SingleStepBatch Job can be used with spring-cloud-task-stream

resolves #799

Added config to reduce testcontainer logging

Updated to use task starter

spring-cloud-task-stream/src/main/java/org/springframework/cloud/task/batch/listener/BatchEventAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2019 the original author or authors.
+ * Copyright 2016-2021 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.
@@ -28,6 +28,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -182,6 +183,7 @@ public class BatchEventAutoConfiguration {
 	@EnableBinding(BatchEventsChannels.class)
 	@EnableConfigurationProperties(TaskEventProperties.class)
 	@ConditionalOnMissingBean(name = JOB_EXECUTION_EVENTS_LISTENER)
+	@ConditionalOnExpression("T(org.springframework.util.StringUtils).isEmpty('${spring.batch.job.jobName:}')")
 	public static class JobExecutionListenerConfiguration {
 
 		@Autowired

spring-cloud-task-stream/src/main/java/org/springframework/cloud/task/listener/TaskEventAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2019 the original author or authors.
+ * Copyright 2016-2021 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.
@@ -20,6 +20,7 @@ import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.cloud.stream.annotation.EnableBinding;
 import org.springframework.cloud.stream.annotation.Output;
@@ -33,10 +34,12 @@ import org.springframework.messaging.MessageChannel;
 
 /**
  * @author Michael Minella
+ * @author Glenn Renfro
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass(EnableBinding.class)
 @ConditionalOnBean(TaskLifecycleListener.class)
+@ConditionalOnExpression("T(org.springframework.util.StringUtils).isEmpty('${spring.batch.job.jobName:}')")
 // @checkstyle:off
 @ConditionalOnProperty(prefix = "spring.cloud.task.events", name = "enabled",
 		havingValue = "true", matchIfMissing = true)

spring-cloud-task-stream/src/test/java/org/springframework/cloud/task/batch/listener/JobExecutionEventTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2019 the original author or authors.
+ * Copyright 2016-2021 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.
@@ -23,6 +23,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
@@ -339,6 +340,27 @@ public class JobExecutionEventTests {
 		});
 	}
 
+	@Test
+	public void singleStepBatchJobSkip() {
+		ApplicationContextRunner applicationContextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(
+				EventJobExecutionConfiguration.class,
+				PropertyPlaceholderAutoConfiguration.class,
+				TestSupportBinderAutoConfiguration.class,
+				SimpleTaskAutoConfiguration.class, SingleTaskConfiguration.class))
+			.withUserConfiguration(
+				BatchEventAutoConfiguration.JobExecutionListenerConfiguration.class)
+			.withPropertyValues("--spring.cloud.task.closecontext_enabled=false",
+				"--spring.main.web-environment=false", "spring.batch.job.jobName=FOO");
+		applicationContextRunner.run((context) -> {
+			NoSuchBeanDefinitionException exception = Assertions.assertThrows(NoSuchBeanDefinitionException.class, () -> {
+				context.getBean("jobExecutionEventsListener");
+			});
+			assertThat(exception.getMessage()).contains(
+					String.format("No bean named 'jobExecutionEventsListener' available"));
+		});
+	}
+
 	private void testDisabledConfiguration(String property, String disabledListener) {
 		String disabledPropertyArg = (property != null) ? "--" + property + "=false" : "";
 		ApplicationContextRunner applicationContextRunner = new ApplicationContextRunner()