Retain as much Batch auto-config as possible without Spring JDBC

Closes gh-17451

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfiguration.java

@@ -39,7 +39,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.io.ResourceLoader;
-import org.springframework.jdbc.core.JdbcOperations;
+import org.springframework.jdbc.datasource.init.DatabasePopulator;
 import org.springframework.util.StringUtils;
 
 /**
@@ -60,37 +60,20 @@ import org.springframework.util.StringUtils;
  * @since 1.0.0
  */
 @Configuration
-@ConditionalOnClass({ JobLauncher.class, DataSource.class, JdbcOperations.class })
+@ConditionalOnClass({ JobLauncher.class, DataSource.class })
 @AutoConfigureAfter(HibernateJpaAutoConfiguration.class)
 @ConditionalOnBean(JobLauncher.class)
 @EnableConfigurationProperties(BatchProperties.class)
 @Import(BatchConfigurerConfiguration.class)
 public class BatchAutoConfiguration {
 
-	private final BatchProperties properties;
-
-	private final JobParametersConverter jobParametersConverter;
-
-	public BatchAutoConfiguration(BatchProperties properties,
-			ObjectProvider<JobParametersConverter> jobParametersConverter) {
-		this.properties = properties;
-		this.jobParametersConverter = jobParametersConverter.getIfAvailable();
-	}
-
-	@Bean
-	@ConditionalOnMissingBean
-	@ConditionalOnBean(DataSource.class)
-	public BatchDataSourceInitializer batchDataSourceInitializer(DataSource dataSource, ResourceLoader resourceLoader) {
-		return new BatchDataSourceInitializer(dataSource, resourceLoader, this.properties);
-	}
-
 	@Bean
 	@ConditionalOnMissingBean
 	@ConditionalOnProperty(prefix = "spring.batch.job", name = "enabled", havingValue = "true", matchIfMissing = true)
 	public JobLauncherCommandLineRunner jobLauncherCommandLineRunner(JobLauncher jobLauncher, JobExplorer jobExplorer,
-			JobRepository jobRepository) {
+			JobRepository jobRepository, BatchProperties properties) {
 		JobLauncherCommandLineRunner runner = new JobLauncherCommandLineRunner(jobLauncher, jobExplorer, jobRepository);
-		String jobNames = this.properties.getJob().getNames();
+		String jobNames = properties.getJob().getNames();
 		if (StringUtils.hasText(jobNames)) {
 			runner.setJobNames(jobNames);
 		}
@@ -106,16 +89,28 @@ public class BatchAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean(JobOperator.class)
 	public SimpleJobOperator jobOperator(JobExplorer jobExplorer, JobLauncher jobLauncher,
-			ListableJobLocator jobRegistry, JobRepository jobRepository) throws Exception {
+			ListableJobLocator jobRegistry, JobRepository jobRepository,
+			ObjectProvider<JobParametersConverter> jobParametersConverter) {
 		SimpleJobOperator factory = new SimpleJobOperator();
 		factory.setJobExplorer(jobExplorer);
 		factory.setJobLauncher(jobLauncher);
 		factory.setJobRegistry(jobRegistry);
 		factory.setJobRepository(jobRepository);
-		if (this.jobParametersConverter != null) {
-			factory.setJobParametersConverter(this.jobParametersConverter);
-		}
+		jobParametersConverter.ifAvailable(factory::setJobParametersConverter);
 		return factory;
 	}
 
+	@ConditionalOnBean(DataSource.class)
+	@ConditionalOnClass(DatabasePopulator.class)
+	static class DataSourceInitializerConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean
+		public BatchDataSourceInitializer batchDataSourceInitializer(DataSource dataSource,
+				ResourceLoader resourceLoader, BatchProperties properties) {
+			return new BatchDataSourceInitializer(dataSource, resourceLoader, properties);
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfigurationWithoutJdbcTests.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2012-2019 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
+ *
+ *      https://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.boot.autoconfigure.batch;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.batch.core.configuration.annotation.BatchConfigurer;
+import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
+import org.springframework.batch.core.explore.JobExplorer;
+import org.springframework.batch.core.launch.JobLauncher;
+import org.springframework.batch.core.launch.support.SimpleJobOperator;
+import org.springframework.batch.core.repository.JobRepository;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.testsupport.runner.classpath.ClassPathExclusions;
+import org.springframework.boot.testsupport.runner.classpath.ModifiedClassPathRunner;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.transaction.PlatformTransactionManager;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link BatchAutoConfiguration} when Spring JDBC is not on the classpath.
+ *
+ * @author Andy Wilkinson
+ */
+@RunWith(ModifiedClassPathRunner.class)
+@ClassPathExclusions("spring-jdbc-*.jar")
+public class BatchAutoConfigurationWithoutJdbcTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(BatchAutoConfiguration.class, TransactionAutoConfiguration.class))
+			.withUserConfiguration(BatchConfiguration.class);
+
+	@Test
+	public void whenThereIsNoJdbcOnTheClasspathThenComponentsAreStillAutoConfigured() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).hasSingleBean(JobLauncherCommandLineRunner.class);
+			assertThat(context).hasSingleBean(JobExecutionExitCodeGenerator.class);
+			assertThat(context).hasSingleBean(SimpleJobOperator.class);
+		});
+	}
+
+	@Configuration
+	@EnableBatchProcessing
+	static class BatchConfiguration implements BatchConfigurer {
+
+		@Override
+		public JobRepository getJobRepository() throws Exception {
+			return mock(JobRepository.class);
+		}
+
+		@Override
+		public PlatformTransactionManager getTransactionManager() throws Exception {
+			return mock(PlatformTransactionManager.class);
+		}
+
+		@Override
+		public JobLauncher getJobLauncher() throws Exception {
+			return mock(JobLauncher.class);
+		}
+
+		@Override
+		public JobExplorer getJobExplorer() throws Exception {
+			return mock(JobExplorer.class);
+		}
+
+	}
+
+}