Which IDE works ATM for Scala 2.8?

in the meantime, a very urgent request for help: at this moment, all
i get when launching my application is

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

this also happens from the terminal, using

$ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages

the main class _is there_ (e.g. bin/de/sciss/tint/nuages/Nuages.class
exists) , so this got compiled:

package de.sciss.tint.nuages

import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
import _root_.java.awt.{ EventQueue }
import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
import _root_.javax.swing.{ JFrame, WindowConstants }

object Nuages {
def main( args : Array[ String ]) {
EventQueue.invokeLater( new Runnable { def run = new Nuages })
}
}

class Nuages { .... }

so don't understand the problem. fifteen minutes ago it was launching.

hell.........

thanks, -sciss-

Am 18.07.2009 um 22:27 schrieb Sciss:

> hi,
>
> i urgently need to work on a Scala 2.8 project (i guess it was a
> mistake to start using 2.8, since despite middle of july there are
> no signs of the promised preview, but now everything is full of
> default and named args, so no way back.....). the eclipse plug-in
> ist still hopelessly broken and a PITA. anyone knows if it's
> possible to work with idea or netbeans on an 2.8 project?
>
> thanks, -sciss-
>

after opening java perspective, then again scala perspective, it
launches again. don't know what was the reason.... ;o/ i hope this
stays a little stable...

Am 18.07.2009 um 22:52 schrieb Sciss:

> in the meantime, a very urgent request for help: at this moment,
> all i get when launching my application is
>
> Exception in thread "main" java.lang.NoSuchMethodError: main
>
> this also happens from the terminal, using
>
> $ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages
>
> the main class _is there_ (e.g. bin/de/sciss/tint/nuages/
> Nuages.class exists) , so this got compiled:
>
> package de.sciss.tint.nuages
>
> import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
> import _root_.java.awt.{ EventQueue }
> import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
> import _root_.javax.swing.{ JFrame, WindowConstants }
>
> object Nuages {
> def main( args : Array[ String ]) {
> EventQueue.invokeLater( new Runnable { def run = new Nuages })
> }
> }
>
> class Nuages { .... }
>
>
> so don't understand the problem. fifteen minutes ago it was launching.
>
> hell.........
>
> thanks, -sciss-
>
>
>
> Am 18.07.2009 um 22:27 schrieb Sciss:
>
>> hi,
>>
>> i urgently need to work on a Scala 2.8 project (i guess it was a
>> mistake to start using 2.8, since despite middle of july there are
>> no signs of the promised preview, but now everything is full of
>> default and named args, so no way back.....). the eclipse plug-in
>> ist still hopelessly broken and a PITA. anyone knows if it's
>> possible to work with idea or netbeans on an 2.8 project?
>>
>> thanks, -sciss-
>>
>

Do not make your main-containing object have a companion class. That
annoyingly suppresses the generation of static methods, such as main.

2009/7/18 Sciss :
> in the meantime, a very urgent request for help: at this moment, all i get
> when launching my application is
>
>        Exception in thread "main" java.lang.NoSuchMethodError: main
>
> this also happens from the terminal, using
>
> $ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages
>
> the main class _is there_ (e.g. bin/de/sciss/tint/nuages/Nuages.class
> exists) , so this got compiled:
>
>        package de.sciss.tint.nuages
>
>        import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
>        import _root_.java.awt.{ EventQueue }
>        import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
>        import _root_.javax.swing.{ JFrame, WindowConstants }
>
>        object Nuages {
>                def main( args : Array[ String ]) {
>                        EventQueue.invokeLater( new Runnable { def run = new
> Nuages })
>                }
>        }
>
>        class Nuages { .... }
>
>
> so don't understand the problem. fifteen minutes ago it was launching.
>
> hell.........
>
> thanks, -sciss-
>
>
>
> Am 18.07.2009 um 22:27 schrieb Sciss:
>
>> hi,
>>
>> i urgently need to work on a Scala 2.8 project (i guess it was a mistake
>> to start using 2.8, since despite middle of july there are no signs of the
>> promised preview, but now everything is full of default and named args, so
>> no way back.....). the eclipse plug-in ist still hopelessly broken and a
>> PITA. anyone knows if it's possible to work with idea or netbeans on an 2.8
>> project?
>>
>> thanks, -sciss-
>>
>
>

i intuitively guessed that when i renamed Nuages (class) to something
else, so that really fixed it. is this a known bug? i mean coming
from java, the first thing you do in a GUI application is you
instantiate the main class... this would be a common trap i think.

thanks for the hint! ciao, -sciss-

Am 18.07.2009 um 23:47 schrieb Ricky Clarkson:

