dangerous import java.sql._

[turicum]

Hi everybody!

Yet another simple and mysterious problem: with the "import" statement, running the code will generate a "Exception in thread "main" java.lang.NoSuchMethodError: main". Removing the "import" solves the problem. What am I missing? Changing the name of the object does not modify the outcome. Thanks!

import java.sql._ // remove this line to get rid of the error msg

object Sqltest {
        def main(args: Array[String]) {
          print("OK")
        }
}

[Tony Morris-4]

I shan't spoil it for you, but I shall give ye a hint.

When one alters Array for the word scala.Array then all is well.

turicum wrote:

> Hi everybody!
>
> Yet another simple and mysterious problem: with the "import" statement,
> running the code will generate a "Exception in thread "main"
> java.lang.NoSuchMethodError: main". Removing the "import" solves the
> problem. What am I missing? Changing the name of the object does not modify
> the outcome. Thanks!
>
> import java.sql._ // remove this line to get rid of the error msg
>
> object Sqltest {
> def main(args: Array[String]) {
>  print("OK")
> }
> }
>
>
>  

--
Tony Morris
http://tmorris.net/

[turicum]

thank you for the prompt reply!
everything's fine now :)
Alex

Tony Morris-4 wrote:

I shan't spoil it for you, but I shall give ye a hint.

When one alters Array for the word scala.Array then all is well.

turicum wrote:
> Hi everybody!
>
> Yet another simple and mysterious problem: with the "import" statement,
> running the code will generate a "Exception in thread "main"
> java.lang.NoSuchMethodError: main". Removing the "import" solves the
> problem. What am I missing? Changing the name of the object does not modify
> the outcome. Thanks!
>
> import java.sql._ // remove this line to get rid of the error msg
>
> object Sqltest {
> def main(args: Array[String]) {
>  print("OK")
> }
> }
>
>
>  

--
Tony Morris
http://tmorris.net/

[Tony Morris-4]

Good job, then we shall reveal the problem for all!

The import causes the main method to use java.sql.Array thus making it
an invalid main method for execution.

turicum wrote:

> thank you for the prompt reply!
> everything's fine now :)
> Alex
>
>
> Tony Morris-4 wrote:
>  
>> I shan't spoil it for you, but I shall give ye a hint.
>>
>> When one alters Array for the word scala.Array then all is well.
>>
>> turicum wrote:
>>    
>>> Hi everybody!
>>>
>>> Yet another simple and mysterious problem: with the "import" statement,
>>> running the code will generate a "Exception in thread "main"
>>> java.lang.NoSuchMethodError: main". Removing the "import" solves the
>>> problem. What am I missing? Changing the name of the object does not
>>> modify
>>> the outcome. Thanks!
>>>
>>> import java.sql._ // remove this line to get rid of the error msg
>>>
>>> object Sqltest {
>>> def main(args: Array[String]) {
>>>  print("OK")
>>> }
>>> }
>>>
>>>
>>>  
>>>      
>> --
>> Tony Morris
>> http://tmorris.net/
>>
>>
>>
>>
>>    
>
>  

--
Tony Morris
http://tmorris.net/

[Daniel Sobral]

In that case, maybe  this will help as well:

import java.sql.{Array=>SQLArray, _}

On Wed, Jul 8, 2009 at 8:55 PM, turicum <turicum@...> wrote:

thank you for the prompt reply!
everything's fine now :)
Alex

Tony Morris-4 wrote:
>
> I shan't spoil it for you, but I shall give ye a hint.
>
> When one alters Array for the word scala.Array then all is well.
>
> turicum wrote:
>> Hi everybody!
>>
>> Yet another simple and mysterious problem: with the "import" statement,
>> running the code will generate a "Exception in thread "main"
>> java.lang.NoSuchMethodError: main". Removing the "import" solves the
>> problem. What am I missing? Changing the name of the object does not
>> modify
>> the outcome. Thanks!
>>
>> import java.sql._ // remove this line to get rid of the error msg
>>
>> object Sqltest {
>>      def main(args: Array[String]) {
>>        print("OK")
>>      }
>> }
>>
>>
>>
>
> --
> Tony Morris
> http://tmorris.net/
>
>
>
>

--
View this message in context: http://www.nabble.com/dangerous-import-java.sql._-tp24401377p24401516.html

Sent from the Scala - User mailing list archive at Nabble.com.

--
Daniel C. Sobral

Something I learned in academia: there are three kinds of academic reviews: review by name, review by reference and review by value.

[Andrew Gaydenko]

java.sql package includes Array interface. I think, with importing you
overwrite scala.Array. Ar a result, you have, in fact,

def main(args: java.sql.Array[String])

instead of

def main(args: scala.Array[String])

As far as main's signature is not expected for legal 'main' method, you get
java.lang.NoSuchMethodError.


On Thursday 09 July 2009 03:55:10 turicum wrote:

> thank you for the prompt reply!
> everything's fine now :)
> Alex
>
> Tony Morris-4 wrote:
> > I shan't spoil it for you, but I shall give ye a hint.
> >
> > When one alters Array for the word scala.Array then all is well.
> >
> > turicum wrote:
> >> Hi everybody!
> >>
> >> Yet another simple and mysterious problem: with the "import" statement,
> >> running the code will generate a "Exception in thread "main"
> >> java.lang.NoSuchMethodError: main". Removing the "import" solves the
> >> problem. What am I missing? Changing the name of the object does not
> >> modify
> >> the outcome. Thanks!
> >>
> >> import java.sql._ // remove this line to get rid of the error msg
> >>
> >> object Sqltest {
> >> def main(args: Array[String]) {
> >>  print("OK")
> >> }
> >> }
> >
> > --
> > Tony Morris
> > http://tmorris.net/

[Andrew Gaydenko]

On Thursday 09 July 2009 03:59:43 Daniel Sobral wrote:
> In that case, maybe  this will help as well:
> import java.sql.{Array=>SQLArray, _}

.. or full qualifying scala.Array type in main's parameters list.

[Ricky Clarkson]

I'd suggest not using _ in imports.

2009/7/9 Andrew Gaydenko <a@...>:
> On Thursday 09 July 2009 03:59:43 Daniel Sobral wrote:
>> In that case, maybe  this will help as well:
>> import java.sql.{Array=>SQLArray, _}
>
> .. or full qualifying scala.Array type in main's parameters list.
>
>



--
Ricky Clarkson
Java Programmer, AD Holdings
[phone]
Skype: ricky_clarkson
Google Talk: ricky.clarkson@...

[Andrew Gaydenko]

On Thursday 09 July 2009 13:29:26 Ricky Clarkson wrote:
> I'd suggest not using _ in imports.

+1 to my taste (going from avoiding * in Java).


>
> 2009/7/9 Andrew Gaydenko <a@...>:
> > On Thursday 09 July 2009 03:59:43 Daniel Sobral wrote:
> >> In that case, maybe  this will help as well:
> >> import java.sql.{Array=>SQLArray, _}
> >
> > .. or full qualifying scala.Array type in main's parameters list.