JobLauncherTestUtils doesn't always launch new job instance because generated job parameters aren't unique [BATCH-2783]

[spring-projects-issues]

saikatbhadra opened BATCH-2783 and commented

We noticed that our integration tests for a batch job (with many tests) were failing intermittently.  After debugging, I found that JobLauncherTestUtils.launchJob was occasionally relaunching the same job instance. After looking at the code, I saw that a random number generator was being used which does not guarantee that the number generate would be unique. I believe a UUID would be more appropriate as strongly guarantees that an ID does not repeat (except in highly exceptional cases). 

Pull request here: #3701

---

No further details from BATCH-2783

[fmbenhassine]

Resolved with #3701 .