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Re: Why Doesn't my Code Work with this Jar File?

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On Nov 2, 4:13 am, Arved Sandstrom <asandstrom3min...@eastlink.ca>
wrote:
> On 11-11-01 11:14 PM, Arne Vajhøj wrote:
>
>
>
> > On 11/1/2011 7:59 PM, Lew wrote:
> >> Arved Sandstrom wrote:
> >>> KevinSimonson wrote:
> >>>> I'm having a nasty time figuring out how to use JAR files.  I have a
> >>>> directory "Jrs" that includes an "abc" directory and a "def"
> >>>> directory.  In directory "abc" I have a single file called
> >>>> "AbcCl.java" coded:
>
> >>>> package abc;
> >>>> public class AbcCl
> >>>> {
> >>>>    public String toString ()
> >>>>    {
> >>>>      return "[AbcCl Object]";
> >>>>    }
> >>>> }
>
> >>>> and in directory "def" I have a single file called "DefCl.java" coded:
>
> >>>> package def;
> >>>> public class DefCl
> >>>> {
> >>>>    public String toString ()
> >>>>    {
> >>>>      return "[DefCl Object]";
> >>>>    }
> >>>> }
>
> >>>> Back in "Jrs" I have a file "UseEm.java" coded:
>
> >>>> import abc.AbcCl;
> >>>> import def.DefCl;
>
> >>>> public class UseEm
> >>>> {
> >>>>    public static void main ( Strin[] arguments)
> >>>>    {
> >>>>      AbcCl ac = new AbcCl();
> >>>>      DefCl dc = new DefCl();
> >>>>      System.out.println( "ac == " + ac + ", dc == " + dc + '.');
> >>>>    }
> >>>> }
>
> >>>> Then I executed "javac UseEm.java", which created three class files,
> >>>> an "abc\AbcCl.class", a "def\DefCl.class", and a "UseEm.java".
> >>>> Finally I created two jar files with commands "jar -cf abc.jar abc"
> >>>> and "jar -cf def.jar def".
>
> >>>> Then I created a "Jrs2" directory, a sibiling to "Jrs", and copied to
> >>>> it "UseEm.java" and the two JAR files.  In that "Jrs2" directory I
> >>>> typed in the command "javac -cp abc.jar:def.jar", and as a result got
> >>>> a whole bunch of error messages.  I was kind of expecting that.
>
> >>>> At that point I typed in "jar -xf abc.jar" which extracted the "abc"
> >>>> directory, and I thought that therefore I should be able to compile
> >>>> "UseEm.java" with the command "javac -cp .:def.jar UseEm.java".  But
> >>>> when I tried it I got error messages:
> >>> [ SNIP ]
>
> >>>> 6 errors
>
> >>>> Does anybody have any idea what I'm doing wrong?  Why can't I get the
> >>>> code I need to compile out of this JAR file?  And _why in the world_
> >>>> can't my compiler see the<AbcCl>  class?  The "abc" directory is
> >>>> _right there_, with an "AbcCl.class" and an "AbcCl.java" file right in
> >>>> it?
>
> >>> With the exception of the manual typo in UseEm.java, the only thing
> >>> wrong with your procedure is that you should also have supplied '.' as
> >>> part of the classpath on your first javac attempt with the JARs
> >>> (otherwise javac doesn't know where UseEm.java is). But that absolutely
> >>> should have worked.
>
> >>> I know it should have because I just now did it. I always do just to
> >>> make sure there's nothing catching me out in a question. The only
> >>> difference is that I don't include *.java files in JARs.
>
> >>> Side note: 'jar' does not need a hyphen in front of its arguments, and
> >>> never has.
>
> >> As another side note, do not mix classes that are in packages with
> >> classes that are not.
>
> > When one is ready to build jar files, then it may be time to drop
> > default package completely.
>
> > Arne
>
> That's good advice for the OP. I don't use the default package either.
>
> In this case, though, with the imported classes being in named packages,
> various quirks of the default package do not interfere with compiling
> and running the OP's example. Hence it would be interesting to find out
> what is causing the OP's problem.
>
> AHS
> --
> You should know the problem before you try to solve it.
> Example: When my son was three he cried about a problem with his hand. I
> kissed it several times and asked him about the problem. He peed on his
> hand.
> -- Radia Perlman, inventor of spanning tree protocol- Hide quoted text -
>
> - Show quoted text -

Somebody on another forum helped me see the problem.  I'm working on a
Windows 7 machine, so I should have been delimiting my classpath with
semicolons, not colons!  I replaced the colons with semicolons and
everything worked just fine.

Kevin Simonson

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Thread

Why Doesn't my Code Work with this Jar File? KevinSimonson <kvnsmnsn@hotmail.com> - 2011-11-01 10:39 -0700
  Re: Why Doesn't my Code Work with this Jar File? markspace <-@.> - 2011-11-01 11:23 -0700
  Re: Why Doesn't my Code Work with this Jar File? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-11-01 20:21 -0300
    Re: Why Doesn't my Code Work with this Jar File? Lew <lewbloch@gmail.com> - 2011-11-01 16:59 -0700
      Re: Why Doesn't my Code Work with this Jar File? Arne Vajhøj <arne@vajhoej.dk> - 2011-11-01 22:14 -0400
        Re: Why Doesn't my Code Work with this Jar File? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-11-02 07:13 -0300
          Re: Why Doesn't my Code Work with this Jar File? KevinSimonson <kvnsmnsn@hotmail.com> - 2011-11-02 16:44 -0700
            Re: Why Doesn't my Code Work with this Jar File? markspace <-@.> - 2011-11-02 18:16 -0700
          Re: Why Doesn't my Code Work with this Jar File? Arne Vajhøj <arne@vajhoej.dk> - 2011-11-02 20:00 -0400
  Re: Why Doesn't my Code Work with this Jar File? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 00:47 -0700
  Re: Why Doesn't my Code Work with this Jar File? Roedy Green <see_website@mindprod.com.invalid> - 2011-11-03 00:50 -0700

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