Make use of Batch's new API for accessing job parameters

Closes gh-10135

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

@@ -19,22 +19,16 @@ package org.springframework.boot.autoconfigure.batch;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Properties;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import org.springframework.batch.core.BatchStatus;
 import org.springframework.batch.core.Job;
 import org.springframework.batch.core.JobExecution;
 import org.springframework.batch.core.JobExecutionException;
-import org.springframework.batch.core.JobInstance;
-import org.springframework.batch.core.JobParameter;
 import org.springframework.batch.core.JobParameters;
-import org.springframework.batch.core.JobParametersIncrementer;
+import org.springframework.batch.core.JobParametersBuilder;
 import org.springframework.batch.core.JobParametersInvalidException;
 import org.springframework.batch.core.configuration.JobRegistry;
 import org.springframework.batch.core.converter.DefaultJobParametersConverter;
@@ -124,66 +118,6 @@ public class JobLauncherCommandLineRunner
 		executeRegisteredJobs(jobParameters);
 	}
 
-	private JobParameters getNextJobParameters(Job job,
-			JobParameters additionalParameters) {
-		String name = job.getName();
-		JobParameters parameters = new JobParameters();
-		List<JobInstance> lastInstances = this.jobExplorer.getJobInstances(name, 0, 1);
-		JobParametersIncrementer incrementer = job.getJobParametersIncrementer();
-		Map<String, JobParameter> additionals = additionalParameters.getParameters();
-		if (lastInstances.isEmpty()) {
-			// Start from a completely clean sheet
-			if (incrementer != null) {
-				parameters = incrementer.getNext(new JobParameters());
-			}
-		}
-		else {
-			List<JobExecution> previousExecutions = this.jobExplorer
-					.getJobExecutions(lastInstances.get(0));
-			JobExecution previousExecution = previousExecutions.get(0);
-			if (previousExecution == null) {
-				// Normally this will not happen - an instance exists with no executions
-				if (incrementer != null) {
-					parameters = incrementer.getNext(new JobParameters());
-				}
-			}
-			else if (isStoppedOrFailed(previousExecution) && job.isRestartable()) {
-				// Retry a failed or stopped execution
-				parameters = previousExecution.getJobParameters();
-				// Non-identifying additional parameters can be removed to a retry
-				removeNonIdentifying(additionals);
-			}
-			else if (incrementer != null) {
-				// New instance so increment the parameters if we can
-				parameters = incrementer.getNext(previousExecution.getJobParameters());
-			}
-		}
-		return merge(parameters, additionals);
-	}
-
-	private boolean isStoppedOrFailed(JobExecution execution) {
-		BatchStatus status = execution.getStatus();
-		return (status == BatchStatus.STOPPED || status == BatchStatus.FAILED);
-	}
-
-	private void removeNonIdentifying(Map<String, JobParameter> parameters) {
-		HashMap<String, JobParameter> copy = new HashMap<>(parameters);
-		for (Map.Entry<String, JobParameter> parameter : copy.entrySet()) {
-			if (!parameter.getValue().isIdentifying()) {
-				parameters.remove(parameter.getKey());
-			}
-		}
-	}
-
-	private JobParameters merge(JobParameters parameters,
-			Map<String, JobParameter> additionals) {
-		Map<String, JobParameter> merged = new HashMap<>();
-		merged.putAll(parameters.getParameters());
-		merged.putAll(additionals);
-		parameters = new JobParameters(merged);
-		return parameters;
-	}
-
 	private void executeRegisteredJobs(JobParameters jobParameters)
 			throws JobExecutionException {
 		if (this.jobRegistry != null && StringUtils.hasText(this.jobNames)) {
@@ -208,7 +142,8 @@ public class JobLauncherCommandLineRunner
 			throws JobExecutionAlreadyRunningException, JobRestartException,
 			JobInstanceAlreadyCompleteException, JobParametersInvalidException,
 			JobParametersNotFoundException {
-		JobParameters nextParameters = getNextJobParameters(job, jobParameters);
+		JobParameters nextParameters = new JobParametersBuilder(jobParameters, this.jobExplorer)
+				.getNextJobParameters(job).toJobParameters();
 		if (nextParameters != null) {
 			JobExecution execution = this.jobLauncher.run(job, nextParameters);
 			if (this.publisher != null) {