Support for bare double dash in argument parsing with SimpleCommandLineArgsParser [SPR-17416]

[spring-issuemaster]

Phil Webb opened SPR-17416 and commented

Originally raise as a Spring Boot issue:

I would like Spring Boot application to support guideline 10 of POSIX.1-2017 - Utility argument convention section:

| The first -- argument that is not an option-argument should be accepted as a delimiter indicating the end of options. Any following arguments should be treated as operands, even if they begin with the '-' character.

The desired behavior is to recognize the -- and leave all the arguments to the right of it alone.

Just for context: in 2.0.x passing -- to a SpringBoot application results in an error (sample trace below). The double dash is treated as an invalid option (whose name is zero-length) and there seems to be no way to configure this behavior.

java.lang.IllegalArgumentException: Invalid argument syntax: --
	at org.springframework.core.env.SimpleCommandLineArgsParser.parse(SimpleCommandLineArgsParser.java:75)
	at org.springframework.core.env.SimpleCommandLinePropertySource.<init>(SimpleCommandLinePropertySource.java:90)
	at org.springframework.boot.DefaultApplicationArguments$Source.<init>(DefaultApplicationArguments.java:76)
	at org.springframework.boot.DefaultApplicationArguments.<init>(DefaultApplicationArguments.java:42)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:321)
	at com.netflix.genie.GenieAgentApplication.run(GenieAgentApplication.java:63)

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Reference URL: spring-projects/spring-boot#14909