Re: [Jscheme-user] use of addClasspathUrl

[Timothy J. H. <tim...@ma...>]

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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