> Do not make your main-containing object have a companion class. That
> annoyingly suppresses the generation of static methods, such as main.
>
> 2009/7/18 Sciss :
>> in the meantime, a very urgent request for help: at this moment,
>> all i get
>> when launching my application is
>>
>> Exception in thread "main" java.lang.NoSuchMethodError: main
>>
>> this also happens from the terminal, using
>>
>> $ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages
>>
>> the main class _is there_ (e.g. bin/de/sciss/tint/nuages/Nuages.class
>> exists) , so this got compiled:
>>
>> package de.sciss.tint.nuages
>>
>> import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
>> import _root_.java.awt.{ EventQueue }
>> import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
>> import _root_.javax.swing.{ JFrame, WindowConstants }
>>
>> object Nuages {
>> def main( args : Array[ String ]) {
>> EventQueue.invokeLater( new Runnable { def
>> run = new
>> Nuages })
>> }
>> }
>>
>> class Nuages { .... }
>>
>>
>> so don't understand the problem. fifteen minutes ago it was
>> launching.
>>
>> hell.........
>>
>> thanks, -sciss-
>>
>>
>>
>> Am 18.07.2009 um 22:27 schrieb Sciss:
>>
>>> hi,
>>>
>>> i urgently need to work on a Scala 2.8 project (i guess it was a
>>> mistake
>>> to start using 2.8, since despite middle of july there are no
>>> signs of the
>>> promised preview, but now everything is full of default and named
>>> args, so
>>> no way back.....). the eclipse plug-in ist still hopelessly
>>> broken and a
>>> PITA. anyone knows if it's possible to work with idea or netbeans
>>> on an 2.8
>>> project?
>>>
>>> thanks, -sciss-
>>>
>>
>>
>
>
>

It's known, and not a bug, as such, and as such it's not a bug.

class X {
def foo = 5
}

object X {
def foo = 10
}

This generates .class files that decompile to the following Java, roughly:

public class X {
public int foo() {
return 5;
}
}

public class X$ {
public static final X$ MODULE$ = new X$();

public int foo() {
return 10;
}
}

If scalac generated a static forwarder, X.class would theoretically
decompile to:

public class X {
public int foo() {
return 5;
}
public static int foo() {
return X$.MODULE$.foo();
}
}

But that's invalid Java; you can't overload when a method only differs
from another by whether it's static. Class files have the same
restriction. So Scala refuses to generate any static forwarders for a
companion object, to avoid nasty surprises. It's arguably overly
conservative though, and I'd love to see this improved.

2009/7/18 Sciss :
> i intuitively guessed that when i renamed Nuages (class) to something else,
> so that really fixed it. is this a known bug? i mean coming from java, the
> first thing you do in a GUI application is you instantiate the main class...
> this would be a common trap i think.
>
> thanks for the hint!   ciao, -sciss-
>
>
> Am 18.07.2009 um 23:47 schrieb Ricky Clarkson:
>
>> Do not make your main-containing object have a companion class.  That
>> annoyingly suppresses the generation of static methods, such as main.
>>
>> 2009/7/18 Sciss :
>>>
>>> in the meantime, a very urgent request for help: at this moment, all i
>>> get
>>> when launching my application is
>>>
>>>       Exception in thread "main" java.lang.NoSuchMethodError: main
>>>
>>> this also happens from the terminal, using
>>>
>>> $ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages
>>>
>>> the main class _is there_ (e.g. bin/de/sciss/tint/nuages/Nuages.class
>>> exists) , so this got compiled:
>>>
>>>       package de.sciss.tint.nuages
>>>
>>>       import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
>>>       import _root_.java.awt.{ EventQueue }
>>>       import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
>>>       import _root_.javax.swing.{ JFrame, WindowConstants }
>>>
>>>       object Nuages {
>>>               def main( args : Array[ String ]) {
>>>                       EventQueue.invokeLater( new Runnable { def run =
>>> new
>>> Nuages })
>>>               }
>>>       }
>>>
>>>       class Nuages { .... }
>>>
>>>
>>> so don't understand the problem. fifteen minutes ago it was launching.
>>>
>>> hell.........
>>>
>>> thanks, -sciss-
>>>
>>>
>>>
>>> Am 18.07.2009 um 22:27 schrieb Sciss:
>>>
>>>> hi,
>>>>
>>>> i urgently need to work on a Scala 2.8 project (i guess it was a mistake
>>>> to start using 2.8, since despite middle of july there are no signs of
>>>> the
>>>> promised preview, but now everything is full of default and named args,
>>>> so
>>>> no way back.....). the eclipse plug-in ist still hopelessly broken and a
>>>> PITA. anyone knows if it's possible to work with idea or netbeans on an
>>>> 2.8
>>>> project?
>>>>
>>>> thanks, -sciss-
>>>>
>>>
>>>
>>
>>
>>
>> --
>> Ricky Clarkson
>> Java Programmer, AD Holdings
>> +44 1565 770804
>> Skype: ricky_clarkson
>> Google Talk: ricky.clarkson@gmail.com
>
>

Actually it is a bug that it doesn't generate forwarders where there
are no conflicts, and two attempts to solve it have caused problems
elsewhere and thus been reverted:
https://lampsvn.epfl.ch/trac/scala/ticket/1735

Thanks to Paul for pointing that out. Smoke signals say that the
reasons for those problems have been identified recently.

