For example you work with Spring Boot + Spring Batch and you need to validate command line arguments as JobParameters in batch job. By default Spring Boot uses SimpleCommandLinePropertySource to resolve Environment parameters. This PropertySource implementation recognize --optName[=optValue] as argument with name optName and value optValue. On the other hand Spring Batch provides DefaultJobParametersConverter to resolve job parameters. This converter recognize --optName[=optValue] as non-identifying argument with name -optName and value optValue. And if you want to use JobParametersValidator to validate requred and optional keys in JobParameters you need to check for -optName rather then optName. Or implement custom JobParametersConverter which will detect these arguments right. This functionality is pretty common but there are no JIRA features or discussions in mailing lists. This commit is to expose SimpleCommandLineArgsParser methods and extract fields for -- and = to implement SimpleCommandLineJobParametersConverter in Spring Batch project.

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Comment From: snicoll

Thanks for the PR and sorry it took so long to get back to you.

I believe this problem has been fixed as part of https://github.com/spring-projects/spring-boot/issues/19442. If you think otherwise or need more flexibility, I suggest to open a new issue in the Spring Boot project that describes your problem in more details. A small sample that we can run ourselves as a zip attached to the issue would be ideal.