Re: Running java programs from class files

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 30 Aug 2006 12:21:22 -0700
Message-ID:
<SxlJg.234$Xl7.27@newsfe11.phx>
Andrew Thompson wrote:

Knute Johnson wrote:

Babu Kalakrishnan wrote:

Knute Johnson wrote:

Oliver Wong wrote:

"Knute Johnson" <nospam@rabbitbrush.frazmtn.com> wrote in message
news:qe%Ig.2$bR.0@newsfe06.phx...

Babu Kalakrishnan wrote:

The commandline for the above example in that case would be :

java -classpath /xyz/abc MyPackage.MyClass


That doesn't work for me although I have seen reference to it before
like that. Could it be that it doesn't work on Windows like that?

   It works for me on WinXP SP2:

java -cp "D:\Oliver's Documents\Workspace\Test\bin" D

   to run a class called "D" with no package whose classfile is in
"D:\Oliver's Documents\Workspace\Test\bin"

   - Oliver

That does for me too. But put it in a package and it won't.


Interesting - Seems to work for me even with classes within a package -

Running TCPServer.class in package test :

java -classpath "C;\Documents and
Settings\Babu\workspace\TestServer\classes" test.TCPServer
Main: Listening for connections on port 2345

Testing on XP Home SP2

...

package test;

public class Test {
     public static void main(String[] args) {
         System.out.println("It works!");
     }
}

C:\>javac test/Test.java

C:\>java test.Test
It works!

C:\>cd test

C:\test>java -cp "C:\test" test.Test
Exception in thread "main" java.lang.NoClassDefFoundError: test/Test


Here you need to add the 'test' package to the classpath,
as opposed to ..anything it contains.

So on my system -

C:\test>java -cp .. test.Test
It works!

___

Note that in your original post, there was a *slight* wording
mistake (AFAIU). I did not point it out at the time, since I
felt the OP had enough to mull over, but since I've jumped
into this thread..

Initially you said that a test.Test dould be run from the
'parent directory'.. OK that *is* correct, but I feel it would
have been better to say that it could be run from the
'root of the package structure'.

In your example, of course, they *are* the same place.

BUT.. if you consider the class test.junit.Test,
the latter advice is correct, while the 'parent' directory
of the test.junit.Test class is also a package, rather
than the 'root' and will not work (in the same way).

Andrew T.


Andrew:

Thanks very much. Please see my response to Babu (and you).

--

Knute Johnson
email s/nospam/knute/

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