2009/7/18 Ricky Clarkson :
> It's known, and not a bug, as such, and as such it's not a bug.
>
> class X {
>  def foo = 5
> }
>
> object X {
>  def foo = 10
> }
>
> This generates .class files that decompile to the following Java, roughly:
>
> public class X {
>    public int foo() {
>        return 5;
>    }
> }
>
> public class X$ {
>    public static final X$ MODULE$ = new X$();
>
>    public int foo() {
>        return 10;
>    }
> }
>
> If scalac generated a static forwarder, X.class would theoretically
> decompile to:
>
> public class X {
>    public int foo() {
>        return 5;
>    }
>    public static int foo() {
>        return X$.MODULE$.foo();
>    }
> }
>
> But that's invalid Java; you can't overload when a method only differs
> from another by whether it's static.  Class files have the same
> restriction.  So Scala refuses to generate any static forwarders for a
> companion object, to avoid nasty surprises.  It's arguably overly
> conservative though, and I'd love to see this improved.
>
> 2009/7/18 Sciss :
>> i intuitively guessed that when i renamed Nuages (class) to something else,
>> so that really fixed it. is this a known bug? i mean coming from java, the
>> first thing you do in a GUI application is you instantiate the main class...
>> this would be a common trap i think.
>>
>> thanks for the hint!   ciao, -sciss-
>>
>>
>> Am 18.07.2009 um 23:47 schrieb Ricky Clarkson:
>>
>>> Do not make your main-containing object have a companion class.  That
>>> annoyingly suppresses the generation of static methods, such as main.
>>>
>>> 2009/7/18 Sciss :
>>>>
>>>> in the meantime, a very urgent request for help: at this moment, all i
>>>> get
>>>> when launching my application is
>>>>
>>>>       Exception in thread "main" java.lang.NoSuchMethodError: main
>>>>
>>>> this also happens from the terminal, using
>>>>
>>>> $ java -cp bin:lib2/scala-library.jar de.sciss.tint.nuages.Nuages
>>>>
>>>> the main class _is there_ (e.g. bin/de/sciss/tint/nuages/Nuages.class
>>>> exists) , so this got compiled:
>>>>
>>>>       package de.sciss.tint.nuages
>>>>
>>>>       import _root_.de.sciss.tint.sc.{ Server, ServerOptions }
>>>>       import _root_.java.awt.{ EventQueue }
>>>>       import _root_.java.awt.event.{ WindowAdapter, WindowEvent }
>>>>       import _root_.javax.swing.{ JFrame, WindowConstants }
>>>>
>>>>       object Nuages {
>>>>               def main( args : Array[ String ]) {
>>>>                       EventQueue.invokeLater( new Runnable { def run =
>>>> new
>>>> Nuages })
>>>>               }
>>>>       }
>>>>
>>>>       class Nuages { .... }
>>>>
>>>>
>>>> so don't understand the problem. fifteen minutes ago it was launching.
>>>>
>>>> hell.........
>>>>
>>>> thanks, -sciss-
>>>>
>>>>
>>>>
>>>> Am 18.07.2009 um 22:27 schrieb Sciss:
>>>>
>>>>> hi,
>>>>>
>>>>> i urgently need to work on a Scala 2.8 project (i guess it was a mistake
>>>>> to start using 2.8, since despite middle of july there are no signs of
>>>>> the
>>>>> promised preview, but now everything is full of default and named args,
>>>>> so
>>>>> no way back.....). the eclipse plug-in ist still hopelessly broken and a
>>>>> PITA. anyone knows if it's possible to work with idea or netbeans on an
>>>>> 2.8
>>>>> project?
>>>>>
>>>>> thanks, -sciss-
>>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Ricky Clarkson
>>> Java Programmer, AD Holdings
>>> +44 1565 770804
>>> Skype: ricky_clarkson
>>> Google Talk: ricky.clarkson@gmail.com
>>
>>
>
>
>
> --
> Ricky Clarkson
> Java Programmer, AD Holdings
> +44 1565 770804
> Skype: ricky_clarkson
> Google Talk: ricky.clarkson@gmail.com
>

On Sat, 2009-07-18 at 23:58 +0100, Ricky Clarkson wrote:
> Actually it is a bug that it doesn't generate forwarders where there
> are no conflicts, and two attempts to solve it have caused problems
> elsewhere and thus been reverted:
> https://lampsvn.epfl.ch/trac/scala/ticket/1735

I think a better description would be to say that it's a missing feature
with an open ticket. :)

Ismael