Add Quartz Scheduler support

See gh-4299

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -129,6 +129,11 @@ content into your application; rather pick only the properties that you need.
 	spring.profiles.active= # Comma-separated list (or list if using YAML) of <<howto-set-active-spring-profiles,active profiles>>.
 	spring.profiles.include= # Unconditionally activate the specified comma separated profiles (or list of profiles if using YAML).
 
+	# QUARTZ SCHEDULER ({sc-spring-boot-autoconfigure}/quartz/QuartzProperties.{sc-ext}[QuartzProperties])
+	spring.quartz.initializer.enabled=true # Create the required Quartz Scheduler tables on startup if necessary. Enabled automatically if the schema is configured.
+	spring.quartz.properties.*= # Additional Quartz Scheduler properties.
+	spring.quartz.schema=classpath:org/quartz/impl/jdbcjobstore/tables_@@platform@@.sql # Path to the SQL file to use to initialize the database schema.
+
 	# Reactor
 	spring.reactor.stacktrace-mode.enabled=false # Set whether Reactor should collect stacktrace information at runtime.
 

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

@@ -1,5 +1,5 @@
 = Spring Boot Reference Guide
-Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson; Marcel Overdijk; Christian Dupuis; Sébastien Deleuze; Michael Simons
+Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson; Marcel Overdijk; Christian Dupuis; Sébastien Deleuze; Michael Simons; Vedran Pavić
 :doctype: book
 :toc:
 :toclevels: 4

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

@@ -5151,6 +5151,37 @@ caching is enabled.
 
 
 
+[[boot-features-quartz]]
+== Quartz Scheduler
+
+If Quartz Scheduler and the relevant libraries (as defined by `spring-boot-starter-quartz`)
+are on the classpath, Spring Boot will auto-configure a `SchedulerFactoryBean` which
+provides `Scheduler` instance that you can inject in your application.
+
+Beans of following types will be automatically picked up and added to
+`SchedulerFactoryBean`:
+
+* `JobDetail`
+* `Calendar`
+* `Trigger`
+
+By default, an in-memory `JobStore` will be used. However, if `DataSource` bean is
+available in your application, Quartz Scheduler will be configured with a persistent
+`JobStore`.
+
+When using a persistent `JobStore`, Quartz database schema can be initialized using
+`QuartzDatabaseInitializer` if the location of schema script is configured using
+`spring.quartz.schema` property.
+
+Quartz Scheduler configuration can also be customized using Quartz configuration properties
+(see `spring.quartz.properties.*`) and `SchedulerFactoryBeanCustomizer` beans which
+allows programmatic `SchedulerFactoryBean` customization.
+
+Spring Boot also configures `JobFactory` that is `@Autowire` capable so you can easily
+inject beans from `applicationContext` and use them in your Quartz jobs.
+
+
+
 [[boot-features-integration]]
 == Spring Integration
 Spring Boot offers several conveniences for working with Spring Integration, including