Remove support for multiple batch jobs

Closes gh-25373

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

@@ -45,15 +45,14 @@
 import org.springframework.util.StringUtils;
 
 /**
- * {@link EnableAutoConfiguration Auto-configuration} for Spring Batch. By default a
- * Runner will be created and all jobs in the context will be executed on startup.
+ * {@link EnableAutoConfiguration Auto-configuration} for Spring Batch. If a single job is
+ * found in the context, it will be executed on startup.
  * <p>
  * Disable this behavior with {@literal spring.batch.job.enabled=false}).
  * <p>
- * Alternatively, discrete Job names to execute on startup can be supplied by the User
- * with a comma-delimited list: {@literal spring.batch.job.names=job1,job2}. In this case
- * the Runner will first find jobs registered as Beans, then those in the existing
- * JobRegistry.
+ * If multiple jobs are found, a job name to execute on startup can be supplied by the
+ * User with : {@literal spring.batch.job.name=job1}. In this case the Runner will first
+ * find jobs registered as Beans, then those in the existing JobRegistry.
  *
  * @author Dave Syer
  * @author Eddú Meléndez
@@ -74,9 +73,9 @@ public class BatchAutoConfiguration {
 	public JobLauncherApplicationRunner jobLauncherApplicationRunner(JobLauncher jobLauncher, JobExplorer jobExplorer,
 			JobRepository jobRepository, BatchProperties properties) {
 		JobLauncherApplicationRunner runner = new JobLauncherApplicationRunner(jobLauncher, jobExplorer, jobRepository);
-		String jobNames = properties.getJob().getNames();
+		String jobNames = properties.getJob().getName();
 		if (StringUtils.hasText(jobNames)) {
-			runner.setJobNames(jobNames);
+			runner.setJobName(jobNames);
 		}
 		return runner;
 	}

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

@@ -46,17 +46,17 @@ public Jdbc getJdbc() {
 	public static class Job {
 
 		/**
-		 * Comma-separated list of job names to execute on startup (for instance,
-		 * 'job1,job2'). By default, all Jobs found in the context are executed.
+		 * Job name to execute on startup. Must be specified if multiple Jobs are found in
+		 * the context.
 		 */
-		private String names = "";
+		private String name = "";
 
-		public String getNames() {
-			return this.names;
+		public String getName() {
+			return this.name;
 		}
 
-		public void setNames(String names) {
-			this.names = names;
+		public void setName(String name) {
+			this.name = name;
 		}
 
 	}

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

@@ -24,6 +24,7 @@
 import java.util.Map;
 import java.util.Properties;
 
+import jakarta.annotation.PostConstruct;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -53,7 +54,6 @@
 import org.springframework.core.Ordered;
 import org.springframework.core.log.LogMessage;
 import org.springframework.util.Assert;
-import org.springframework.util.PatternMatchUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -86,7 +86,7 @@ public class JobLauncherApplicationRunner implements ApplicationRunner, Ordered,
 
 	private JobRegistry jobRegistry;
 
-	private String jobNames;
+	private String jobName;
 
 	private Collection<Job> jobs = Collections.emptySet();
 
@@ -110,6 +110,13 @@ public JobLauncherApplicationRunner(JobLauncher jobLauncher, JobExplorer jobExpl
 		this.jobRepository = jobRepository;
 	}
 
+	@PostConstruct
+	public void validate() {
+		if (this.jobs.size() > 1 && !StringUtils.hasText(this.jobName)) {
+			throw new IllegalArgumentException("Job name must be specified in case of multiple jobs");
+		}
+	}
+
 	public void setOrder(int order) {
 		this.order = order;
 	}
@@ -129,8 +136,8 @@ public void setJobRegistry(JobRegistry jobRegistry) {
 		this.jobRegistry = jobRegistry;
 	}
 
-	public void setJobNames(String jobNames) {
-		this.jobNames = jobNames;
+	public void setJobName(String jobName) {
+		this.jobName = jobName;
 	}
 
 	@Autowired(required = false)
@@ -162,9 +169,8 @@ protected void launchJobFromProperties(Properties properties) throws JobExecutio
 
 	private void executeLocalJobs(JobParameters jobParameters) throws JobExecutionException {
 		for (Job job : this.jobs) {
-			if (StringUtils.hasText(this.jobNames)) {
-				String[] jobsToRun = this.jobNames.split(",");
-				if (!PatternMatchUtils.simpleMatch(jobsToRun, job.getName())) {
+			if (StringUtils.hasText(this.jobName)) {
+				if (!this.jobName.equals(job.getName())) {
 					logger.debug(LogMessage.format("Skipped job: %s", job.getName()));
 					continue;
 				}
@@ -174,19 +180,15 @@ private void executeLocalJobs(JobParameters jobParameters) throws JobExecutionEx
 	}
 
 	private void executeRegisteredJobs(JobParameters jobParameters) throws JobExecutionException {
-		if (this.jobRegistry != null && StringUtils.hasText(this.jobNames)) {
-			String[] jobsToRun = this.jobNames.split(",");
-			for (String jobName : jobsToRun) {
-				try {
-					Job job = this.jobRegistry.getJob(jobName);
-					if (this.jobs.contains(job)) {
-						continue;
-					}
+		if (this.jobRegistry != null && StringUtils.hasText(this.jobName)) {
+			try {
+				Job job = this.jobRegistry.getJob(this.jobName);
+				if (!this.jobs.contains(job)) {
 					execute(job, jobParameters);
 				}
-				catch (NoSuchJobException ex) {
-					logger.debug(LogMessage.format("No job found in registry for job name: %s", jobName));
-				}
+			}
+			catch (NoSuchJobException ex) {
+				logger.debug(LogMessage.format("No job found in registry for job name: %s", this.jobName));
 			}
 		}
 	}