How do I pass arguments to a Groovy 2.0 script?

groovy

Solution

Hello is looking for a string array in the binding called `args`. This is automatically provided to you when you run the script via the command line, but if you are running it outside of that context, you must add it to the `Binding` yourself:

This will pass the arguments sent to `Test` through to `Hello` as-is:

public class Test {
    public static void main(String[] args) {
        Binding b = new Binding()
        b.setVariable("args", args)
        Hello h = new Hello(b);
        h.run()
    }
}

If you want to send specific arguments, you must construct the array yourself:

public class Test {
    public static void main(String[] args) {
        Binding b = new Binding()
        b.setVariable("args", ["arg1", "arg2", "etc."])
        Hello h = new Hello(b)
        h.run()
    }
}

Problem

I have 2 scripts, where I am trying to test passing an argument, and it fails. I examined the documentation for GroovyScriptEngine but it doesn't seem to handle the case where I want to pass a arg rather than a property value pair (in a binding). Here is the error I get: ``` C:\AeroFS\Work\Groovy_Scripts>groovy scriptengineexample.groovy hello, world Caught: groovy.lang.MissingPropertyException: No such property: args for class: hello groovy.lang.MissingPropertyException: No such property: args for class: hello at hello.run(hello.groovy:4) at Test.main(scriptengineexample.groovy:14) ``` Here are my scripts: ``` import groovy.lang.Binding; import groovy.util.GroovyScriptEngine; import groovy.util.ResourceException ; import groovy.util.ScriptException ; import java.io.IOException ; public class Test { public static void main( String[] args ) throws IOException, ResourceException, ScriptException { GroovyScriptEngine gse = new GroovyScriptEngine( [ '.' ] as String[] ) Binding binding = new Binding(); binding.setVariable("input", "world"); gse.run("hello.groovy", binding); System.out.println( "Output: " + binding.getVariable("output") ); } } ``` And this one: ``` //hello.groovy println "hello.groovy" for (arg in this.args ) { println "Argument:" + arg; } ```

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