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https://issues.apache.org/jira/browse/GROOVY-9599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Remko Popma resolved GROOVY-9599.
---------------------------------
Resolution: Fixed
> CliBuilder: Option with "type: String, defaultValue ''" (empty String)
> results in NullObject if default value is applied
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-9599
> URL: https://issues.apache.org/jira/browse/GROOVY-9599
> Project: Groovy
> Issue Type: Bug
> Components: command line processing
> Affects Versions: 2.5.11, 3.0.4
> Reporter: Remko Popma
> Assignee: Remko Popma
> Priority: Major
> Fix For: 3.0.5, 2.5.13
>
>
> This is a follow-up ticket for GROOVY-9519:
> After checking with Groovy 3.0.4, it seems that only the "Integer with
> defaultValue '0'" case was fixed, but not "String with defaultValue ''". The
> latter became even worse. It still ignores the defaultValue, but instead of
> creating a Boolean, it now creates a NullObject. Try this code:
> {code:java}
> @Grab('info.picocli:picocli-groovy:4.3.2')
> @GrabConfig(systemClassLoader=true)
> import groovy.cli.picocli.CliBuilder
> def cli = new CliBuilder(name: 'cliTest.groovy', stopAtNonOption: false)
> cli.h(type: Boolean, longOpt: 'help', usageHelp: true, required: false, 'Show
> usage information')
> cli.a(type: String, longOpt: 'optA', required: false, args: 1, defaultValue:
> '', 'Option a (optional)')
> def opts = cli.parse(args)
> opts || System.exit(1)
> if(opts.h) {
> cli.usage()
> System.exit(0)
> }
> println(opts.a.getClass())
> if (opts.a) {
> println(opts.a)
> }
> {code}
> with Groovy 3.0.2:
> {code:java}
> % ~/tmp/groovy-3.0.2/bin/groovy ./cliTest.groovy
> class java.lang.Boolean
> {code}
> and with Groovy 3.0.4:
> {code:java}
> % ~/tmp/groovy-3.0.4/bin/groovy ./cliTest.groovy
> class org.codehaus.groovy.runtime.NullObject
> {code}
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