Support Quartz trigger without JobDetail

This commit allows to create a Quartz trigger implementation via
either `CronTriggerFactoryBean` or `SimpleTriggerFactoryBean` even if no
job detail is provided.

Issue: SPR-13604
(cherry picked from commit 2970065)

spring-context-support/src/main/java/org/springframework/scheduling/quartz/CronTriggerFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -237,7 +237,9 @@ public class CronTriggerFactoryBean implements FactoryBean<CronTrigger>, BeanNam
 		CronTriggerImpl cti = new CronTriggerImpl();
 		cti.setName(this.name);
 		cti.setGroup(this.group);
-		cti.setJobKey(this.jobDetail.getKey());
+		if (this.jobDetail != null) {
+			cti.setJobKey(this.jobDetail.getKey());
+		}
 		cti.setJobDataMap(this.jobDataMap);
 		cti.setStartTime(this.startTime);
 		cti.setCronExpression(this.cronExpression);

spring-context-support/src/main/java/org/springframework/scheduling/quartz/SimpleTriggerFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -228,7 +228,9 @@ public class SimpleTriggerFactoryBean implements FactoryBean<SimpleTrigger>, Bea
 		SimpleTriggerImpl sti = new SimpleTriggerImpl();
 		sti.setName(this.name);
 		sti.setGroup(this.group);
-		sti.setJobKey(this.jobDetail.getKey());
+		if (this.jobDetail != null) {
+			sti.setJobKey(this.jobDetail.getKey());
+		}
 		sti.setJobDataMap(this.jobDataMap);
 		sti.setStartTime(this.startTime);
 		sti.setRepeatInterval(this.repeatInterval);

spring-context-support/src/test/java/org/springframework/scheduling/quartz/CronTriggerFactoryBeanTests.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.scheduling.quartz;
+
+import java.text.ParseException;
+
+import org.junit.Test;
+import org.quartz.CronTrigger;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author Stephane Nicoll
+ */
+public class CronTriggerFactoryBeanTests {
+
+	@Test
+	public void createWithoutJobDetail() throws ParseException {
+		CronTriggerFactoryBean factory = new CronTriggerFactoryBean();
+		factory.setName("myTrigger");
+		factory.setCronExpression("0 15 10 ? * *");
+		factory.afterPropertiesSet();
+		CronTrigger trigger = factory.getObject();
+		assertEquals("0 15 10 ? * *", trigger.getCronExpression());
+	}
+
+}

spring-context-support/src/test/java/org/springframework/scheduling/quartz/SimpleTriggerFactoryBeanTests.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.scheduling.quartz;
+
+import java.text.ParseException;
+
+import org.junit.Test;
+import org.quartz.SimpleTrigger;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author Stephane Nicoll
+ */
+public class SimpleTriggerFactoryBeanTests {
+
+	@Test
+	public void createWithoutJobDetail() throws ParseException {
+		SimpleTriggerFactoryBean factory = new SimpleTriggerFactoryBean();
+		factory.setName("myTrigger");
+		factory.setRepeatCount(5);
+		factory.setRepeatInterval(1000L);
+		factory.afterPropertiesSet();
+		SimpleTrigger trigger = factory.getObject();
+		assertEquals(5, trigger.getRepeatCount());
+		assertEquals(1000L, trigger.getRepeatInterval());
+	}
+
+}