CODEWITHSUNDEEP
javagroovyjarcommand-line-argumentssystem-properties
IAmYourFaja
IAmYourFaja

Reputation: 56912

How to pass an array arg to a Groovy JAR from command line?

My Groovy app has the following code:

def doSomething() {
    def props = [
        "fizz",
        "buzz"
    ]

    // Do something with 'props'...
}

Please note that props could grow quite long (10+ elements) over time.

I now want to read props from a switch at the command line (so, as System properties). So I'd like my code to be something like this:

def doSomething() {
    def props = System.getProperty("props")

    // Do something with 'props'...
}

So I could then run the app via:

java -Dprops=??? -jar myapp.jar

But now sure how to specify an array of Strings from the command line. Any ideas?

Upvotes: 4

Views: 1591

Answers (3)

Dilbert
Dilbert

Reputation: 1

Have you thought about using a property file and using ConfigSlurper e.g. something like

File configFile = new File(configDir, 'config.groovy')
ConfigObject config = new ConfigSlurper().parse(configFile.toURI().toURL())
def props = config.props

where config.groovy looks like

props = ["fizz","buzz","etc"]

Or using CliBuilder to pass command line args

e.g. something like

CliBuilder cli = new CliBuilder(usage: "blah:")
cli.p(argName: 'prop', longOpt: 'prop', args: Option.UNLIMITED_VALUES, required: true, valueSeparator: ',', '')
def options = cli.parse(args)
def props = options.ps // ps gives you all the -p args

then 

java -jar myapp.jar -p fizz,buzz,etc
or alternate allowed syntax
java -jar myapp.jar -p fizz -p buzz -p etc

Upvotes: 0

user987339
user987339

Reputation: 10707

As you said, there is no built in support but you can try this:

 ArrayList props = System.getProperty("props").replaceAll("\\[","").replaceAll("]","").split(",")

and call it with:

java -Dprops="['fizz','buzz']" -jar myapp.jar

Upvotes: 3

IAmYourFaja
IAmYourFaja

Reputation: 56912

There doesn't seem to be built-in support for this, so I ended up going with:

System.getProperty("props").split(";")

Then from the command-line:

java -Dprops="fizz;buzz;etc" -jar myapp.jar

Upvotes: 3

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