Re: [Jscheme-user] use of addClasspathUrl

[Geoffrey K. <ge...@kn...>]

Great detective work!  Thanks!

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

On Mar 31, 2005, at 08:33, Timothy John Hickey wrote:

> Hi Geoffrey,
>
> Luckily this has one has an easy solution.
> The addClasspathUrl is working fine, the problem was that
> the class you were interested in had a private constructor...
> Details below ...
>
>> On Mar 31, 2005, at 7:08 AM, Geoffrey Knauth wrote:
>>
>>> I'm puzzled.  This code works in one app:
>>>
>>> > (load "elf/jdbc.scm")
>>> > (load "elf/classpath.scm")
>>> > (addClasspathUrl "csvdriver.jar")
>>> > (DriverManager.registerDriver (jstels.jdbc.csv.CsvDriver.))
>>> StelsCSV JDBC Driver 2.1 (Trial version)
>>> $4 = #null
>>>
>>> But this code does not in another:
>>>
>>> > (load "elf/classpath.scm")
>>> > (addClasspathUrl "lava3-printf.jar")
>>> > com.sharkysoft.printf.Printf
>>> SchemeException: ERROR: undefined variable 
>>> "com.sharkysoft.printf.Printf"
>
> There are two problems with the code that doesn't work:
> 1) com.sharkysoft.printf.Printf   needs a "." after it so that it 
> becomes a javadot constructor
>  2) this Printf class has a private constructor, so if you want to 
> access the constructor you
>     you need to add a "#" after the "."
>
>> tim% java -jar jscheme.jarJScheme 7.2 (3/7/05 2:23 PM) 
>> http://jscheme.sourceforge.net
>> > (load "elf/classpath.scm")
>> $1 = #t
>>
>> > (addClasspathUrl "lava3-printf.jar")
>> $2 = #null
>>
>> > com.sharkysoft.printf.Printf.#
>> $3 = {jsint.JavaConstructor com.sharkysoft.printf.Printf[0]}
>>
>> > com.sharkysoft.print.Printf.
>> SchemeException: ERROR: undefined variable 
>> "com.sharkysoft.print.Printf."
>>         at jsint.E.error(E.java:14)
>>         at jsint.E.error(E.java:19)
>>         at 
>> jsint.DynamicVariable.getDynamicValue(DynamicVariable.java:27)
>>         at jsint.Evaluator.execute(Evaluator.java:361)
>>         at jsint.Evaluator.eval(Evaluator.java:283)
>>         at jsint.Evaluator.eval(Evaluator.java:272)
>>         at jsint.Evaluator.readEvalWriteLoop(Evaluator.java:129)
>>         at jsint.Evaluator.runJscheme(Evaluator.java:106)
>>         at jsint.Scheme.runJscheme(Scheme.java:170)
>>         at jsint.Scheme.defaultMain(Scheme.java:134)
>>         at jsint.Scheme.main(Scheme.java:109)
>>         at jscheme.REPL.main(REPL.java:156)
>> > (exit).
>> $4 = #t
>>
>> [dsl092-074-053:~/Desktop/jschemetest/demo] tim%
>>
>
> You can see that it has a private constructor using the
> (describe CLASSNAME) procedure ...
>
>> > (load "elf/basic.scm")
>> $3 = #t
>>
>> > (describe com.sharkysoft.printf.Printf.class)
>> class: class com.sharkysoft.printf.Printf
>> public final class com.sharkysoft.printf.Printf extends 
>> java.lang.Object
>> HashCode: 6584281
>> ClassLoader: sun.misc.Launcher$AppClassLoader@c2391a
>> Package: package com.sharkysoft.printf
>> Name: "com.sharkysoft.printf.Printf"
>>
>> // Constructors
>>   private Printf()
> ********* Note the private constructor here!!
>>
>> // Fields
>> // Methods
>>   // from java.lang.Object
>>   public native int hashCode()
>>   public final native Class getClass()
>>   public boolean equals(Object)
>>   public String toString()
>>   protected void finalize()
>>   protected native Object clone()
>>   public final void wait(long, int)
>>   public final native void wait(long)
>>   public final void wait()
>>   private static native void registerNatives()
>>   public final native void notify()
>>   public final native void notifyAll()
>>
>>   // from com.sharkysoft.printf.Printf
>>   public static int out(String, Object[])
>>   public static int out(PrintfTemplate, Object[])
>>   public static int out(String, PrintfData)
>>   public static int out(String)
>>   public static int write(Writer, String, Object[])
>>   public static int write(Writer, String, PrintfData)
>>   public static int write(Writer, String)
>>   public static int write(Writer, PrintfTemplate, Object[])
>>   public static String format(String)
>>   public static String format(PrintfTemplate, Object[])
>>   public static String format(String, Object[])
>>   public static String format(String, PrintfData)
>>
>> $4 = #t
>
> Cheers,
> ---Tim---
>
>
>>>
>>> In both cases the .jar file in question is in the same directory as 
>>> the .scm file (for testing).
>>>
>>> StelsCSV (trial version) came from:  http://www.csv-jdbc.com/
>>> Lava3 Printf came from:  
>>> http://sharkysoft.com/software/java/lava3/printf/
>>>
>>> Geoffrey
>>> --
>>> Geoffrey S. Knauth | http://knauth.org/gsk
>>>
>>>
>>>
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>
>
>
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