Add Quartz Scheduler support

See gh-4299

spring-boot-samples/spring-boot-sample-quartz/src/main/java/sample/quartz/SampleJob.java

@@ -0,0 +1,20 @@
+package sample.quartz;
+
+import org.quartz.JobExecutionContext;
+import org.quartz.JobExecutionException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.scheduling.quartz.QuartzJobBean;
+
+public class SampleJob extends QuartzJobBean {
+
+	private static final Logger LOGGER = LoggerFactory.getLogger(SampleJob.class);
+
+	@Override
+	protected void executeInternal(JobExecutionContext context)
+			throws JobExecutionException {
+		LOGGER.info("Hello {}!", context.getJobDetail().getKey());
+	}
+
+}

spring-boot-samples/spring-boot-sample-quartz/src/main/java/sample/quartz/SampleQuartzApplication.java

@@ -0,0 +1,35 @@
+package sample.quartz;
+
+import org.quartz.JobBuilder;
+import org.quartz.JobDetail;
+import org.quartz.SimpleScheduleBuilder;
+import org.quartz.Trigger;
+import org.quartz.TriggerBuilder;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class SampleQuartzApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleQuartzApplication.class, args);
+	}
+
+	@Bean
+	public JobDetail jobDetail() {
+		return JobBuilder.newJob().ofType(SampleJob.class).withIdentity("sampleJob")
+				.storeDurably().build();
+	}
+
+	@Bean
+	public Trigger trigger() {
+		SimpleScheduleBuilder scheduleBuilder = SimpleScheduleBuilder.simpleSchedule()
+				.withIntervalInSeconds(10).repeatForever();
+
+		return TriggerBuilder.newTrigger().forJob(jobDetail())
+				.withIdentity("sampleTrigger").withSchedule(scheduleBuilder).build();
+	}
+
+}