session timeout

spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -161,15 +161,6 @@
     "deprecation": {
       "replacement": "spring.mvc.view.suffix"
     }
-  },
-  {
-    "name": "server.session-timeout",
-    "type": "java.lang.Integer",
-    "description": "Session timeout in seconds.",
-    "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
-    "deprecation": {
-      "replacement": "server.session.timeout"
-    }
   }
 ],"hints": [
   {