Fix job execution validation in SimpleJobRepository

Before this commit, the logic that validates if a job
instance is complete or not was based only on the size
of previous parameters, without checking if they are
identifying or not.

This commit introduces a change that uses only
identifying job parameters to identify a job instance
and validate its previous executions.

Issue #1221

spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/SimpleJobRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2020 the original author or authors.
+ * Copyright 2006-2021 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.
@@ -21,6 +21,7 @@
 import org.springframework.batch.core.BatchStatus;
 import org.springframework.batch.core.JobExecution;
 import org.springframework.batch.core.JobInstance;
+import org.springframework.batch.core.JobParameter;
 import org.springframework.batch.core.JobParameters;
 import org.springframework.batch.core.StepExecution;
 import org.springframework.batch.core.repository.JobExecutionAlreadyRunningException;
@@ -132,7 +133,9 @@ public JobExecution createJobExecution(String jobName, JobParameters jobParamete
 							+ "The last execution ended with a failure that could not be rolled back, "
 							+ "so it may be dangerous to proceed. Manual intervention is probably necessary.");
 				}
-				if (execution.getJobParameters().getParameters().size() > 0 && (status == BatchStatus.COMPLETED || status == BatchStatus.ABANDONED)) {
+				Collection<JobParameter> allJobParameters = execution.getJobParameters().getParameters().values();
+				long identifyingJobParametersCount = allJobParameters.stream().filter(JobParameter::isIdentifying).count();
+				if (identifyingJobParametersCount > 0 && (status == BatchStatus.COMPLETED || status == BatchStatus.ABANDONED)) {
 					throw new JobInstanceAlreadyCompleteException(
 							"A job instance already exists and is complete for parameters=" + jobParameters
 							+ ".  If you want to run this job again, change the parameters.");

spring-batch-core/src/test/java/org/springframework/batch/core/repository/support/SimpleJobRepositoryIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2018 the original author or authors.
+ * Copyright 2008-2021 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.
@@ -44,6 +44,7 @@
  *
  * @author Robert Kasanicky
  * @author Dimitrios Liapis
+ * @author Mahmoud Ben Hassine
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(locations = "/org/springframework/batch/core/repository/dao/sql-dao-test.xml")
@@ -212,4 +213,23 @@ public void testGetLastJobExecution() throws Exception {
 		assertEquals(stepExecution, jobExecution.getStepExecutions().iterator().next());
 	}
 
+	/*
+	 * Create two job executions for the same job+parameters tuple. Should ignore
+	 * non-identifying job parameters when identifying the job instance.
+	 */
+	@Transactional
+	@Test
+	public void testReExecuteWithSameJobParameters() throws Exception {
+		JobParameters jobParameters = new JobParametersBuilder()
+				.addString("name", "foo", false)
+				.toJobParameters();
+		JobExecution jobExecution1 = jobRepository.createJobExecution(job.getName(), jobParameters);
+		jobExecution1.setStatus(BatchStatus.COMPLETED);
+		jobExecution1.setEndTime(new Date());
+		jobRepository.update(jobExecution1);
+		JobExecution jobExecution2 = jobRepository.createJobExecution(job.getName(), jobParameters);
+		assertNotNull(jobExecution1);
+		assertNotNull(jobExecution2);
+	}
+
 }