Give human readable errors when schedule name is invalid.

resolves #320

src/main/java/org/springframework/cloud/deployer/scheduler/spi/kubernetes/KubernetesScheduler.java

@@ -21,6 +21,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 import io.fabric8.kubernetes.api.model.Container;
@@ -67,6 +68,9 @@ public KubernetesScheduler(KubernetesClient kubernetesClient,
 
 	@Override
 	public void schedule(ScheduleRequest scheduleRequest) {
+		if(scheduleRequest != null) {
+			validateScheduleName(scheduleRequest);
+		}
 		try {
 			createCronJob(scheduleRequest);
 		}
@@ -81,6 +85,16 @@ public void schedule(ScheduleRequest scheduleRequest) {
 		}
 	}
 
+	public void validateScheduleName(ScheduleRequest request) {
+		if(request.getScheduleName() == null) {
+			throw new CreateScheduleException("The name for the schedule request is null", null);
+		}
+		if(!Pattern.matches("^[a-z0-9]([-a-z0-9]*[a-z0-9])?$", request.getScheduleName())) {
+			throw new CreateScheduleException("Invalid Format for Schedule Name.   Name can only contain lowercase letters, numbers 0-9 and hyphens.", null);
+		}
+
+	}
+
 	@Override
 	public void unschedule(String scheduleName) {
 		boolean unscheduled = this.kubernetesClient.batch().cronjobs().withName(scheduleName).delete();

src/test/java/org/springframework/cloud/deployer/scheduler/spi/kubernetes/KubernetesSchedulerTestsScheduler.java

@@ -148,6 +148,16 @@ public void testMissingSchedule() {
 		fail();
 	}
 
+	@Test(expected = CreateScheduleException.class)
+	public void testInvalidNameSchedule() {
+		AppDefinition appDefinition = new AppDefinition("AAAAAA", null);
+		ScheduleRequest scheduleRequest = new ScheduleRequest(appDefinition, null, null, null, "AAAAA", testApplication());
+
+		scheduler.schedule(scheduleRequest);
+
+		fail();
+	}
+
 	@Test(expected = CreateScheduleException.class)
 	public void testInvalidCronSyntax() {
 		Map<String, String> schedulerProperties = Collections.singletonMap(CRON_EXPRESSION, "1 2 3 4");