Added support for specifying a TransactionManager

Before this commit, Spring Cloud Task did not correctly configure the
provided PlatformTransactionManager with the TaskRepository.  This
commit addressis this bug.

Resolves #652

Polished PR on Merge

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/configuration/SimpleTaskAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2019 the original author or authors.
+ * Copyright 2015-2020 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.
@@ -28,7 +28,6 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.aop.scope.ScopedProxyUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.ApplicationArguments;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.task.repository.TaskExplorer;
@@ -89,8 +88,7 @@ public class SimpleTaskAutoConfiguration {
 	}
 
 	@Bean
-	@ConditionalOnMissingBean
-	public PlatformTransactionManager transactionManager() {
+	public PlatformTransactionManager springCloudTaskTransactionManager() {
 		return this.platformTransactionManager;
 	}
 

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/repository/TaskRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2019 the original author or authors.
+ * Copyright 2015-2020 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.
@@ -26,6 +26,7 @@ import org.springframework.transaction.annotation.Transactional;
  * information.
  *
  * @author Glenn Renfro
+ * @author Michael Minella
  */
 public interface TaskRepository {
 
@@ -37,7 +38,7 @@ public interface TaskRepository {
 	 * @param exitMessage to be stored for the task.
 	 * @return the updated {@link TaskExecution}
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution completeTaskExecution(long executionId, Integer exitCode, Date endTime,
 			String exitMessage);
 
@@ -51,7 +52,7 @@ public interface TaskRepository {
 	 * @return the updated {@link TaskExecution}
 	 * @since 1.1.0
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution completeTaskExecution(long executionId, Integer exitCode, Date endTime,
 			String exitMessage, String errorMessage);
 
@@ -64,7 +65,7 @@ public interface TaskRepository {
 	 * TaskExecution's taskExecutionId will also contain the id that was used to store the
 	 * TaskExecution.
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution createTaskExecution(TaskExecution taskExecution);
 
 	/**
@@ -75,7 +76,7 @@ public interface TaskRepository {
 	 * @param name task name to be associated with the task execution.
 	 * @return the initial {@link TaskExecution}
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution createTaskExecution(String name);
 
 	/**
@@ -85,7 +86,7 @@ public interface TaskRepository {
 	 * launching, etc).
 	 * @return the initial {@link TaskExecution}
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution createTaskExecution();
 
 	/**
@@ -97,7 +98,7 @@ public interface TaskRepository {
 	 * @param externalExecutionId id assigned to the task by the platform.
 	 * @return TaskExecution created based on the parameters.
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution startTaskExecution(long executionid, String taskName, Date startTime,
 			List<String> arguments, String externalExecutionId);
 
@@ -106,7 +107,7 @@ public interface TaskRepository {
 	 * @param executionid to the task execution to be updated.
 	 * @param externalExecutionId id assigned to the task by the platform.
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	void updateExternalExecutionId(long executionid, String externalExecutionId);
 
 	/**
@@ -120,7 +121,7 @@ public interface TaskRepository {
 	 * @return A TaskExecution that contains the information available at the beginning of
 	 * a TaskExecution.
 	 */
-	@Transactional
+	@Transactional("springCloudTaskTransactionManager")
 	TaskExecution startTaskExecution(long executionid, String taskName, Date startTime,
 			List<String> arguments, String externalExecutionId, Long parentExecutionId);