Q: main not available

[grkuntzmd]

I'm a Groovy-Newbie.

If I run the following program using "groovy Main.groovy", it runs fine. If I compile it and type "java Main" I get the following error:

Exception in thread "main" java.lang.NoSuchMethodError: main

--- cut here ---

#!/usr/bin/env groovy

class Main {
    static main(args) {
        println System.getProperty("java.version")
    }
}

--- cut here ---

Any ideas?

BTW, If I change to "static void main(String[] args)" it works in both, so I guess I can type a few extra characters.

[Martin Stephan]

Hi

try: public static void main(def args)

On Wed, Aug 13, 2008 at 7:30 PM, grkuntzmd <grk@...> wrote:

I'm a Groovy-Newbie.

If I run the following program using "groovy Main.groovy", it runs fine. If I compile it and type "java Main" I get the following error:

Exception in thread "main" java.lang.NoSuchMethodError: main

--- cut here ---

#!/usr/bin/env groovy

class Main {
    static main(args) {
        println System.getProperty("java.version")
    }
}

--- cut here ---

Any ideas?

BTW, If I change to "static void main(String[] args)" it works in both, so I guess I can type a few extra characters.

---

View this message in context: Q: main not available
Sent from the groovy - user mailing list archive at Nabble.com.

[Chris Reeves-3]

Exactly. The minimum signature that java will see is

static void main(args) {
}

Thanks, Chris

On Wednesday 13 August 2008 13:33:38 Martin Stephan wrote:

> Hi
>
> try: public static void main(def args)
>
> On Wed, Aug 13, 2008 at 7:30 PM, grkuntzmd <grk@...> wrote:
> > I'm a Groovy-Newbie.
> >
> > If I run the following program using "groovy Main.groovy", it runs fine.
> > If I compile it and type "java Main" I get the following error:
> >
> > Exception in thread "main" java.lang.NoSuchMethodError: main
> >
> > --- cut here ---
> >
> > #!/usr/bin/env groovy
> >
> > class Main {
> >     static main(args) {
> >         println System.getProperty("java.version")
> >     }
> > }
> >
> > --- cut here ---
> >
> > Any ideas?
> >
> > BTW, If I change to "static void main(String[] args)" it works in both,
> > so I guess I can type a few extra characters.
> > ------------------------------
> > View this message in context: Q: main not
> > available<http://www.nabble.com/Q%3A-main-not-available-tp18967677p189676
> >77.html> Sent from the groovy - user mailing list
> > archive<http://www.nabble.com/groovy---user-f11867.html>at Nabble.com.

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[grkuntzmd]

I tried

#!/usr/bin/env groovy

static main(def args) {
    println System.getProperty("java.version")
}

and using "groovy Main.groovy" it printed "1.6.0_10-rc" and with "java Main", nothing (no error though).

[Jochen Theodorou]

Chris Reeves schrieb:
> Exactly. The minimum signature that java will see is
>
> static void main(args) {
> }

the minimum signature varies from tool to tool. Some tools look for
exactly "static void main(String[])", others are satisfied if there is a
"static main(args)", but maybe the java command requires "static void
main(args)". For the Groovy command the minimal form should be ok.

bye blackdrag

--
Jochen "blackdrag" Theodorou
The Groovy Project Tech Lead (http://groovy.codehaus.org)
http://blackdragsview.blogspot.com/
http://www.g2one.com/

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[Chris Reeves-3]

To be specific, Sun Java 1.6.0_06 java command on linux requires at least that
signature. I would think the same jre on other platforms would be the same,
but icedtea, et al are probably a little bit different even on the same
platform.

Thanks, Chris

On Wednesday 13 August 2008 14:29:20 Jochen Theodorou wrote:

> Chris Reeves schrieb:
> > Exactly. The minimum signature that java will see is
> >
> > static void main(args) {
> > }
>
> the minimum signature varies from tool to tool. Some tools look for
> exactly "static void main(String[])", others are satisfied if there is a
> "static main(args)", but maybe the java command requires "static void
> main(args)". For the Groovy command the minimal form should be ok.
>
> bye blackdrag

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