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

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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.

-- 
Lew

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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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