Change default version of Jetty to 9.3

Closes gh-5825

spring-boot-docs/src/main/asciidoc/getting-started.adoc

@@ -37,9 +37,9 @@ diverge from the defaults.
 [[getting-started-system-requirements]]
 == System Requirements
 By default, Spring Boot {spring-boot-version} requires http://www.java.com[Java 7] and
-Spring Framework {spring-version} or above. You can use Spring Boot with Java 6 with some additional
-configuration. See <<howto.adoc#howto-use-java-6>> for more details. Explicit build support
-is provided for Maven (3.2+) and Gradle (1.12+).
+Spring Framework {spring-version} or above. You can use Spring Boot with Java 6 with some
+additional configuration. See <<howto.adoc#howto-use-java-6>> for more details. Explicit
+build support is provided for Maven (3.2+) and Gradle (1.12+).
 
 TIP: Although you can use Spring Boot with Java 6 or 7, we generally recommend Java 8 if at
 all possible.
@@ -58,7 +58,11 @@ The following embedded servlet containers are supported out of the box:
 |3.0
 |Java 6+
 
-|Jetty 9
+|Jetty 9.3
+|3.1
+|Java 8+
+
+|Jetty 9.2
 |3.1
 |Java 7+
 

spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -920,10 +920,67 @@ You can change the Tomcat version by setting the `tomcat.version` property:
 
 
 
+[[howto-use-jetty-9.2]]
+=== Use Jetty 9.2
+Jetty 9.2 works with Spring Boot, but the default is to use Jetty 9.3. If you cannot use
+Jetty 9.3 (for example, because you are using Java 7) you will need to change your
+classpath to reference Jetty 9.2.
+
+
+
+[[howto-use-jetty-9.2-maven]]
+==== Use Jetty 9.2 with Maven
+
+If you are using the starters and parent you can just add the Jetty starter and override
+the `jetty.version` property:
+
+[source,xml,indent=0,subs="verbatim,quotes,attributes"]
+----
+	<properties>
+		<jetty.version>9.2.17.v20160517</jetty.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-starter-tomcat</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jetty</artifactId>
+		</dependency>
+	</dependencies>
+----
+
+
+
+[[howto-use-jetty-9.2-gradle]]
+==== Use Jetty 9.2 with Gradle
+
+You can set the `jetty.version` property. For example, for a simple webapp or service:
+
+[source,groovy,indent=0,subs="verbatim,quotes,attributes"]
+----
+	ext['jetty.version'] = '9.2.17.v20160517'
+	dependencies {
+		compile ('org.springframework.boot:spring-boot-starter-web') {
+			exclude group: 'org.springframework.boot', module: 'spring-boot-starter-tomcat'
+		}
+		compile ('org.springframework.boot:spring-boot-starter-jetty')
+	}
+----
+
+
+
 [[howto-use-jetty-8]]
 === Use Jetty 8
-Jetty 8 works with Spring Boot, but the default is to use Jetty 9. If you cannot use
-Jetty 9 (for example, because you are using Java 1.6) you will need to change your
+Jetty 8 works with Spring Boot, but the default is to use Jetty 9.3. If you cannot use
+Jetty 9.3 (for example, because you are using Java 1.6) you will need to change your
 classpath to reference Jetty 8. You will also need to exclude Jetty's WebSocket-related
 dependencies.